Natural Resources
Conservation Service
Ecological site R058DY011SD
Clayey
Last updated: 7/18/2024
Accessed: 11/21/2024
General information
Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.
Figure 1. Mapped extent
Areas shown in blue indicate the maximum mapped extent of this ecological site. Other ecological sites likely occur within the highlighted areas. It is also possible for this ecological site to occur outside of highlighted areas if detailed soil survey has not been completed or recently updated.
MLRA notes
Major Land Resource Area (MLRA): 058D–Northern Rolling High Plains, Eastern Part
The Northern Rolling High Plains, Eastern Part (MLRA 58D) is shared between South Dakota (65 percent), Montana (21 percent), and North Dakota (14 percent). The MLRA is approximately 2,755 square miles. The small towns of Buffalo and Camp Crook, South Dakota, and Marmarth, North Dakota, are all within the boundary of this MLRA, and Baker, Montana, is on the northern most edge. Portions of the Little Missouri National Grassland and Custer National Forest are also in the MLRA. Portions of the Little Missouri River and the headwaters of major tributaries that eventually form the Grand and Moreau Rivers in South Dakota are also in this area.
The Northern Rolling High Plains, Eastern Part consists of Cretaceous marine and continental sediments of shale, siltstone, and sandstone. The continental and marine Hell Creek Formation is under approximately 85 percent of the MLRA, and the Fox Hills Sandstone forms the southern boundary of the MLRA. Tertiary deposits are in scattered areas throughout the MLRA. These deposits consist of the Paleocene Ludlow and Tongue River Formations, the Oligocene White River Group, and the Miocene Arikaree Group. These Tertiary deposits are resistant and positioned above the Cretaceous beds. Ponderosa pine growing in areas of these Tertiary formations further distinguishes these formations from the other formations in the MLRA. Pleistocene and Holocene river sand and gravel deposits are also on the valley floors and on the terraces along the larger rivers in the area. A large Quaternary eolian deposit is directly south of the town of Buffalo.
The average elevation of MLRA 58D ranges from 2,300 feet to 4,000 feet, increasing gradually from east to west. Harding Peak is the highest point at 4,019 feet. In places, flat-topped, steep-sided buttes rise sharply above the gently rolling plains below.
The dominant soil orders in this MLRA are Alfisols, Entisols, Inceptisols, and Mollisols. The soils in the area dominantly have a frigid soil temperature regime, an ustic soil moisture regime that borders on aridic, and mixed mineralogy. They are shallow to very deep, generally well drained, and loamy or clayey.
Annual precipitation is 14 to 17 inches and can fluctuate widely from year to year. Most rainfall occurs early in the growing season. Some high-intensity thunderstorms occur mid to late summer. The native vegetation in this MLRA consists primarily of grasses and forbs with a small component of trees and shrubs along streams. Ponderosa pine grow on the upper slopes and on the top of some of the higher buttes. Open grasslands are characterized by western wheatgrass, green needlegrass, blue grama, and buffalograss. Wyoming big sagebrush grows on clayey soils in the western part of the MLRA.
More than four-fifths of the MLRA is privately owned ranches running cattle, sheep, or both. Less than 5 percent of the area is federally owned. The major resource concerns are water quality, wind erosion, and water erosion (USDA, NRCS. 2006. Ag Handbook 296).
Classification relationships
USDA
Land Resource Region G—Western Great Plains Range and Irrigated Region:
Major Land Resource Area (MLRA) 58D—Northern Rolling High Plains, Eastern Part.
US Environmental Protection Agency (EPA)
Level IV Ecoregions of the Conterminous United States:
Northwestern Great Plains—43:
Forested Buttes—43d.
Sagebrush Steppe—43e.
USDA Forest Service
Ecological Subregions: Sections and Subsections of Conterminous United States:
Great Plains - Palouse Dry Steppe Province—331:
Missouri Plateau Section—331M.
Sagebrush Steppe Subsection—334Mi.
Ecological site concept
The Clayey ecological site is found throughout MLRA 58D. It is located on upland landscapes and does not receive additional moisture from runoff or overflow. Typical slopes range from 0 to 6 percent. Soils are deep (greater than 20 inches) with a silty clay loam surface textures and 5 to 6 inches thick.
The vegetation in the Reference State consists of a mix of cool- and warm-season grasses; however, mid-statured cool-season grasses will be the dominant group. Western wheatgrass and green needlegrass are the dominant cool-season grasses, while buffalograss, blue grama, and sideoats grama are the dominant warm-season grasses. Forbs are common and diverse. Shrubs include winterfat, silver sagebrush, Gardner’s saltbush, and rose. Wyoming big sagebrush may also be found in this site, especially on the western side of the MLRA.
Associated sites
| R058DY013SD |
Claypan The Claypan ecological site is found adjacent to the Clayey ecological site. |
|---|---|
| R058DY015SD |
Thin Claypan The Thin Claypan ecological site is be found adjacent to the Clayey ecological site. |
Similar sites
| R058DY013SD |
Claypan The Claypan ecological site will have more blue grama, and cactus, and less vegetative production than the Clayey ecological site. |
|---|---|
| R058DY015SD |
Thin Claypan The Thin Claypan ecological site will have less western wheatgrass, more blue grama and less vegetative production than the Clayey ecological site. |
Table 1. Dominant plant species
| Tree |
Not specified |
|---|---|
| Shrub |
Not specified |
| Herbaceous |
(1) Pascopyrum smithii |
Physiographic features
The Clayey ecological site occurs on nearly level to moderately steep uplands.
Table 2. Representative physiographic features
| Landforms |
(1)
Hill
(2) Plain (3) Terrace |
|---|---|
| Runoff class | High to very high |
| Flooding frequency | None |
| Ponding frequency | None |
| Elevation | 2,300 – 4,000 ft |
| Slope | 6% |
| Water table depth | 80 in |
| Aspect | Aspect is not a significant factor |
Climatic features
The climate in MLRA 58D is typical of the drier portions of the Northern Great Plains where sagebrush steppes to the west yield to grassland to the east. Average annual precipitation ranges from 14 to 17 inches with most falling in the early growing season. Some high intensity, convective thunderstorms occur in the summer. Precipitation in winter occurs as snow. Temperatures show a wide range between summer and winter and between daily maximums and minimums. This wide range is due to the high elevation and dry air, which permit rapid incoming and outgoing radiation. Outbreaks of cold air from Canada in winter move rapidly from northwest to southeast and account for extreme minimum temperatures. Extreme storms may occur during the winter but have the most severe effect on ranching operations during late winter and in spring.
The normal average annual temperature is about 44 °F. January is the coldest month with average temperatures ranging from about 12 °F (Marmarth, North Dakota) to about 20 °F (Baker, Montana). July is the warmest month with temperatures averaging from about 70 °F (Marmarth, North Dakota) to about 76 °F (Baker, Montana). The range of normal average monthly temperatures between the coldest and warmest months is about 55 °F. Wind speeds are estimated to average about 11 miles per hour (mph) annually, ranging from about 13 mph during the spring to about 10 mph during the summer. Daytime winds are generally stronger than nighttime winds. Strong storms may bring brief periods of high winds with gusts of more than 50 mph.
Growth of cool-season plants begins in early to mid-March, slowing or ceasing in late June. Warm-season plants begin growth about mid-May and continue to early or mid-September. Cool-season plants may green-up in September and October if adequate soil moisture is present.
Table 3. Representative climatic features
| Frost-free period (characteristic range) | 97-111 days |
|---|---|
| Freeze-free period (characteristic range) | 121-129 days |
| Precipitation total (characteristic range) | 15-17 in |
| Frost-free period (actual range) | 93-115 days |
| Freeze-free period (actual range) | 120-132 days |
| Precipitation total (actual range) | 14-17 in |
| Frost-free period (average) | 104 days |
| Freeze-free period (average) | 125 days |
| Precipitation total (average) | 16 in |
Figure 2. Monthly precipitation range
Figure 3. Monthly minimum temperature range
Figure 4. Monthly maximum temperature range
Figure 5. Monthly average minimum and maximum temperature
Figure 6. Annual precipitation pattern
Figure 7. Annual average temperature pattern
Climate stations used
-
(1) BAKER 1 E [USC00240412], Baker, MT
-
(2) LADNER 9SW [USC00394671], Camp Crook, SD
-
(3) CAMP CROOK [USC00391294], Camp Crook, SD
-
(4) BUFFALO 13 ESE [USW00094081], Reva, SD
-
(5) REDIG 11 NE [USC00397062], Buffalo, SD
-
(6) HOOVER [USC00393945], Newell, SD
-
(7) BUFFALO ASOS [USW00094037], Buffalo, SD
Influencing water features
No significant water features influence the Clayey ecological site.
Soil features
Soils common to the Clayey ecological site have silty clay loam textured surface layer that is 5 to 6 inches thick. Soils are formed in alluvium and residuum derived from shale and siltstone. The texture of the subsurface layer’s ranges from silty clay loam to clay. The soils in this site are well drained and have a slow infiltration rate. When dry these soils crack. Wet surface compaction can occur with heavy traffic. Subsurface soil layers are nonrestrictive to water movement and root penetration.
This site typically should show slight to no evidence of rills, wind-scoured areas, or pedestalled plants.
Water flow paths are broken, irregular in appearance, or discontinuous. The soil surface is stable and
intact.
Major Soil correlated to the Clayey ecological site include, Belfield, Lawther, Moreau, Regent, Savage, and Tanna.
