Natural Resources
Conservation Service
Ecological site R061XN010SD
Loamy-North (18-22" PZ)
Last updated: 7/17/2024
Accessed: 12/22/2024
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): 061X–Black Hills Foot Slopes
The Black Hills Foot Slopes (MLRA 61) is shared between Wyoming (WY) (58 percent) and South Dakota (SD) (42 percent). The MLRA is approximately 1,865 square miles in size. The towns of Spearfish, Sturgis, and Hot Springs, South Dakota and Newcastle and Sundance, Wyoming are all within the boundary of this MLRA. Rapid City, South Dakota is on the eastern edge of the MLRA. Wind Cave National Park, Devils Tower National Monument, and parts of Thunder Basin National Grassland and the Black Hills National Forest are located in MLRA 61. Devils Tower was our nation’s first National Monument, designated by President Theodore Roosevelt in 1906.
The Black Hills Foot Slopes consists of steeply dipping rocks circling the domed mountains of the Black Hills. As the mountains were uplifted, older sediments were tipped up, so they dip away from the core of the mountains. The Lower Cretaceous Fall River and Lakota (Inyan Kara Group) sandstones that occur on the outside boundary of the area are referred to as the Dakota Hogback. The next geologic formation is the Triassic-aged red beds of the Spearfish shale which form a low valley. The “red valley” surrounds the Black Hills between the two ridges formed by the Inyan Kara (hogback) and Minnekahta Formations associated with the Black Hills (MLRA 62). The Lakota referred to the red valley as the “Big Racecourse or the Red Racetrack.” The red beds have gypsum and anhydrous layers. Ground water seepage can dissolve these layers, creating sinkholes on the surface.
The average elevation of MLRA 61 ranges from 2,950 to 3,940 feet with extremes to 5,580 feet. Slopes are generally hilly; however, the interior red beds are nearly level to moderately sloping. The exterior hogback is steep, erosion-resistant rock. The Belle Fourche River is the only river to flow through MLRA 61, near Hulett, Wyoming.
The dominant soil orders in this MLRA are Alfisols, Entisols, and Mollisols. The soils in the area have predominantly frigid or mesic soil temperature regimes, and aridic or ustic soil moisture regimes. Soils are shallow to very deep, generally well drained, and loamy.
Annual precipitation is 16 to 22 inches. The majority of rainfall occurs early in the growing season with some high-intensity thunderstorms occurring mid-late summer. This MLRA supports open grassland, open ponderosa forest, and savanna-like vegetation. The grassland is characterized by native grasses, such as big and little bluestem, western wheatgrass, needle and thread, prairie dropseed, and green needlegrass. Bur oak grows throughout the northern area and can develop into nearly pure stands.
The major resource concerns are urban expansion, water quality, wind erosion, and water erosion.
Of the total acreage making up MLRA 61, 54 percent is privately owned rangeland and 19 percent forest land. Federal lands make up 7 percent of the rangeland and 5 percent of the forest land. The remaining 15 percent is privately owned cropland and urban development (USDA, NRCS. 2006. Ag Handbook 296).
LRU notes
For development of ecological sites, MLRA 61 is divided into three precipitation zones (PZ).
The northern area (18–22” PZ) extends from just south of Rapid City, South Dakota, north to the Wyoming border.
The southern area (16–18” PZ) extends from Newcastle, Wyoming, south to Hot Springs, South Dakota, then north to just south of Rapid City.
The western area (16–20” PZ) is primarily located in Wyoming, extending from Newcastle in the south, to north of the Bear Lodge Mountains, then south through the gap between the Bear Lodge Mountains and the Black Hills.
One additional grouping of ecological sites represents sites that are common for the entire MLRA and do not have a precipitation zone designation.
The forest lands in MLRA 61 are represented by three forest ecological sites, which are currently correlated to MLRA 62 Black Hills.
Classification relationships
USDA - Land Resource Region G – Western Great Plains Range and Irrigated Region, Major Land Resource Area (MLRA) 61 - Black Hills Foot Slopes
US Environmental Protection Agency (EPA) Level IV Ecoregions of the Conterminous United States:
Black Hills Foothills - 17a
USDA Forest Service, Ecological Subregions: Sections and Subsections of Conterminous United States:
Black Hills Coniferous Forest Province - M334, Black Hills Foothills Subsection - M334Aa
Ecological site concept
The Loamy 18-22" PZ ecological site occurs throughout the northern portion of MLRA 61. It is located on upland landscapes and does not receive additional moisture from runoff or overflow. The typical slope range is from 2 to 15 percent. Soils are deep (greater than 20 inches). The surface layer is 4 to 9 inches thick with loam to silt loam textures. Subsurface textures range from loam to clay loam.
The vegetation in the Reference State (1.0) consists of a co-dominant mix of cool- and warm-season grasses. Big bluestem, western wheatgrass, needle and thread, green needlegrass, and sideoats grama are the dominant grasses. Forbs are common and diverse. Shrubs, such as western snowberry, rose, and leadplant are almost always present in minor amounts. The Loamy 18-22” PZ site is susceptible to invasion of non-native cool-season grasses.
Associated sites
| R061XY020SD |
Overflow The Overflow ecological site is found on lower landscapes below the Loamy 18-22” PZ ecological site in flood plains and creek channels. |
|---|---|
| R061XN012SD |
Thin Upland-North (18-22" PZ) The Thin Upland 18-22” PZ ecological site is found on steeper slopes adjacent to the Loamy 18-22” PZ ecological site. |
| R061XN011SD |
Clayey-North (18-22" PZ) The Clayey 18-22” PZ ecological site is found on the same landscape position adjacent to the Loamy 18-22” PZ ecological site. |
| R061XN024SD |
Shallow Loamy-North (18-22" PZ) The Shallow Loamy ecological site is found on ridge tops and steep slopes adjacent to the Loamy 18-22” PZ ecological site. |
Similar sites
| R061XY020SD |
Overflow The Overflow ecological site will have more big bluestem, and greater vegetative production than the Loamy 18-22” PZ ecological site. |
|---|---|
| R061XN011SD |
Clayey-North (18-22" PZ) The Clayey 18-22” PZ ecological site will have more green needlegrass, and less needle and thread, and big bluestem than the Loamy 18-22” PZ ecological site. |
Table 1. Dominant plant species
| Tree |
Not specified |
|---|---|
| Shrub |
Not specified |
| Herbaceous |
(1) Andropogon gerardii |
Physiographic features
The Loamy 18-22” PZ ecological site occurs on level to moderately sloping uplands.
Table 2. Representative physiographic features
| Landforms |
(1)
Upland
> Hill
(2) Plain (3) Fan |
|---|---|
| Runoff class | Medium to high |
| Flooding frequency | None |
| Ponding frequency | None |
| Elevation | 2,900 – 4,000 ft |
| Slope | 2 – 15% |
| Water table depth |
Not specified |
| Aspect | Aspect is not a significant factor |
Climatic features
The climate in the Northern Land Resource Unit (LRU) of MLRA 61 is typical of the drier portions of the Northern Great Plains where sagebrush steppes to the west yield to grassland steppes to the east. Annual precipitation ranges from 18 to 22 inches per year, with most falling during the growing season. Temperatures show a wide range between the summer and winter months and between daily maximums and minimums, due to the high elevation and dry air, which permits rapid incoming and outgoing radiation. Cold air outbreaks from Canada in winter move rapidly from northwest to southeast and account for extreme minimum temperatures. Chinook winds may occur in the winter and bring rapid rises in temperature. Extreme storms may occur during the winter months, but most severely affect ranch operations during late winter and spring.
The average annual temperature is about 46°F. January is the coldest month with average temperatures ranging from about 26°F (Fort Meade, SD) to about 30°F (Spearfish, SD). July is the warmest month with temperatures averaging from about 75°F (Spearfish, SD) to about 69°F (Fort Meade, SD). The range of average monthly temperatures between the coldest and warmest months is about 45°F. Hourly winds are estimated to average about 11 miles per hour annually, ranging from about 13 miles per hour during the spring months to about 10 miles per hour during the summertime. Daytime winds are generally stronger than nighttime and occasional storms may bring brief periods of high winds with gusts to more than 50 miles per hour.
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. Green-up of cool-season plants may occur in September and October when adequate soil moisture is present.