The hazard of water erosion increases on slopes greater than about 5 percent. Loss of 50 percent or more of the surface layer of the soils on this site can result in a shift in species composition and vegetative production.
More information can be found in the various soil survey reports. Contact the local USDA Service Center for soil survey reports that include more detail specific to your area of interest, or use the internet to access USDA’s Web Soil Survey.
Table 4. Representative soil features
| Parent material |
(1)
Alluvium
–
shale and siltstone
(2) Residuum – shale and siltstone |
|---|---|
| Surface texture |
(1) Silty clay loam |
| Family particle size |
(1) Clayey |
| Drainage class | Well drained |
| Permeability class | Very slow |
| Soil depth | 20 – 80 in |
| Surface fragment cover <=3" | 10% |
| Surface fragment cover >3" | 5% |
| Available water capacity (0-40in) |
5 – 7 in |
| Calcium carbonate equivalent (0-40in) |
3% |
| Electrical conductivity (0-40in) |
4 mmhos/cm |
| Sodium adsorption ratio (0-40in) |
Not specified |
| Soil reaction (1:1 water) (0-40in) |
6.1 – 8.4 |
| Subsurface fragment volume <=3" (Depth not specified) |
10% |
| Subsurface fragment volume >3" (Depth not specified) |
5% |
Ecological dynamics
The Clayey ecological site developed under the Northern Great Plains climatic conditions; light to severe grazing by bison and other large herbivores; sporadic, natural or human-caused wildfire (often of light intensities); and other biotic and abiotic factors that typically influence soil and site development. Changes occur in the plant communities due to short-term weather variations, effects of native and exotic plant and animal species, and management actions. Although the following plant community descriptions are typical of the transitions between communities, severe disturbances, such as periods of well below average precipitation and the introduction of non-native cool-season grasses, can cause significant shifts in plant communities and species composition.
The western portion of MLRA 58D is located in the eastern extent of Wyoming big sagebrush range. Wyoming big sage is an important habitat element for may obligate species, including the greater sage-grouse. It is also essential to maintaining native plants and limiting the invasion of exotic plants in sagebrush communities (Beck et al., 2010).
Wyoming big sagebrush distribution in the northern Great Plains is limited by the relative lack of winter precipitation and relatively greater summer precipitation that favors grass growth. Snow accumulation and spring snowmelt are important in sagebrush ecosystems for recharging moisture deep in the soil profile, even on warm, dry sites (Innes, Robin J. 2019).
Wyoming big sagebrush recovery is extremely slow following wildfire. It is a non-root sprouter and highly susceptible to fire injury and is likely to require well over 100 years to reach pre-burn sagebrush cover (Cooper et al., 2001).
The plant community upon which interpretations are primarily based is the Western Wheatgrass-Green Needlegrass Plant Community (1.1). This plant community has been determined by studying rangeland relic areas, areas protected from excessive disturbance, and areas under long-term rotational grazing regimes. Trends in plant community dynamics ranging from heavily grazed to lightly grazed areas, seasonal use pastures, and historical accounts also have been used. Plant communities, states, transitional pathways, and thresholds have been determined through similar studies and experience.
Heavy continuous grazing or continuous seasonal (spring) grazing, without adequate recovery periods following each grazing occurrence causes this site to depart from the Western Wheatgrass-Green Needlegrass Plant Community (1.1). Blue grama will begin to increase. Western wheatgrass will increase initially and then begin to decrease. Green needlegrass will decrease in frequency and production. In time, heavy continuous grazing will likely cause upland sedges and blue grama to dominate and clubmoss to increase. This resulting plant community is relatively stable, and the competitive advantage prevents other species from establishing. This plant community is less productive than the Western Wheatgrass-Green Needlegrass Plant Community. Runoff increases and infiltration will decrease. Soil erosion will be minimal.
Extended periods of nonuse and lack of fire will result in a plant community having high litter levels,
which favors an increase in Kentucky bluegrass and smooth brome. Shrubs such as western snowberry and silver sagebrush may also increase.
Historically, mechanical treatment was an option to improve forage production and plant species composition on rangeland on this site when the plant community became sod-bound. Mechanical treatments included contour furrowing, contour pitting, terracing, chiseling, and disking. These treatments were used to break up a sod-bound vegetative condition or compacted soils, resulting in less runoff and better infiltration. Many of these treatments were implemented from the 1930s through the 1970s but have not shown to have real long-term benefits for improving production. The lack of benefit is primarily due to improper grazing management following the renovation practice. Another drawback, in addition to the cost, is the practices result in a near permanently roughened ground surface.
The following state-and-transition diagram illustrates the common plant communities on the site and the transition pathways between communities. The ecological processes are discussed in more detail in the plant community descriptions following the diagram.
State and transition model
More interactive model formats are also available.
View Interactive Models
Click on state and transition labels to scroll to the respective text
Ecosystem states
States 1, 5 and 2 (additional transitions)
State 2 submodel, plant communities
State 3 submodel, plant communities
State 5 submodel, plant communities
State 1
Reference State
The Reference State (1.0) represents what is believed to show the natural range of variability that dominated the dynamics of the ecological site prior to European settlement. This site in the Reference State (1.0) is dominated by cool-season grasses. In pre-European times, the primary disturbance mechanisms included frequent fire and grazing by large herding ungulates. Timing of fires and grazing coupled with weather events dictated the dynamics that occurred within the natural range of variability. Taller cool-season wheatgrasses and needlegrasses would have declined and a corresponding increase in short statured grass and grass-like species would have occurred. Today, a similar state can be found on areas that are properly managed with grazing and sometimes on areas receiving occasional short periods of rest.
Dominant plant species
-
prairie sagewort (Artemisia frigida), shrub
-
big sagebrush (Artemisia tridentata), shrub
-
western snowberry (Symphoricarpos occidentalis), shrub
-
silver sagebrush (Artemisia cana), shrub
-
rose (Rosa), shrub
-
western wheatgrass (Pascopyrum smithii), grass
-
green needlegrass (Nassella viridula), grass
-
blue grama (Bouteloua gracilis), grass
-
sideoats grama (Bouteloua curtipendula), grass
-
prairie Junegrass (Koeleria macrantha), grass
-
buffalograss (Bouteloua dactyloides), grass
-
sedge (Carex), grass
-
American vetch (Vicia americana), other herbaceous
-
white sagebrush (Artemisia ludoviciana), other herbaceous
-
dotted blazing star (Liatris punctata), other herbaceous
-
white prairie aster (Symphyotrichum falcatum), other herbaceous
-
purple prairie clover (Dalea purpurea), other herbaceous
Community 1.1
Western Wheatgrass-Green Needlegrass
The interpretive plant community for this site is the Western Wheatgrass-Green Needlegrass Plant Community. This is also considered to be Reference Plant Community (1.1). This plant community can be found on areas that are properly managed with grazing and/or prescribed burning, and sometimes on areas receiving occasional short periods of deferment. The potential vegetation is about 85 percent grasses or grass-like plants, 10 percent forbs, 5 percent shrubs, and 0 to 1 percent mat-forming forbs. Cool-season grasses dominate this plant community. The major grasses include western wheatgrass and green needlegrass. Other grasses or grass-like species occurring on the site include blue grama, sideoats grama, prairie Junegrass, buffalograss, and upland sedge. Significant forbs include American vetch, cudweed sagewort, dotted gayfeather, white prairie aster, and purple prairie clover. The significant shrubs that occur include fringed sagewort, big sagebrush, snowberry, silver sagebrush, and rose. This plant community is well adapted to the Northern Great Plains climatic conditions. Individual species can vary greatly in production depending on growing conditions (timing and amount of precipitation and temperature). The diversity in plant species allows for high drought tolerance. This is a healthy and sustainable plant community. Moderate or high available water capacity provides a favorable soil-water-plant relationship. Overall, the interpretive plant community has the appearance of being stable, diverse, and productive. Plant litter is properly distributed with very little movement offsite and natural plant mortality is very low.
Figure 8. Annual production by plant type (representative values) or group (midpoint values)
Table 5. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 1120 | 1606 | 2190 |
| Shrub/Vine | 90 | 142 | 195 |
| Forb | 90 | 142 | 195 |
| Moss | 0 | 10 | 20 |
| Total | 1300 | 1900 | 2600 |
Figure 9. Plant community growth curve (percent production by month). SD5801, Northern Rolling High Plains, cool-season dominant.. Cool-season dominant, uplands..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 4 | 12 | 25 | 36 | 10 | 5 | 4 | 4 | 0 | 0 |
Community 1.2
Buffalograss-Blue Grama-Western Wheatgrass
This plant community develops under continuous seasonal grazing (i.e., grazing an area during the same season every year); or continuous season-long grazing; or from over utilization during extended drought periods. The potential vegetation is made up of approximately 85 percent grasses and grass-like species, 10 percent forbs, 5 percent shrubs, and 0 to 3 percent mat-forming forbs. The dominant grasses include buffalograss, blue grama and western wheatgrass. Other grasses or grass-like species may include sedge, green needlegrass, and prairie Junegrass. Significant forbs include cudweed sagewort, scurfpea, white prairie aster, and western yarrow. The dominant shrubs that occur include fringed sagewort, western snowberry, and cactus. Compared to the Western Wheatgrass-Green Needlegrass Plant Community (1.1), the shortgrass species including buffalograss, blue grama and sedge have increased. The cool-season species including western wheatgrass and green needlegrass have decreased in composition. Annual bromes, curlycup gumweed, sweetclover, and other annual grasses and forbs can invade the site. This plant community is somewhat resistant to change. The dominant herbaceous species are very adapted to grazing; however, the mid-grass species and the more palatable forbs will decrease. If the herbaceous component is intact, it tends to be resilient if disturbance is not long-term. Because of the sod forming habit of the shortgrass species, water infiltration is lower, and runoff is moderate to high. Typically, the runoff is very clean because of the low potential for onsite soil erosion. However, offsite areas may be affected by increased runoff.