Table 3. Representative climatic features
| Frost-free period (characteristic range) | 113-118 days |
|---|---|
| Freeze-free period (characteristic range) | 136-148 days |
| Precipitation total (characteristic range) | 20-22 in |
| Frost-free period (actual range) | 112-119 days |
| Freeze-free period (actual range) | 134-153 days |
| Precipitation total (actual range) | 19-22 in |
| Frost-free period (average) | 116 days |
| Freeze-free period (average) | 143 days |
| Precipitation total (average) | 21 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) BEAR RIDGE [USC00390554], Spearfish, SD
-
(2) SPEARFISH [USC00397882], Spearfish, SD
-
(3) FT MEADE [USC00393069], Fort Meade, SD
-
(4) RAPID CITY 4NW [USC00396947], Rapid City, SD
Influencing water features
No riparian areas or wetland features are directly associated with the Loamy 18-22” PZ ecological site.
Wetland description
Not Applicable.
Soil features
Soils common to the Loamy 18-22” PZ ecological site have a surface layer that is 4 to 9 inches thick, with textures ranging from loam to silty clay, and weak fine to medium granular structure. The subsurface textures are loam to clay loam. Slopes range from about 2 to 15 percent. The soils in this site are well drained and formed in residuum and alluvium. The soils have a moderate to moderately-slow infiltration rate. This site typically should show slight to no evidence of rills, wind-scoured areas, or pedestalled plants. If present, water flow paths are broken, irregular in appearance, or discontinuous. The soil surface is stable and intact. Subsurface soil layers are nonrestrictive to water movement and root penetration.
Major soils correlated to the Loamy 18-22” PZ ecological site include, Altvan, Blackpipe, Boneek, Gurney, Recluse, Thirtynine, Tilford, Vale, and Weber.
These soils are mainly susceptible to water erosion. The hazard of water erosion increases on slopes greater than about 10 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 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 details 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
(2) Residuum |
|---|---|
| Surface texture |
(1) Loam (2) Silt loam |
| Family particle size |
(1) Loamy |
| Drainage class | Well drained |
| Permeability class | Moderately slow to moderate |
| Soil depth | 40 – 80 in |
| Surface fragment cover <=3" | 4% |
| Surface fragment cover >3" | Not specified |
| Available water capacity (0-40in) |
6 – 8 in |
| Calcium carbonate equivalent (0-40in) |
20% |
| Electrical conductivity (0-40in) |
4 mmhos/cm |
| Sodium adsorption ratio (0-40in) |
2 |
| Soil reaction (1:1 water) (0-40in) |
6.1 – 9.1 |
| Subsurface fragment volume <=3" (Depth not specified) |
4% |
| Subsurface fragment volume >3" (Depth not specified) |
Not specified |
Ecological dynamics
The Loamy 18-22” PZ 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 will occur in the plant communities due to short-term weather variations, impacts of native and exotic plant and animal species, and management actions. While the following plant community descriptions specify more typical transitions between communities that will occur, 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.
Continuous season-long grazing (during the typical growing season of May through October) or heavy continuous grazing (e.g., every spring or every summer at moderate to heavy stocking levels) without adequate recovery periods following grazing events causes departure from the Bluestem-Wheatgrass-Needlegrass Plant Community (1.1). Because of the predominance of non-native cool-season grasses, bluegrass and potentially smooth brome will invade and eventually develop into a sod. Western wheatgrass will increase initially and then begin to decrease. Green needlegrass, big bluestem, sideoats grama, switchgrass, and Indiangrass will decrease in frequency and production. Excessive defoliation can cause threeawn and annuals to increase and dominate the site. Extended periods of non-use or lack of fire will result in excessive litter and a plant community dominated by cool-season grasses such as green needlegrass, western wheatgrass, bluegrass, smooth brome, and cheatgrass.
Interpretations are primarily based on the Bluestem-Wheatgrass-Needlegrass Plant Community (1.1). This plant community can still be found in MLRA 61, but because of the prevalence of non-native cool-season grasses it is uncommon to find a site that is not invaded. The Reference Plant Community (1.1) has been determined by study of 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 community phases, states, transitional pathways, and thresholds have been determined through similar studies and experience.
The following is a State-and-Transition diagram that illustrates the common plant communities that can occur on the site and the transition pathways between communities. The ecological processes will be 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 1 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
State 5 submodel, plant communities
State 1
Reference State
The Reference State 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 co-dominated by cool- and warm-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- and warm-season grasses 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 prescribed burning and sometimes on areas receiving occasional short periods of rest. The Reference State is very susceptible to invasion of non-native cool-season grasses.
Community 1.1
Bluestem-Wheatgrass-Needlegrass
Interpretations are based primarily on the Bluestem-Wheatgrass-Needlegrass Plant Community, which is also considered to be the Reference Plant Community (1.1). The potential vegetation is about 75 percent grasses or grass-like plants, 15 percent forbs, and 10 percent shrubs. The community is co-dominated by cool- and warm-season grasses. The major grasses included big bluestem, western wheatgrass, needle and thread, green needlegrass, and sideoats grama. Other grass or grass-like species include little bluestem, slender wheatgrass, Indiangrass, switchgrass, plains muhly, prairie dropseed, and threadleaf sedge. This plant community is resilient and well adapted to the Northern Great Plains climatic conditions. The diversity in plant species allows for high drought tolerance. This is a sustainable plant community in regard to soil and site stability, watershed function, and biologic integrity.
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 | 1910 | 2460 | 2940 |
| Forb | 145 | 300 | 500 |
| Shrub/Vine | 145 | 225 | 325 |
| Tree | 0 | 15 | 35 |
| Total | 2200 | 3000 | 3800 |
Figure 9. Plant community growth curve (percent production by month). SD6103, Black Hills Foot Slopes, cool-season/warm-season co-dominant. Cool-season, warm-season co-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 10 | 20 | 28 | 21 | 10 | 5 | 3 |
State 2
Native/Invaded State
The Native/Invaded State represents the more common range of variability that exists with higher levels of grazing management, but in the absence of periodic fire due to fire suppression. This state is dominated by native cool- and warm-season grasses, and subdominant non-native cool-season grasses. It can be found on areas that would appear to be properly managed with grazing and possibly prescribed burning. Extended periods of non-use and no fire or long-term light grazing can result in the invasion and establishment of non-native cool-season grasses onto this site. If the native cool-season grasses decline, a corresponding increase of non-native cool-season grasses can occur. The non-native cool-season grasses will include smooth brome, Kentucky bluegrass, cheatgrass, and field brome.
Community 2.1
Wheatgrass-Bluestem-Non-Native Cool-Season Grasses (<15%)
Figure 10. Loamy 18-22" PZ, PCP 2.1
This plant community phase is similar to the Bluestem-Wheatgrass-Needlegrass Plant Community (1.1), but it also contains minor amounts of non-native invasive grass species such as Kentucky bluegrass and smooth brome (up to about 15 percent by air-dry weight). The potential vegetation is about 80 percent grasses or grass-like plants, 10 percent forbs, and 10 percent shrubs. The community is co-dominated by cool- and warm-season grasses. The major grasses include western wheatgrass, needle and thread, big bluestem, green needlegrass, sideoats grama, and little bluestem. Other grass or grass-like species include slender wheatgrass, plains muhly, prairie dropseed, threadleaf sedge, blue grama, Kentucky bluegrass, and smooth brome. This plant community is resilient and well adapted to the Northern Great Plains climatic conditions. The diversity in plant species allows for high drought tolerance. This is a sustainable plant community in regard to soil and site stability, watershed function, and biologic integrity. However, the presence of smooth brome, Kentucky bluegrass, and other invasive species will begin to alter the soil biotic community and potentially lead to further invasion of non-native species.