Figure 10. Annual production by plant type (representative values) or group (midpoint values)
Table 6. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 590 | 1002 | 1510 |
| Forb | 55 | 90 | 125 |
| Shrub/Vine | 55 | 90 | 125 |
| Moss | 0 | 18 | 40 |
| Total | 700 | 1200 | 1800 |
Figure 11. Plant community growth curve (percent production by month). SD5803, Northern Rolling High Plains, cool-season/warm-season co-dominant.. Cool-season, warm-season co-dominant, uplands..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 3 | 10 | 20 | 28 | 21 | 10 | 5 | 3 | 0 | 0 |
Community 1.3
Big Sagebrush > 5% Cover/Western Wheatgrass-Green Needlegrass
This plant community develops from proper grazing use, the absence of fire, and an extended period of time. It is made up of 75 grasses and grass-like species, 10 percent forbs, 15 percent shrubs, and 1 to 3 percent mat-forming forbs. The dominant grasses include western wheatgrass, green needlegrass, blue grama, and buffalograss. Forbs commonly found on this plant community include cudweed sagewort, common yarrow, dotted gayfeather, and scurfpea. Wyoming big sagebrush canopy cover typically ranges from 1 to 8 percent. When compared to the Reference Plant Community (1.1), big sagebrush has increased. Production of cool-season grasses, particularly green needlegrass, has been reduced slightly. Annual brome, other annuals, and Kentucky bluegrass can invade the plant community. Under proper management, this plant community is stable and productive. The soil erosion is low to moderate. Infiltration and runoff are moderate. Snow catch by the big sagebrush can increase available soil moisture.
Figure 12. Annual production by plant type (representative values) or group (midpoint values)
Table 7. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 840 | 1240 | 1420 |
| Shrub/Vine | 165 | 298 | 450 |
| Forb | 80 | 128 | 175 |
| Moss | 15 | 34 | 55 |
| Total | 1100 | 1700 | 2100 |
Figure 13. Plant community growth curve (percent production by month). SD5802, Northern Rolling High Plains, cool-season dominant, warm-season subdominant. Cool-season dominant, warm-season subdominant..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 3 | 10 | 23 | 34 | 15 | 6 | 5 | 4 | 0 | 0 |
Pathway 1.1A
Community 1.1 to 1.2
Continuous seasonal grazing (early spring); continuous season-long grazing or grazing for extended periods during the actively growing period of the dominant grasses without adequate recovery periods; or heavy grazing in combination with drought will lead to the Reference Plant Community (1.1) to the Buffalograss-Blue Grama-Western Wheatgrass Plant Community (1.2).
Pathway 1.1B
Community 1.1 to 1.3
Prescribed grazing, including proper stocking rates, change in season of use, occasional deferment, no fire, and an extended period of time will lead the Western Wheatgrass-Green Needlegrass Plant Community (1.1) to the Big Sagebrush > 5% Cover/Western Wheatgrass-Green Needlegrass Plant Community (1.3).
Conservation practices
| Prescribed Grazing |
|---|
Pathway 1.2A
Community 1.2 to 1.1
Prescribed grazing with proper stocking rate, change in season of use, and adequate time for plant recovery; and a return to normal precipitation patterns following drought will convert the Buffalograss-Blue Grama-Western Wheatgrass Plant Community (1.2) to the Western Wheatgrass-Green Needlegrass Plant Community (1.1).
Conservation practices
| Prescribed Grazing |
|---|
Pathway 1.3A
Community 1.3 to 1.1
Fire or prescribed burning that creates a mosaic within the big sagebrush stand, or brush management that is designed to reduce, but not eliminate big sagebrush cover, followed by prescribed grazing, will move the Big Sagebrush > 5% Cover/Western Wheatgrass-Green Needlegrass Plant Community (1.3) toward the Western Wheatgrass-Green Needlegrass Plant Community (1.1).
Conservation practices
| Brush Management | |
|---|---|
| Prescribed Burning | |
| Prescribed Grazing |
Pathway 1.3B
Community 1.3 to 1.2
Fire, or brush management that removes most of the big sagebrush, followed by continuous season-long grazing, the Big Sagebrush > 5% Cover/Western Wheatgrass-Green Needlegrass Plant Community (1.3), will in time move to the Buffalograss-Blue Grama-Western Wheatgrass Plant Community (1.2).
Conservation practices
| Brush Management | |
|---|---|
| Prescribed Burning |
State 2
Shortgrass Sod State
The Shortgrass Sod State is dominated by shortgrass species, upland sedges and clubmoss. This State is the result of grazing management that did not provide adequate recovery time for cool-season wheatgrasses and green needlegrass. The hydrologic function of this state is dramatically altered. Runoff is high and infiltration is low. This State is very resistant to change through grazing management alone.
Dominant plant species
-
buffalograss (Bouteloua dactyloides), grass
-
blue grama (Bouteloua gracilis), grass
-
clubmoss (Lycopodiella), grass
-
western wheatgrass (Pascopyrum smithii), grass
-
prairie Junegrass (Koeleria macrantha), grass
-
cheatgrass (Bromus tectorum), grass
-
white sagebrush (Artemisia ludoviciana), other herbaceous
-
scurfpea (Psoralidium), other herbaceous
-
woolly plantain (Plantago patagonica), other herbaceous
-
common yarrow (Achillea millefolium), other herbaceous
-
prairie sagewort (Artemisia frigida), other herbaceous
-
yucca (Yucca), other herbaceous
Community 2.1
Buffalograss-Blue Grama/Clubmoss
This plant community develops under continuous season-long grazing, or with continuous seasonal grazing with concentrated use in the early part of the growing season (as in calving/lambing pastures). It is made up of approximately 80 percent grasses and grass-like species, 10 percent forbs, 5 percent shrubs, and 1 to 5 percent mat-forming forbs. The dominant grass grass-like species include buffalograss, blue grama and sedge. Other grasses may include western wheatgrass, prairie Junegrass, and cheatgrass. The dominant forbs include cudweed sagewort, scurfpea, woolly Indianwheat, and western yarrow. The dominant shrubs include fringed sagewort and cactus. Compared to the Western Wheatgrass-Green Needlegrass Plant Community (1.1), shortgrasses and sedge have increased, and the cool-season mid-grasses have diminished greatly. Non-palatable forbs and cactus have increased, and non-native species have invaded the site. Plant diversity is low. This plant community is very stable. Generally, this plant community will require significant management inputs (i.e., high animal impact, long-term prescribed grazing, favorable climatic conditions, etc.,) and time to move it towards the Buffalograss-Blue Grama-Western Wheatgrass Plant Community (1.2). Onsite soil erosion is low. Infiltration is low and runoff is high. Typically, the runoff is very clean because of the low potential for onsite soil erosion. However, offsite areas can be significantly impacted due to the increased runoff.
Figure 14. Annual production by plant type (representative values) or group (midpoint values)
Table 8. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 335 | 567 | 900 |
| Forb | 30 | 53 | 75 |
| Shrub/Vine | 30 | 53 | 75 |
| Moss | 5 | 27 | 50 |
| Total | 400 | 700 | 1100 |
Figure 15. Plant community growth curve (percent production by month). SD5804, Northern Rolling High Plains, warm-season dominant, cool-season sub-dominant.. Warm-season dominant, cool-season sub-dominant, uplands..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 3 | 7 | 18 | 24 | 25 | 15 | 7 | 1 | 0 | 0 |
State 3
Early Successional State
The Early Successional State (3.0) is dominated by weedy annuals, threeawn, wheatgrass, and pricklypear cactus. This State is the result of heavy disturbance such as frequent and severe defoliation, heavy livestock concentrations coupled with grazing management that does not provide adequate recovery time for cool-season wheatgrasses and green needlegrass. The hydrologic function is also likely to be dramatically altered. Runoff is high and infiltration is low. This State is very resistant to change through grazing management alone.