Figure 11. 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 | 1560 | 2112 | 2620 |
| Forb | 120 | 188 | 275 |
| Shrub/Vine | 120 | 188 | 275 |
| Tree | 0 | 12 | 30 |
| Total | 1800 | 2500 | 3200 |
Figure 12. Plant community growth curve (percent production by month). SD6102, Black Hills Foot Slopes, cool-season dominant, warm-season sub-dominant. Cool-season dominant, warm-season sub-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 10 | 23 | 34 | 15 | 6 | 5 | 4 |
Community 2.2
Western Wheatgrass-Bluegrass-Annual Brome
This plant community is a result of continuous seasonal grazing, continuous season-long grazing at moderate to heavy levels, excessive haying, or from long-term light grazing. The potential plant community is made up of approximately 80 percent grass and grass-like species, 10 percent forbs, and 10 percent shrubs. Dominant grass and grass-like species include western wheatgrass, Kentucky and Canada bluegrass, needle and thread, blue grama, threadleaf sedge, and annual bromes (cheatgrass and field brome). Grasses of secondary importance include green needlegrass, sideoats grama, big bluestem, little bluestem, prairie Junegrass, and smooth brome. Forbs commonly found in this plant community include white sagebrush (cudweed sagewort), Cuman ragweed, goldenrod, scurfpea, western yarrow, and white prairie aster. When compared to the Bluestem-Wheatgrass-Needlegrass Plant Community (1.1), blue grama and threadleaf sedge have increased, and bluegrass has invaded and increased. Needle and thread and green needlegrass have decreased, and production of mid- and tall warm-season grasses has also been reduced. This plant community is moderately resistant to change. The herbaceous species present are well adapted to grazing; however, species composition can be further altered through long-term overgrazing. If the herbaceous component is intact, it tends to be resilient if the disturbance is not long-term.
Figure 13. 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 | 1220 | 1606 | 2090 |
| Forb | 90 | 143 | 195 |
| Shrub/Vine | 90 | 142 | 195 |
| Tree | 0 | 9 | 20 |
| Total | 1400 | 1900 | 2500 |
Figure 14. Plant community growth curve (percent production by month). SD6102, Black Hills Foot Slopes, cool-season dominant, warm-season sub-dominant. Cool-season dominant, warm-season sub-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 10 | 23 | 34 | 15 | 6 | 5 | 4 |
Community 2.3
Western Wheatgrass-Smooth Brome-Bluegrass
Figure 15. Loamy 18-22" PZ, PCP 2.3
This plant community is a result of excessive haying, or a lack of disturbance over prolonged periods of time, from continuous season-long grazing, or long-term light grazing. In the latter case, this plant community may be intermingled with heavily grazed patches. The potential plant community is made up of approximately 70 percent grass and grass-like species, 15 percent forbs, and 15 percent shrubs. Dominant grasses include western wheatgrass, green needlegrass, smooth brome, and Kentucky and Canada bluegrass. Grasses and grass-like species of secondary importance include slender wheatgrass, sideoats grama, needle and thread, little bluestem, threadleaf sedge, and blue grama. Forbs commonly found in this plant community include white sagebrush (cudweed sagewort), goldenrod, white prairie aster, and western yarrow. When compared to the Bluestem-Wheatgrass-Needlegrass Plant Community (1.1), smooth brome, and bluegrass have invaded and increased to sub-dominance. Green needlegrass and sideoats grama have decreased, and production of mid- and tall warm-season grasses is also reduced. This plant community is moderately resistant to change. The herbaceous species present are well adapted to grazing; however, species composition could be altered through long-term overgrazing. If the herbaceous component is intact, it tends to be resilient if the disturbance was not long-term.
Figure 16. 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 | 1480 | 1828 | 2125 |
| Forb | 110 | 230 | 375 |
| Shrub/Vine | 110 | 230 | 375 |
| Tree | 0 | 12 | 25 |
| Total | 1700 | 2300 | 2900 |
Figure 17. Plant community growth curve (percent production by month). SD6101, Black Hills Foot Slopes, cool-season dominant. Cool-season dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 4 | 12 | 25 | 36 | 10 | 5 | 4 | 4 |
Pathway 2.1A
Community 2.1 to 2.2
Continuous seasonal grazing which includes grazing at moderate to heavy stocking levels at the same time of year each year, continuous season-long grazing, or long-term light grazing will shift this community (2.1) to the Western Wheatgrass-Bluegrass-Annual Brome Plant Community (2.2).
Pathway 2.1B
Community 2.1 to 2.3
Continuous season-long grazing, long-term light grazing, or excessive haying; or non-use and no fire will shift this plant community (2.1) to the Western Wheatgrass-Smooth Brome-Bluegrass Plant Community (2.3).
Pathway 2.2A
Community 2.2 to 2.1
Prescribed grazing (alternating season of use and providing adequate recovery periods) or periodic light to moderate grazing possibly including periodic rest will convert this plant community (2.2) to the Wheatgrass-Bluestem-Non-Native Cool-Season Grass (< 15%) Plant Community (2.1). Prescribed burning may also help facilitate this recovery.
Conservation practices
| Prescribed Burning | |
|---|---|
| Prescribed Grazing |
Pathway 2.2B
Community 2.2 to 2.3
Excessive haying, or non-use and no fire for extended periods of time will result in an increase of the invasive cool-season grasses and result in the transition of this plant community (2.2) to the Western Wheatgrass-Smooth Brome-Bluegrass Plant Community (2.3).
Pathway 2.3A
Community 2.3 to 2.1
Prescribed grazing (alternating season of use and providing adequate recovery periods) or periodic light to moderate grazing possibly including periodic rest will convert this plant community (2.3) to the Wheatgrass-Bluestem-Needlegrass-Non-Native Cool-Season Grass (< 15%) Plant Community (2.1). Prescribed burning to suppress the non-native cool-season grass may also be a management option to facilitate this recovery.
Conservation practices
| Prescribed Burning | |
|---|---|
| Prescribed Grazing |
Pathway 2.3B
Community 2.3 to 2.2
Heavy continuous grazing (stocking levels well above carrying capacity for extended portions of the growing season) or excessive haying will convert this plant community (2.3) to the Western Wheatgrass-Bluegrass-Annual Brome Plant Community (2.2).
State 3
Invaded State
This state is the result of invasion and dominance of non-native cool-season grass species. This state is characterized by the dominance of smooth brome, Kentucky bluegrass, and an increasing thatch layer that effectively blocks introduction of other plants into the system. Heavy grazing, long-term light grazing (understocked), or excessive haying will tend to result in an increase of smooth brome. Non-use and no fire will tend to benefit Kentucky bluegrass due to an increasing thatch layer that effectively blocks the introduction of other plants into the system. Plant litter accumulation tends to favor the more shade-tolerant introduced grass species. The nutrient cycle is also impaired, and the result is typically a higher level of nitrogen which also favors the introduced species. Increasing plant litter decreases the amount of sunlight reaching plant crowns thereby shifting competitive advantage to shade-tolerant introduced grass species. Studies indicate that soil biological activity is altered, and this shift apparently exploits the soil microclimate and encourages growth of the introduced grass species. Once the threshold is crossed, a change in grazing management alone cannot cause a reduction in the invasive grass dominance. Preliminary studies indicate this threshold may exist when Kentucky bluegrass exceeds 30 percent of the plant community and native grasses represent less than 40 percent of the plant community composition. Plant communities dominated by Kentucky bluegrass have significantly less cover and diversity of native grasses and forb species (Toledo, D. et al., 2014). Once the state is well established, even drastic events such as high intensity fires driven by high fuel loads of litter and thatch will not result in more than a very short-term reduction of Kentucky bluegrass. These events may reduce the dominance of Kentucky bluegrass, but due to the large amount of rhizomes in the soil, there is no opportunity for the native species to establish and dominate before Kentucky bluegrass rebounds and again dominates the system.
Community 3.1
Smooth Brome-Kentucky Bluegrass (>30%)
Figure 18. Loamy 18-22" PZ, PCP 3.1
This plant community phase is a result of heavy, continuous season-long grazing, long-term light grazing, or non-use and no fire. It is characterized by a dominance of smooth brome, or Kentucky bluegrass and Canada bluegrass. The dominance is at times so complete that other species are difficult to find on the site. A relatively thick duff layer can sometimes accumulate at or above the soil surface. Nutrient cycling is greatly reduced, and native plants have great difficulty becoming established. Infiltration is greatly reduced, and runoff is high. Production will be significantly reduced when compared to the interpretive plant community (1.1). The period that palatability is high is relatively short, as non-native cool-season grasses mature rapidly. Energy capture is also reduced. Biological activity in the soil is likely reduced significantly in this phase. Along with smooth brome and bluegrass, other species that will be present at varying amounts can include cheatgrass, field brome, and other invasive species that can tolerate repeated heavy grazing. Native species such as western wheatgrass and green needlegrass may be present in minor amounts.