Dominant plant species
-
threeawn (Aristida), grass
-
field brome (Bromus arvensis), grass
-
blue grama (Bouteloua gracilis), grass
-
buffalograss (Bouteloua dactyloides), grass
-
sedge (Carex), grass
-
western wheatgrass (Pascopyrum smithii), grass
-
thickspike wheatgrass (Elymus lanceolatus), grass
-
sixweeks fescue (Vulpia octoflora), grass
-
prairie sagewort (Artemisia frigida), other herbaceous
-
fetid marigold (Dyssodia papposa), other herbaceous
-
Cuman ragweed (Ambrosia psilostachya), other herbaceous
-
pussytoes (Antennaria), other herbaceous
-
prostrate verbena (Verbena officinalis var. prostrata), other herbaceous
Community 3.1
Threeawn-Annual Grasses/Prickly Pear Cactus
This plant community develops under heavy, continuous season-long grazing and/or frequent and severe defoliation, and/or heavy disturbance such as livestock feeding areas. The potential plant community is made up of approximately 70 percent grasses and grass-like species, 25 percent forbs, and 5 percent shrubs. The dominant grasses include threeawn and annual brome grasses. Other grasses may include blue grama, buffalograss, sedges, western wheatgrass, thickspike wheatgrass, and sixweeks fescue. The dominant forbs include fringed sagewort, fetid marigold, western ragweed, pussytoes, prostrate verbena, and other annual invader-like species. Other plant species from adjacent ecological sites can become minor components of this plant community. This plant community is susceptible to invasion of Canada thistle and other non-native species because of the relatively high percentage of bare ground. Compared to the Western Wheatgrass-Green Needlegrass Plant Community (1.1), red threeawn, annual brome grasses, and the percentage of bare ground has increased. Wheatgrasses, needlegrasses, and other cool-season grasses and grass-like species have decreased, as have the warm-season species including sideoats grama, blue grama, and buffalograss. Many annual and perennial forbs, including native and non-native species, have invaded the site. This plant community is resistant to change back to a higher successional plant community because of the loss of plant diversity and overall soil disturbance. It is very susceptible to invasion of non-native plant species. The potential for soil erosion is very high because of the bare ground and shallow-rooted herbaceous plant community. Water runoff will increase, and infiltration will decrease due to animal-related soil compaction and loss of root mass due to low plant diversity and vigor. This plant community will require significant economic inputs and time to move toward another plant community. This movement is highly variable in its succession.
Figure 16. Plant community growth curve (percent production by month). SD5804, Northern Rolling High Plains, warm-season dominant, cool-season sub-dominant.. Warm-season dominant, cool-season sub-dominant, uplands..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 3 | 7 | 18 | 24 | 25 | 15 | 7 | 1 | 0 | 0 |
State 4
Native/Invaded State
This State is dominated by rhizomatous wheatgrass, green needlegrass, and non-native cool-season annual and perennial grasses. The Native/Invaded State can resemble the Reference State (1.0) in species composition and vegetative production except that it is invaded by non-native cool-season grasses. Big Sagebrush is unlikely to persist in this State (4.0) because of an increase in the fire potential due to annual brome grasses.
Dominant plant species
-
cheatgrass (Bromus tectorum), grass
-
field brome (Bromus arvensis), grass
-
smooth brome (Bromus inermis), grass
-
crested wheatgrass (Agropyron cristatum), grass
-
western wheatgrass (Pascopyrum smithii), grass
-
green needlegrass (Nassella viridula), grass
-
blue grama (Bouteloua gracilis), grass
-
buffalograss (Bouteloua dactyloides), grass
-
Kentucky bluegrass (Poa pratensis), grass
-
white sagebrush (Artemisia ludoviciana), other herbaceous
-
scarlet globemallow (Sphaeralcea coccinea), other herbaceous
-
common yarrow (Achillea millefolium), other herbaceous
-
scurfpea (Psoralidium), other herbaceous
Community 4.1
Western Wheatgrass-Green Needlegrass-Annual and Perennial Non-Native Cool-Season Grasses
This plant community will look much like the Reference Plant Community (1.1), other than the non-native cool-season annual and perennial grasses that have invaded the plant community. Cheatgrass, field brome, smooth brome, or crested wheatgrass will make up to 15 percent (by air-dry weight) of the species composition. Cool-season midgrasses will make up approximately 85 percent of the plant community, warm-season shortgrasses account for approximately 10 percent, and forbs and shrubs are about 5 percent. The dominant grasses include western wheatgrass, green needlegrass, annual bromegrass, blue grama, and buffalograss. Under long-term non-use, Kentucky bluegrass and smooth brome may become the dominant grass species. Forbs commonly found on this plant community include cudweed sagewort, scarlet globemallow, common yarrow, and scurfpea. Production in wet years may be very similar or slightly higher than the Reference Plant Community (1.1), but in dry years will be much lower. Under proper management, this plant community is productive and stable. The soil erosion is low to moderate. Infiltration and runoff are moderate.
Figure 17. Plant community growth curve (percent production by month). SD5801, Northern Rolling High Plains, cool-season dominant.. Cool-season dominant, uplands..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 4 | 12 | 25 | 36 | 10 | 5 | 4 | 4 | 0 | 0 |
Community 4.2
Shortgrass-Western Wheatgrass-Annual and Perennial Non-Native Cool-Season Grasses
This plant community develops from continuous seasonal or continuous season-long grazing and the invasion of non-native cool-season grasses. Species composition is made up of 85 percent warm-season shortgrasses and cool-season mid-grasses, 10 percent forbs, and approximately 5 percent shrubs. The dominant grasses and grass-like species include blue grama, buffalograss, threadleaf sedge, western wheatgrass, prairie Junegrass, Sandberg bluegrass, cheatgrass, and field brome. Under long-term non-use, Kentucky bluegrass and smooth brome may invade. Forbs commonly found on this plant community include cudweed sagewort, scarlet globemallow, common yarrow, and scurfpea. Under proper management, this plant community is stable. The soil erosion is low to moderate. Infiltration and runoff are moderate.
Figure 18. Plant community growth curve (percent production by month). SD5803, Northern Rolling High Plains, cool-season/warm-season co-dominant.. Cool-season, warm-season co-dominant, uplands..
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 3 | 10 | 20 | 28 | 21 | 10 | 5 | 3 | 0 | 0 |
Pathway 4.1A
Community 4.1 to 4.2
Continuous seasonal grazing during the active growing period of cool-season plants; or continuous season-long grazing; and drought will lead the Western Wheatgrass-Green Needlegrass-Annual and Perennial Non-Native Cool-Season Grasses Plant Community (4.1) to the Shortgrass-Western Wheatgrass- Annual and Perennial Non-Native Cool-Season Grasses Plant Community (4.2).
Pathway 4.2A
Community 4.2 to 4.1
Prescribed grazing, including proper stocking, change in season of use, and adequate plant recovery periods; and normal precipitation patterns following drought will move this plant community (4.2) toward the Western Wheatgrass-Green Needlegrass-Annual and Perennial Non-Native Cool-Season Grasses Plant Community (4.1). Prescribed burning may be a management option to help accelerate the change.
State 5
Disturbed State
Any plant community can transition to the Disturbed State (5.0). The three separate vegetative plant communities found in this State are highly variable in nature. They are derived through different management scenarios and are not related successionally. Infiltration, runoff, and soil erosion vary depending upon the vegetation present on the site.
Dominant plant species
-
broom snakeweed (Gutierrezia sarothrae), shrub
-
threeawn (Aristida), grass
-
dropseed (Sporobolus), grass
-
field brome (Bromus arvensis), grass
-
crested wheatgrass (Agropyron cristatum), grass
-
smooth brome (Bromus inermis), grass
-
western wheatgrass (Pascopyrum smithii), grass
-
squirreltail (Elymus elymoides), grass
-
foxtail barley (Hordeum jubatum), grass
-
sweetclover (Melilotus), other herbaceous
-
deathcamas (Zigadenus), other herbaceous
-
prickly lettuce (Lactuca serriola), other herbaceous
-
Canadian horseweed (Conyza canadensis), other herbaceous
-
forage kochia (Bassia prostrata), other herbaceous
-
common sunflower (Helianthus annuus), other herbaceous
Community 5.1
Go-back
The Go-back plant community can be reached whenever severe mechanical disturbance occurs (e.g., tilled and abandoned cropland). During the early successional stages, the species that mainly dominate are annual grasses and forbs, later replaced by both native and introduced perennials. The vegetation in this plant community can vary greatly, sometimes it is dominated by threeawn, dropseed, annual brome, crested wheatgrass, smooth brome, broom snakeweed, sweetclover, and non-native thistles. Other plants that commonly occur on the site can include western wheatgrass, deathcamas, prickly lettuce, mare’s tail, kochia, squirreltail, foxtail, and annual sunflower. Bare ground is prevalent due to the loss of organic matter and lower overall soil health.
Community 5.2
Mechanical Renovation
This plant community is an altered vegetation community achieved through mechanical renovation. Renovation creates microrelief that alters the water cycle by increasing infiltration and decreasing runoff. The renovation reduces the sod-bound conditions, increasing the vegetative production potential. These factors favor cool-season species such as western wheatgrass, green needlegrass, non-native cool-season grasses, and a variety of forbs. With proper management after renovation, this plant community will potentially have similar plant composition and growth curve characteristics as the Reference Plant Community (1.1). Proper grazing management must be implemented to maintain this plant community.
Community 5.3
Seeded
The Seeded Plant Community normally includes those areas seeded to pubescent or intermediate wheatgrass, crested wheatgrass, alfalfa, or other forage species. For adapted species, refer to the USDA-NRCS e-FOTG for the appropriate Forage Suitability Group description.
Transition T1B
State 1 to 2
Fire or brush management that removes the majority, or all the big sagebrush, continuous season-long grazing, or continuous seasonal grazing (early spring), will transition the Reference State (1.0) to the Shortgrass Sod State (2.0). This transition is most likely to occur from Plant Community 1.2.
Conservation practices
| Brush Management | |
|---|---|
| Prescribed Burning |
Transition T1A
State 1 to 3
The removal of the majority, or all big sagebrush, with fire or brush management, followed by heavy, continuous season-long grazing; frequent and severe defoliation; or heavy disturbance including livestock feeding areas will transition the Reference State (1.0) to the Early Successional State (3.0).
Transition T1C
State 1 to 4
Invasion of non-native cool-season annual grasses followed by fire can remove all, or the majority of, Wyoming big sagebrush from this site and transition the Reference State (1.0) to the Native/Invaded State (4.0). Wildfire or brush management targeting Wyoming big sagebrush and the invasion of non-native cool-season perennial grasses can cause this transition to the Native/Invaded State (4.0). If sagebrush does not occur on the site, long period of non-use will likely result in the transition of the Reference State (1.0) to the Native/Invaded State (4.0).
Conservation practices
| Brush Management | |
|---|---|
| Prescribed Burning |
Transition T6A
State 1 to 5
Heavy disturbance including, mechanical renovation, tillage, abandonment of cropland, seeding to improved pasture species, or long-term non-use and invasion of non- native cool-season grasses will result in a transition to the Disturbed State (5.0). This transition can occur from any plant community on this site.
Restoration pathway R2A
State 2 to 1
Removal of the grazing disturbance coupled with long-term prescribed grazing, and favorable climatic conditions, which allow for adequate plant recovery periods, and no fire, may cause a shift the Shortgrass Sod State (2.0) to the Reference State (1.0). This transition may not be rapid or in the end meet management goals.
Conservation practices
| Prescribed Grazing |
|---|
Transition T2A
State 2 to 3
Frequent and severe defoliation, or heavy disturbance, and extended periods of drought will move the Shortgrass Sod State (2.0) to the Early Successional State (3.0).
Transition T2B
State 2 to 4
Removal of the grazing disturbance along with long-term prescribed grazing, and favorable climatic conditions, which allow for adequate plant recovery periods, and fire, may cause a shift from the Shortgrass Sod State (2.0) to the Native/Invaded State (4.0). This transition my not be rapid or feasible.
Conservation practices
| Prescribed Grazing |
|---|
Transition T6A
State 2 to 5
Heavy disturbance including mechanical renovation, soil erosion, tillage, abandonment of cropland, or seeding to improved pasture species will result in a transition to the Disturbed State (5.0).
Restoration pathway R3A
State 3 to 1
Removal of grazing disturbance, and herbaceous weed control to address annual bromes and cactus followed with long-term prescribed grazing that incorporates proper stocking, change in season of use, and periodic deferment will potentially transition the Early Successional State (3.0) to the Reference State (1.0). A return to normal or above normal precipitation will help with this transition. This transition my not be rapid or in the end meet management goals.
Conservation practices
| Prescribed Grazing | |
|---|---|
| Herbaceous Weed Control |
Transition T3A
State 3 to 4
Removal of the grazing disturbance coupled with herbaceous weed control, and long-term prescribed grazing, along with favorable climatic conditions, which allow for adequate plant recovery periods, may shift the Early Successional State (3.0) to the Native/Invaded State (4.0). This transition may not be rapid or feasible.
Conservation practices
| Prescribed Grazing | |
|---|---|
| Herbaceous Weed Control |
Transition T6A
State 3 to 5
Transition T6A: Heavy disturbance including mechanical renovation, soil erosion, tillage, abandonment of cropland, or seeding to improved pasture species will result in a transition to the Disturbed State (5.0).
Transition T4A
State 4 to 2
Continuous season-long grazing or heavy grazing in combination with drought will transition the Native/Invaded State (4.0) to the Shortgrass Sod State (2.0).
Transition T4B
State 4 to 3
Heavy, continuous season-long grazing, or frequent and severe defoliation, or heavy disturbance including livestock feeding areas, will transition the Native/Invaded State (4.0) to the Early Successional State (3.0).
Transition T6A
State 4 to 5
Heavy disturbance including mechanical renovation, soil erosion, tillage, abandonment of cropland, or seeding to improved pasture species will result in a transition to the Disturbed State (5.0).
Additional community tables
Table 9. Community 1.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Rhizomatous Wheatgrass | 570–855 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 570–855 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–190 | – | ||
| Montana wheatgrass | ELAL7 | Elymus albicans | 0–190 | – | ||
| 2 | Cool-Season Bunchgrass | 285–570 | ||||
| green needlegrass | NAVI4 | Nassella viridula | 190–475 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–190 | – | ||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 0–57 | – | ||
| 3 | Other Cool-Season Grasses | 19–95 | ||||
| plains reedgrass | CAMO | Calamagrostis montanensis | 0–57 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 19–38 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–38 | – | ||
| 4 | Tall and Mid- Warm-Season Grasses | 95–190 | ||||
| big bluestem | ANGE | Andropogon gerardii | 0–190 | – | ||
| sideoats grama | BOCU | Bouteloua curtipendula | 19–190 | – | ||
| 5 | Short-Warm Season Grasses | 95–190 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 57–190 | – | ||
| buffalograss | BODA2 | Bouteloua dactyloides | 19–190 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–190 | – | ||
| 6 | Grass-Likes | 19–95 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 19–95 | – | ||
| needleleaf sedge | CADU6 | Carex duriuscula | 19–95 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 19–95 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–57 | – | ||
| 7 | Non-Native Cool-Season Grasses | 0 | ||||
|
Forb
|
||||||
| 8 | Forbs | 95–190 | ||||
| American vetch | VIAM | Vicia americana | 19–57 | – | ||
| false boneset | BREU | Brickellia eupatorioides | 0–57 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 19–57 | – | ||
| purple prairie clover | DAPU5 | Dalea purpurea | 19–57 | – | ||
| Forb, native | 2FN | Forb, native | 19–57 | – | ||
| leafy wildparsley | MUDI | Musineon divaricatum | 0–38 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 19–38 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 0–38 | – | ||
| scarlet globemallow | SPCO | Sphaeralcea coccinea | 19–38 | – | ||
| silverleaf Indian breadroot | PEAR6 | Pediomelum argophyllum | 0–38 | – | ||
| wavyleaf thistle | CIUN | Cirsium undulatum | 0–38 | – | ||
| western wallflower | ERAS2 | Erysimum asperum | 0–38 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 19–38 | – | ||
| milkvetch | ASTRA | Astragalus | 0–38 | – | ||
| Missouri goldenrod | SOMI2 | Solidago missouriensis | 19–38 | – | ||
| prairie thermopsis | THRH | Thermopsis rhombifolia | 19–38 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 0–19 | – | ||
| littlepod false flax | CAMI2 | Camelina microcarpa | 0–19 | – | ||
| beardtongue | PENST | Penstemon | 0–19 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 0–19 | – | ||
| pussytoes | ANTEN | Antennaria | 0–19 | – | ||
| rush skeletonplant | LYJU | Lygodesmia juncea | 0–19 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–19 | – | ||
| bighead pygmycudweed | EVPR | Evax prolifera | 0–19 | – | ||
| desertparsley | LOMAT | Lomatium | 0–19 | – | ||
| onion | ALLIU | Allium | 0–19 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 0–19 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–19 | – | ||
| woolly plantain | PLPA2 | Plantago patagonica | 0–19 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 95–190 | ||||
| silver sagebrush | ARCA13 | Artemisia cana | 0–95 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 0–95 | – | ||
| winterfat | KRLA2 | Krascheninnikovia lanata | 0–57 | – | ||
| Gardner's saltbush | ATGA | Atriplex gardneri | 0–57 | – | ||
| silver buffaloberry | SHAR | Shepherdia argentea | 0–57 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–57 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 19–38 | – | ||
| prairie rose | ROAR3 | Rosa arkansana | 0–38 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–38 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–19 | – | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–19 | – | ||
| pricklypear | OPUNT | Opuntia | 0–19 | – | ||
|
Moss
|
||||||
| 10 | Mat-Forming Forb | 0–19 | ||||
| lesser spikemoss | SEDE2 | Selaginella densa | 0–19 | – | ||
Table 10. Community 1.2 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Rhizomatous Wheatgrass | 60–240 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 60–240 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–60 | – | ||
| Montana wheatgrass | ELAL7 | Elymus albicans | 0–60 | – | ||
| 2 | Cool-Season Bunchgrass | 24–120 | ||||
| green needlegrass | NAVI4 | Nassella viridula | 24–120 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–60 | – | ||
| 3 | Other Cool-Season Grasses | 12–36 | ||||
| prairie Junegrass | KOMA | Koeleria macrantha | 12–24 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–24 | – | ||
| 4 | Tall and Mid- Warm-Season Grasses | 0–60 | ||||
| big bluestem | ANGE | Andropogon gerardii | 0–60 | – | ||
| sideoats grama | BOCU | Bouteloua curtipendula | 0–36 | – | ||
| 5 | Short-Warm Season Grasses | 180–420 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 120–300 | – | ||
| buffalograss | BODA2 | Bouteloua dactyloides | 60–240 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–36 | – | ||
| 6 | Grass-Likes | 60–180 | ||||
| needleleaf sedge | CADU6 | Carex duriuscula | 24–120 | – | ||
| threadleaf sedge | CAFI | Carex filifolia | 24–120 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 12–96 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–36 | – | ||
| 7 | Non-Native Cool-Season Grasses | 0 | ||||
|
Forb
|
||||||
| 8 | Forbs | 60–120 | ||||
| white sagebrush | ARLU | Artemisia ludoviciana | 12–48 | – | ||
| silverleaf Indian breadroot | PEAR6 | Pediomelum argophyllum | 12–36 | – | ||
| Forb, native | 2FN | Forb, native | 12–36 | – | ||
| Forb, introduced | 2FI | Forb, introduced | 12–24 | – | ||
| field cottonrose | LOAR5 | Logfia arvensis | 0–24 | – | ||
| wavyleaf thistle | CIUN | Cirsium undulatum | 0–24 | – | ||
| bighead pygmycudweed | EVPR | Evax prolifera | 12–24 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 12–24 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 12–24 | – | ||
| Missouri goldenrod | SOMI2 | Solidago missouriensis | 0–24 | – | ||
| purple prairie clover | DAPU5 | Dalea purpurea | 0–24 | – | ||
| woolly plantain | PLPA2 | Plantago patagonica | 12–24 | – | ||
| American vetch | VIAM | Vicia americana | 0–12 | – | ||
| pussytoes | ANTEN | Antennaria | 0–12 | – | ||
| rush skeletonplant | LYJU | Lygodesmia juncea | 0–12 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 0–12 | – | ||
| scarlet globemallow | SPCO | Sphaeralcea coccinea | 0–12 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–12 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 0–12 | – | ||