Figure 19. Plant community growth curve (percent production by month). SD6101, Black Hills Foot Slopes, cool-season dominant. Cool-season dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 4 | 12 | 25 | 36 | 10 | 5 | 4 | 4 |
State 4
Early Successional State
This state occurs as a result of extreme disturbance that typically removes most of the native species normally present on this site. Disturbance in the form of severe grazing over several years is the most typical. Occupation by black-tailed prairie dogs may also result in this transition. The dominant species present is highly variable, but the common characteristics include high amounts of bare ground, reduced soil aggregate stability, increased runoff, and increased erosion (including increased sediment loads in the runoff). Restoration of the ecological processes will be very difficult.
Community 4.1
Annual/Pioneer Perennial, Bare Ground
Figure 20. Loamy 18-22" PZ, PCP 4.1
This plant community developed under continuous heavy grazing or other excessive disturbances (e.g., heavy use areas, livestock concentration areas, defoliation by rodents, etc.). The potential plant community is made up of approximately 60 to 80 percent grasses and grass-like species, 15 to 35 percent forbs, and 2 to 5 percent shrubs. The dominant grass is often threeawn. Other grasses may include cheatgrass, field brome, sedge, blue grama, sand dropseed, bluegrass, and western wheatgrass. The dominant forbs include fetid marigold, sweetclover, Cumin ragweed, white sagebrush (cudweed sagewort), and other invader-like species. The dominant shrubs include fringed sagewort, broom snakeweed, and cactus. A wide variety of other early successional plant species can occupy this site in varying amounts. This plant community is susceptible to invasion of Canada thistle and other non-native species because of the relatively high percent of bare ground. Compared to the Bluestem-Wheatgrass-Needlegrass Plant Community (1.1), threeawn, annual bromes, and percent of bare ground has increased. Western wheatgrass, needlegrasses, and other cool-season grasses have decreased, as have the warm-season species including big bluestem, sideoats grama, and little bluestem. Plant diversity is low (plant richness may be high, but areas are often dominated by a few species). The ecological processes are difficult to restore because of the loss of plant diversity and overall soil disturbance. Soil erosion is potentially 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 towards another plant community. This movement is highly variable in its succession. This is due to the loss of diversity (including the loss of the seed bank) within the existing plant community, and the plant communities on adjacent sites.
State 5
Disturbed State
This state can be transitioned to from any plant community. The two separate vegetative plant communities, Go-Back and Seeded, are highly variable in nature. They are derived through different management scenarios and are not related successionally. Infiltration, runoff, and soil erosion will vary depending on the vegetation present on the site. The Go-Back Plant Community (5.1) was previously tilled for crop production and then abandoned. The plant community that develops on this site will be greatly influenced by the plant communities that are located on adjacent land. The Seeded Plant Community (5.2) was typically tilled and then seeded to a perennial forage species or mix of species.
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 the plant community are annual grasses and forbs, later being replaced by both native and introduced perennials. The vegetation on this site varies greatly, sometimes being dominated by threeawn, bluegrass, smooth brome, annual brome, broom snakeweed, sweetclover, and non-native thistles. Other plants that commonly occur on the site can include western wheatgrass, prickly lettuce, horseweed, mullein, kochia, foxtail, and sunflowers. Bare ground is prevalent due to the loss of organic matter and lower overall soil health.
Community 5.2
Seeded
Resilience management. The Seeded Plant Community is normally those areas seeded to pubescent or intermediate wheatgrass, alfalfa, switchgrass, or other forage species. For adapted species and expected production, refer to the USDA-NRCS eFOTG for the appropriate Forage Suitability Group description.
Transition T1A
State 1 to 2
Heavy continuous season-long grazing; long-term light grazing; or no use and no fire; and the invasion of non-native cool-season grasses will transition the Reference State (1.0) to the Native/Invaded State (2.0).
Transition T6A
State 1 to 5
Heavy disturbance including soil erosion; tillage; abandoned cropland; or seeding to improved pasture species results in a transition to the Disturbed State (5.0).