| prairie thermopsis | THRH | Thermopsis rhombifolia | 0–12 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 0–12 | – | ||
| littlepod false flax | CAMI2 | Camelina microcarpa | 0–12 | – | ||
| milkvetch | ASTRA | Astragalus | 0–12 | – | ||
| onion | ALLIU | Allium | 0–12 | – | ||
| leafy wildparsley | MUDI | Musineon divaricatum | 0–12 | – | ||
| desertparsley | LOMAT | Lomatium | 0–12 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–12 | – | ||
| western wallflower | ERAS2 | Erysimum asperum | 0–12 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 60–120 | ||||
| prairie sagewort | ARFR4 | Artemisia frigida | 12–60 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–60 | – | ||
| silver sagebrush | ARCA13 | Artemisia cana | 0–60 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 0–60 | – | ||
| silver buffaloberry | SHAR | Shepherdia argentea | 0–36 | – | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 12–36 | – | ||
| pricklypear | OPUNT | Opuntia | 12–36 | – | ||
| prairie rose | ROAR3 | Rosa arkansana | 0–24 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–24 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–12 | – | ||
|
Moss
|
||||||
| 10 | Mat-Forming Forb | 0–36 | ||||
| lesser spikemoss | SEDE2 | Selaginella densa | 0–36 | – | ||
Table 11. Community 1.3 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Rhizomatous Wheatgrass | 255–510 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 255–510 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–85 | – | ||
| Montana wheatgrass | ELAL7 | Elymus albicans | 0–85 | – | ||
| 2 | Cool-Season Bunchgrass | 85–225 | ||||
| green needlegrass | NAVI4 | Nassella viridula | 85–170 | – | ||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 0–85 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–85 | – | ||
| 3 | Other Cool-Season Grasses | 17–85 | ||||
| Sandberg bluegrass | POSE | Poa secunda | 17–85 | – | ||
| plains reedgrass | CAMO | Calamagrostis montanensis | 0–34 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 17–34 | – | ||
| 4 | Tall and Mid- Warm-Season Grasses | 0–85 | ||||
| sideoats grama | BOCU | Bouteloua curtipendula | 0–51 | – | ||
| big bluestem | ANGE | Andropogon gerardii | 0–34 | – | ||
| 5 | Short-Warm Season Grasses | 85–255 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 85–255 | – | ||
| buffalograss | BODA2 | Bouteloua dactyloides | 85–255 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–51 | – | ||
| 6 | Grass-Likes | 85–255 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 34–170 | – | ||
| needleleaf sedge | CADU6 | Carex duriuscula | 34–170 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 17–119 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–51 | – | ||
| 7 | Non-Native Cool-Season Grasses | 17–85 | ||||
| cheatgrass | BRTE | Bromus tectorum | 17–85 | – | ||
| crested wheatgrass | AGCR | Agropyron cristatum | 17–85 | – | ||
| smooth brome | BRIN2 | Bromus inermis | 0–34 | – | ||
| Kentucky bluegrass | POPR | Poa pratensis | 0–34 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 85–170 | ||||
| white sagebrush | ARLU | Artemisia ludoviciana | 17–68 | – | ||
| silverleaf Indian breadroot | PEAR6 | Pediomelum argophyllum | 17–51 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 17–51 | – | ||
| Forb, native | 2FN | Forb, native | 17–51 | – | ||
| Forb, introduced | 2FI | Forb, introduced | 17–51 | – | ||
| field cottonrose | LOAR5 | Logfia arvensis | 0–51 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 0–34 | – | ||
| leafy wildparsley | MUDI | Musineon divaricatum | 0–34 | – | ||
| woolly plantain | PLPA2 | Plantago patagonica | 17–34 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–34 | – | ||
| wavyleaf thistle | CIUN | Cirsium undulatum | 0–34 | – | ||
| western wallflower | ERAS2 | Erysimum asperum | 0–34 | – | ||
| bighead pygmycudweed | EVPR | Evax prolifera | 17–34 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 17–34 | – | ||
| false boneset | BREU | Brickellia eupatorioides | 0–34 | – | ||
| prairie thermopsis | THRH | Thermopsis rhombifolia | 0–34 | – | ||
| littlepod false flax | CAMI2 | Camelina microcarpa | 0–34 | – | ||
| purple prairie clover | DAPU5 | Dalea purpurea | 17–34 | – | ||
| pussytoes | ANTEN | Antennaria | 0–17 | – | ||
| rush skeletonplant | LYJU | Lygodesmia juncea | 0–17 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 0–17 | – | ||
| scarlet globemallow | SPCO | Sphaeralcea coccinea | 0–17 | – | ||
| milkvetch | ASTRA | Astragalus | 0–17 | – | ||
| Missouri goldenrod | SOMI2 | Solidago missouriensis | 0–17 | – | ||
| beardtongue | PENST | Penstemon | 0–17 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 0–17 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 0–17 | – | ||
| desertparsley | LOMAT | Lomatium | 0–17 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–17 | – | ||
| onion | ALLIU | Allium | 0–17 | – | ||
| American vetch | VIAM | Vicia americana | 0–17 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 170–425 | ||||
| silver sagebrush | ARCA13 | Artemisia cana | 17–255 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 34–255 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 0–85 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 17–85 | – | ||
| pricklypear | OPUNT | Opuntia | 17–68 | – | ||
| prairie rose | ROAR3 | Rosa arkansana | 17–51 | – | ||
| silver buffaloberry | SHAR | Shepherdia argentea | 0–51 | – | ||
| Gardner's saltbush | ATGA | Atriplex gardneri | 0–34 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–34 | – | ||
| winterfat | KRLA2 | Krascheninnikovia lanata | 0–17 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–17 | – | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–17 | – | ||
|
Moss
|
||||||
| 10 | Mat-Forming Forb | 17–51 | ||||
| lesser spikemoss | SEDE2 | Selaginella densa | 17–51 | – | ||
Table 12. Community 2.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Rhizomatous Wheatgrass | 7–70 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 7–70 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–21 | – | ||
| 2 | Cool-Season Bunchgrass | 0–21 | ||||
| green needlegrass | NAVI4 | Nassella viridula | 0–21 | – | ||
| 3 | Other Cool-Season Grasses | 7–21 | ||||
| prairie Junegrass | KOMA | Koeleria macrantha | 7–21 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–14 | – | ||
| 4 | Tall and Mid- Warm-Season Grasses | 0 | ||||
| 5 | Short Warm-Season Grasses | 175–350 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 105–245 | – | ||
| buffalograss | BODA2 | Bouteloua dactyloides | 70–175 | – | ||
| 6 | Grass-Likes | 70–140 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 35–105 | – | ||
| needleleaf sedge | CADU6 | Carex duriuscula | 35–105 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 14–70 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–21 | – | ||
| 7 | Non-Native Cool-Season Grasses | 7–35 | ||||
| Kentucky bluegrass | POPR | Poa pratensis | 7–35 | – | ||
| cheatgrass | BRTE | Bromus tectorum | 7–35 | – | ||
| smooth brome | BRIN2 | Bromus inermis | 0–35 | – | ||
| crested wheatgrass | AGCR | Agropyron cristatum | 7–35 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 35–70 | ||||
| white sagebrush | ARLU | Artemisia ludoviciana | 7–35 | – | ||
| silverleaf Indian breadroot | PEAR6 | Pediomelum argophyllum | 7–35 | – | ||
| Forb, introduced | 2FI | Forb, introduced | 7–35 | – | ||
| field cottonrose | LOAR5 | Logfia arvensis | 0–28 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 7–21 | – | ||
| woolly plantain | PLPA2 | Plantago patagonica | 7–21 | – | ||
| Forb, native | 2FN | Forb, native | 7–21 | – | ||
| bighead pygmycudweed | EVPR | Evax prolifera | 7–21 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 7–14 | – | ||
| leafy wildparsley | MUDI | Musineon divaricatum | 0–7 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–7 | – | ||
| wavyleaf thistle | CIUN | Cirsium undulatum | 0–7 | – | ||
| desertparsley | LOMAT | Lomatium | 0–7 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–7 | – | ||
| prairie thermopsis | THRH | Thermopsis rhombifolia | 0–7 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 0–7 | – | ||
| littlepod false flax | CAMI2 | Camelina microcarpa | 0–7 | – | ||
| milkvetch | ASTRA | Astragalus | 0–7 | – | ||
| Missouri goldenrod | SOMI2 | Solidago missouriensis | 0–7 | – | ||
| pussytoes | ANTEN | Antennaria | 0–7 | – | ||
| rush skeletonplant | LYJU | Lygodesmia juncea | 0–7 | – | ||
| scarlet globemallow | SPCO | Sphaeralcea coccinea | 0–7 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 35–70 | ||||
| pricklypear | OPUNT | Opuntia | 7–35 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 7–35 | – | ||
| silver sagebrush | ARCA13 | Artemisia cana | 0–35 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 0–35 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–28 | – | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 7–21 | – | ||
| prairie rose | ROAR3 | Rosa arkansana | 0–7 | – | ||
|
Moss
|
||||||
| 10 | Mat-Forming Forb | 7–49 | ||||
| lesser spikemoss | SEDE2 | Selaginella densa | 7–49 | – | ||
Interpretations
Animal community
Wildlife Interpretations
MLRA 58D lies within the drier portion of the northern mixed-grass prairie ecosystem where sagebrush steppes to the west yield to grassland steppes to the east. Prior to European settlement, this area consisted of diverse grass- and shrubland habitats interspersed with varying densities of depressional instream wetlands and woody riparian corridors. These habitats provided critical life cycle components for many users. Many species of grassland birds, small mammals, reptiles, amphibians, and herds of roaming bison, elk, and pronghorn were among the inhabitants adapted to this semi-arid region. Roaming herbivores, as well as several small mammal and insect species, were the primary consumers linking the grassland resources to predators such as the gray wolf, mountain lion, and grizzly bear, and smaller carnivores such as the coyote, bobcat, fox, and raptors. The prairie dog was once abundant; however, the species remains a keystone species within its range. The black-footed ferret, burrowing owl, ferruginous hawk, mountain plover, and swift fox were associated with prairie dog complexes.
Historically, the northern mixed-grass prairie was a disturbance-driven ecosystem with fire, herbivory, and climate functioning as the primary disturbance factors either singly or in combination. Following European settlement, livestock grazing, cropland conversion, elimination of fire, energy development, and other anthropogenic factors influenced species composition and abundance. Introduced and invasive species further impacted plant and animal communities. The bison was a historical keystone species but had been extirpated in this area as a free-ranging herbivore. The loss of the bison and reduction of prairie dog populations and fire as ecological drivers greatly influenced the character of the remaining native plant communities and altered wildlife habitats. Human development has reduced habitat quality for area-sensitive species.
Within MLRA 58D, the Clayey ecological site provides upland grassland cover with an associated forb component. It was typically part of an expansive grassland landscape that included combinations of Loamy, Shallow Loamy, Shallow Clayey, Thin Loamy, Claypan, Sands, Sandy, Sandy Claypan, and Thin Claypan ecological sites.
This site provided habitat for species requiring unfragmented grassland. Important habitat features, and components found commonly or exclusively on this site may include sharp-tailed grouse leks; upland nesting habitat for grassland birds, forbs and insects for brood habitat; and a forage source for small and large herbivores. Many grassland and shrub steppe nesting bird populations are declining. Extirpated species include free-ranging American bison, grizzly bear, gray wolf, black-footed ferret, mountain plover, Rocky Mountain locust, and swift fox.
The majority of the Clayey ecological site has remains intact and provides increasingly important habitat for grassland and shrub steppe nesting birds, small rodents, coyote, and a variety of reptiles, amphibians, and insects. Invasive species such as annual bromegrasses and crested wheat have impacted the biological integrity of the site for some grassland birds such as greater sage-grouse. Changes in historic fire regime and domestic grazing have impacted the forb/shrub/grass percentages. Greater sage-grouse and Brewer’s sparrow benefit when big sagebrush increases.
Western Wheatgrass-Green Needlegrass (1.1): The predominance of grasses plus high diversity of forbs and shrubs in this community favors grazers and mixed-feeders, such as deer and pronghorn. Insects, such as pollinators, play a large role in maintaining the forb community and provide a forage base for grassland birds and other species. The complex plant structural diversity provides habitat for a wide array of migratory and resident birds.
Brewer’s and grasshopper sparrow, lark bunting, western meadowlark, greater sage-grouse, and sharp-tailed grouse are common and benefit from the structure and composition this plant community provides. This site provides important breeding habitat for the loggerhead shrike. This site provides excellent nesting and brood rearing habitat for greater sage-grouse and sharp-tailed grouse. Diverse prey populations are available for grassland raptors such as ferruginous hawk, Swainson’s hawk, golden eagle, and prairie falcon.
The diversity of grasses, forbs, and shrubs provide high nutrition levels for small and large herbivores including voles, mice, least chipmunk, thirteen lined ground squirrel, white-tailed jackrabbit, and deer. This ecological site provides excellent wintering habitat for pronghorn. The moderate stature of this plant community provides suitable thermal, protective, and escape cover for small herbivores and grassland birds. Predators utilizing this plant community include coyote, American badger, red fox, and longtailed weasel. This plant community provides habitat for spade foot toad, Great Plains toad, bull snake, and western rattlesnake.
Buffalograss-Blue Grama-Western Wheatgrass (1.2): Resulting from continued heavy continuous season-long grazing without adequate recovery periods between grazing events or increased fire frequency, blue grama, and western wheatgrass will dominate. The forb diversity has decreased. A shift to shorter plant structure will favor prairie dog expansion and associate species such as ferruginous hawk, burrowing owl, tiger salamander, and swift fox. Species such as the horned lark, long-billed curlew, upland sandpiper, and white-tailed jackrabbit will increase due to the loss of big sagebrush. Density of species such as Brewer’s sparrow, greater sage-grouse, as well as, desert cottontail will greatly decline. However, this plant community may provide areas suitable for lek site development.
The short stature of this plant community limits thermal, protective, and escape cover. Predators utilizing this plant community include the coyote, American badger, red fox, and long-tailed weasel.
Big Sagebrush > 5% Cover/Western Wheatgrass-Green Needlegrass (1.3): This plant community develops after an extended fire free period favoring species such as big sage brush. This increases habitat diversity and quality for species such as greater sage-grouse, Brewer’s sparrow, and desert cottontail. This site provides excellent habitat for wintering pronghorn and greater sage-grouse. Chestnut-collared longspur may decrease with the increase of big sagebrush while vesper sparrow, and western meadowlark, are still common. Prey populations are available for grassland raptors such as golden eagle, ferruginous hawk, Swainson’s hawk, and northern harrier. Predators utilizing this plant community include coyote, American badger, red fox, and long-tailed weasel.
Buffalograss/Blue Grama/Clubmoss (2.1): This plant community develops under continuous seasonal grazing or from over utilization during extended drought periods. The forb diversity has decreased. A shift to short plant structure will favor prairie dog expansion with prairie dog town sites and associate species such as ferruginous hawk and burrowing owl. Species such as the horned lark, long-billed curlew, upland sandpiper, and white-tailed jackrabbit will increase due to the loss of big sagebrush. Species such as Brewer’s sparrow, greater sage-grouse, as well as, desert cottontail will rarely use this site.
The short stature of this plant community limits thermal, protective, and escape cover. Prey populations are reduced but are more vulnerable to predation by raptors and mammalian predators. Predators utilizing this plant community include the coyote, American badger, red fox, and long-tailed weasel. Extreme impairment of the ecological processes impacts offsite aquatic habitats through excessive runoff, nutrient, and sediment loads. Elevated surface temperatures resulting from reduced cover and litter will greatly reduce habitat for most amphibian species, grassland birds, and mammals.
Threeawn-Annual Grasses/Prickly Pear Cactus (3.1): This plant community develops under severe disturbance or excessive defoliation. The dominant vegetation includes pioneer annual grasses, forbs, invaders, and early successional biennial and perennial species. Plant species from adjacent ecological sites may become minor components of this plant community. The community is susceptible to invasion of annual bromegrasses, crested wheatgrass, and other nonnative species due to severe soil disturbances and relatively high percent of bare ground.
Soil erosion is potentially high, impacting offsite aquatic habitats through increased runoff, nutrient, and sediment loads. Reduced surface cover, low plant density, low plant vigor, loss of root biomass, and soil compaction, all contribute to decreased wildlife abundance and diversity.
Since secondary succession is highly variable plant and wildlife species will vary. This plant community provides habitat for generalist or early successional species.
Grazing Interpretations
The following list suggests annual, initial stocking rates for average growing conditions. These estimates are conservative and should be used only as guidelines in the initial stages of conservation planning. Commonly, the current plant composition does not entirely match any particular plant community (as described in this ecological site description). Therefore, a resource inventory is necessary to document plant composition and production. More accurate estimates of carrying capacity should eventually be calculated using the following stocking rate information along with animal preference data and actual stocking records, particularly when grazers other than cattle are involved. In consultation with the land manager, a more intensive grazing management program that results in improved harvest efficiencies and increased carrying capacity may be developed.
The following suggested initial stocking rates are based on 912 lb/acre (air-dry weight) per animal-unit-month (AUM) with a 25 percent harvest efficiency of preferred and desirable forage species (refer to USDA-NRCS, National Range and Pasture Handbook). An AUM is defined as the equivalent amount of forage required by a 1,000-pound cow, with or without calf, for one month.
Plant Community: Western Wheatgrass-Green Needlegrass (1.1)
Average Production (lb/acre, air-dry): 1,900
Stocking Rate (AUM/acre): 0.52
Plant Community: Buffalograss-Blue Grama-Western Wheatgrass (1.2)
Average Production (lb/acre, air-dry): 1,200
Stocking Rate (AUM/acre): 0.33
Plant Community: Big Sagebrush > 5% Cover/Western Wheatgrass-Green Needlegrass (1.3)
Average Production (lb/acre, air-dry): 1,700
Stocking Rate (AUM/acre): 0.47
Plant Community: Buffalograss-Blue Grama/Clubmoss (2.1)
Average Production (lb/acre, air-dry): 700*
Stocking Rate (AUM/acre): 0.19*
Plant Community: All other plant communities identified in this document have variable annual production values and require onsite sampling to determine initial stocking rates.
* Total annual production and stocking rates are highly variable and require onsite sampling.
Total onsite annual production may contain vegetation deemed undesirable or untargeted by the grazing animal. Therefore, AUM values may need to be reduced to reflect only preferred or desirable forage species.
Grazing by domestic livestock is one of the major income-producing industries in the area. Rangeland in this area may provide yearlong forage for livestock. During the dormant period, the forage for livestock likely has insufficient protein to meet livestock requirements. Added protein allows ruminants to better utilize the energy stored in grazed plant materials. A forage quality test (either directly or through fecal sampling) should be used to determine the level of supplementation needed.
Hydrological functions
Water is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic group D. Infiltration and runoff potential for this site varies from moderate to high depending on soil hydrologic group, slope, and ground cover. In many cases, areas with greater than 75 percent ground cover have the greatest potential for high infiltration and lower runoff. An example of an exception would be where shortgrasses form a strong sod and dominate the site. Normally areas where ground cover is less than 50 percent have the greatest potential to have reduced infiltration and higher runoff. Refer to the USDA-NRCS National Engineering Handbook, Part 630, for hydrologic soil groups, runoff quantities, and hydrologic curves.
Recreational uses
This site provides opportunities for hunting upland game species. The wide variety of plants that bloom from spring until fall have aesthetic value that appeals to visitors.
Wood products
No appreciable wood products are typically present on this site.
Other products
Harvesting the seeds of native plants can provide additional income on this site.
Other information
Revision Notes: “Previously Approved” Provisional
This provisional ecological site description (ESD) has passed quality control (QC) and quality assurance (QA) to ensure it meets the 2014 NESH standards for a “Provisional” ecological site description.
This ecological site description (ESD) is an updated “Previously Approved” ESD that represented a first-generation tier of documentation that met all requirements as an “Approved” ESD as laid out in the 1997 National Range and Pasture Handbook (NRPH). The requirements for approved status changed with the release of the 2014 National Ecological Site Handbook (NESH). The previously approved document fully described the reference state and community phases in the state-and-transition model. All other alternative states were at least described in narrative form. The “Previously Approved” ESD has been field-tested for a minimum of five years and is a proven functional document for conservation planning. The “Previously Approved” ESD may not contain all tabular and narrative entries as required in the current “Approved” level of documentation, but it is expected this ESD will continue refinement toward the current “Approved” status.
Site Development and Testing Plan
Future work, as described in an official project plan, is necessary to validate the information in this provisional ecological site description. The plan will include field activities for low-, medium-, and high-intensity sampling, soil correlations, and analysis of the data. Annual field reviews should be done by soil scientists and vegetation specialists. Final field review, peer review, quality control, and quality assurance reviews are required to produce the final
Supporting information
Inventory data references
Information presented here has been derived from NRCS clipping data and other inventory data. Field observations from range-trained personnel were also used. Those involved in developing this site description include: Ryan Beer, Range Management Specialist (RMS), NRCS; Chuck Berdan, Biologist, Bureau of Land Management (BLM); Stan Boltz, RMS, NRCS; Dave Dewald, Wildlife BIO, NRCS; Cheryl Nielsen, RMS, NRCS; Jeff Printz, RMS, NRCS; Mike Stirling, RMS, NRCS; Dan Svingen, BIO, USFS; Darrell Vanderbusch, Soil Scientist, NRCS; Cindy Zachmeier, BIO, NRCS; and Tim Zachmeier, BIO, BLM.
Other references
Cleland, D.T., J.A. Freeouf, J.E. Keys, G.J. Nowacki, C.A. Carpenter, and W.H McNab. 2007. Ecological subregions: Sections and subsections of the conterminous United States. USDA Forest Service, General Technical Report WO-76D. https://www.fs.fed.us/research/publications/misc/73326-wo-gtr-76d-cleland2007.pdf (accessed 31 January 2019).
High Plains Regional Climate Center, University of Nebraska. 2018. http://www.hprcc.unl.edu/ (accessed 6 April 2018).
Innes, Robin J. 2019. Artemisia tridentata subsp. wyomingensis, Wyoming big sagebrush. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Missoula Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/shrub/arttriw/all.html (accessed 9 December 2019).
Larson, G.E. and J.R. Johnson. 1999. Plants of the Black Hills and Bear Lodge Mountains. South Dakota State University, College of Agriculture and Biological Sciences and Agriculture Experiment Station, Bulletin 732, Brookings, SD.
Toledo, D., M. Sanderson, K. Spaeth, J. Hendrickson, and J. Printz. 2014. Extent of Kentucky bluegrass and its effect on native plant species diversity and ecosystem services in the Northern Great Plains of the United States. Invasive Plant Science and Management. 7(4):543–522. Weed Science Society of America.
Soil Survey Staff. 2018. Official soil series descriptions. USDA Natural Resources Conservation Service. https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/home/?cid=nrcs142p2_053587 (accessed 5 December 2019).
Soil Survey Staff. 2018. Web Soil Survey. USDA Natural Resources Conservation Service. https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx (accessed 5 December 2019).
U.S. Department of Agriculture, Natural Resources Conservation Service. 1997. National range and pasture handbook, rev. 1, 2003. https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb1043055.pdf (accessed 7 January 2018).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. Agriculture Handbook 296. https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_050898.pdf (accessed 17 January 2018).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2012. National engineering handbook, part 630. Hydrology chapters from e-Directives. https://directives.sc.egov.usda.gov/viewerFS.aspx?hid=21422 (accessed 17 January 2018).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2014. National ecological site handbook, 1st ed. https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcseprd1291232 (accessed 27 January 2018).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2018. Climate data. National Water and Climate Center. http://www.wcc.nrcs.usda.gov/ (accessed 2 December 2018).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2018. Electronic field office technical guide. https://efotg.sc.egov.usda.gov (accessed 22 November 2019).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2018. National Soil Information System, Information Technology Center. http://nasis.nrcs.usda.gov (accessed 25 May 2018.
U.S. Department of Agriculture, Natural Resources Conservation Service. 2018. PLANTS database. National Plant Data Team, Greensboro, NC. http://plants.usda.gov (accessed 5 December 2019).
U.S. Environmental Protection Agency. 2018. EPA level III and level IV ecoregions of the conterminous United States. https://www.epa.gov/eco-research/level-iii-and-iv-ecoregions- conterminous-united-states (accessed 26 April 2018).
Contributors
Rick L. Peterson
Stan C. Boltz
Travis Patient
Approval
Suzanne Mayne-Kinney, 7/18/2024
Acknowledgments
This ecological site description was updated by Rick L. Peterson on December 11, 2019.
The ESDs were available for QC review by Mark Hayek, Emily Helms, Ryan Beer, and Mitch Faulkner.
All ecological sites were then reviewed and approved at the Provisional Level by David Kraft, Regional ESS, Salina, KS in September 2020.
Non-Discrimination Statement
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To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, available online at https://www.ascr.usda.gov/filing-program-discrimination-complaint-usda-customer and at any USDA office, or write a letter addressed to USDA and provide in the letter all of the information requested in the form. To request a copy of the complaint form, call (866) 632-9992. Submit your completed form or letter to USDA by:
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Rangeland health reference sheet
Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.
| Author(s)/participant(s) | Stan Boltz, Ryan Beer, Mitch Iverson, Thad Berrett, Cheryl Nielsen |
|---|---|
| Contact for lead author | stanley.boltz@sd.usda.gov, 605-352-1236 |
| Date | 07/23/2009 |
| Approved by | Suzanne Mayne-Kinney |
| Approval date | |
| Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
None. -
Presence of water flow patterns:
None, or barely visible and discontinuous. -
Number and height of erosional pedestals or terracettes:
None. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
0 to 10 percent is typical. -
Number of gullies and erosion associated with gullies:
None should be present. -
Extent of wind scoured, blowouts and/or depositional areas:
None. -
Amount of litter movement (describe size and distance expected to travel):
Litter should fall in place. Slight amount of movement of smallest size class litter is possible, but not normal. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil aggregate stability ratings should typically be 5 to 6, normally 6. Surface organic matter adheres to the soil surface. Soil surface fragments will typically retain structure indefinitely when dipped in distilled water. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
A-horizon should be 3 to 6 inches thick with mollic (dark) colors when moist. Structure typically is medium to fine granular at least in the upper A-horizon. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Combination of shallow and deep rooted species (mid & tall rhizomatous and tufted perennial cool-season grasses) with fine and coarse roots positively influences infiltration. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None – when dry, B horizons can be hard and appear to be compacted, but no platy structure will be present. -
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):
Dominant:
Rhizomatous wheatgrasses > mid cool-season bunchgrasses >>Sub-dominant:
Mid warm-season grasses = short warm-season grass >Other:
Forbs = shrubs > short cool-season bunchgrassesAdditional:
-
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Very little evidence of decadence or mortality. Bunch grasses have strong, healthy centers and shrubs are vigorous. -
Average percent litter cover (%) and depth ( in):
-
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Production ranges from 1,300-2,600 lbs./acre (air-dry weight). Reference value production is 1,900 lbs./acre (air-dry weight). -
Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
State and local noxious weeds, Kentucky bluegrass -
Perennial plant reproductive capability:
All species exhibit high vigor relative to climatic conditions. Do not rate based solely on seed production. Perennial grasses should have vigorous rhizomes or tillers.
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The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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