Transition T2A
State 2 to 3
Heavy, continuous season-long grazing, long-term light grazing, or excessive haying will transition the Native/Invaded State 2.0) to the Invaded State (3.0). With extended periods of non-use and no fire, heavy litter layer build-up will favor cool-season non-natives grasses such as Kentucky bluegrass and other non-native species, and will also transition the Native/Invaded State (2.0) to the Invaded State (3.0).
Transition T2B
State 2 to 4
Heavy, continuous season-long grazing; frequent and severe defoliation; or heavy disturbance will transition the Native/Invaded State (2.0) to the Early Successional State (4.0).
Transition T6A
State 2 to 5
Heavy disturbance including soil erosion; tillage; abandoned cropland; or seeding to improved pasture species result in a transition to the Disturbed State (5.0).
Restoration pathway R3A
State 3 to 2
Prescribed burning, followed by long-term prescribed grazing (moderate stocking levels coupled with adequate recovery periods, or other grazing systems such as high-density, low-frequency intended to treat specific species dominance, or periodic light to moderate stocking levels possibly including periodic rest) may lead the Invaded State (3.0) to the Native/Invaded State (2.0). Herbaceous weed control (i.e., herbicide) may also be needed to suppress the non-native cool-season grass. This will likely take a long period of time, and recovery may not be attainable. Overall success depends on whether native reproductive propagules remain intact on the site.
Conservation practices
| Prescribed Burning | |
|---|---|
| Prescribed Grazing | |
| Herbaceous Weed Control |
Transition T3A
State 3 to 4
Heavy, continuous season-long grazing; frequent and severe defoliation; or heavy disturbance will transition the Invaded State (3.0) to the Early Successional State (4.0).
Transition T6A
State 3 to 5
Heavy disturbance including soil erosion; tillage; abandoned cropland; or seeding to improved pasture species result in a transition to the Disturbed State (5.0).
Transition T4A
State 4 to 3
Removal of disturbances; herbaceous weed control; followed by prescribed grazing that includes proper stocking, change in season of use, and deferment that provides time for adequate recovery; and the invasion of non-native cool-season perennial gasses will likely transition the Early Successional State (4.0) to the Invaded State (3.0).
Conservation practices
| Prescribed Burning | |
|---|---|
| Prescribed Grazing |
Transition T6A
State 4 to 5
Heavy disturbance including soil erosion; tillage; abandoned cropland; or seeding to improved pasture species results 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 | Tall Warm-Season Grasses | 300–750 | ||||
| big bluestem | ANGE | Andropogon gerardii | 300–750 | – | ||
| Indiangrass | SONU2 | Sorghastrum nutans | 30–150 | – | ||
| switchgrass | PAVI2 | Panicum virgatum | 0–90 | – | ||
| 2 | Rhizomatous Wheatgrass | 300–750 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 300–600 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–300 | – | ||
| 3 | Cool-Season Bunchgrass | 300–600 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 150–450 | – | ||
| green needlegrass | NAVI4 | Nassella viridula | 150–450 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 30–300 | – | ||
| Columbia needlegrass | ACNE9 | Achnatherum nelsonii | 0–150 | – | ||
| porcupinegrass | HESP11 | Hesperostipa spartea | 0–60 | – | ||
| Canada wildrye | ELCA4 | Elymus canadensis | 0–60 | – | ||
| 4 | Mid- Warm-Season Grasses | 300–600 | ||||
| sideoats grama | BOCU | Bouteloua curtipendula | 150–450 | – | ||
| little bluestem | SCSC | Schizachyrium scoparium | 60–300 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 30–150 | – | ||
| prairie dropseed | SPHE | Sporobolus heterolepis | 0–60 | – | ||
| 5 | Grass-likes | 60–150 | ||||
| needleleaf sedge | CADU6 | Carex duriuscula | 30–150 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–150 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 30–90 | – | ||
| 6 | Other Native Grasses | 60–150 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 30–150 | – | ||
| Grass, perennial | 2GP | Grass, perennial | 0–150 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 30–90 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–90 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–90 | – | ||
| 7 | Non-Native Cool-Season Grasses | 0 | ||||
|
Forb
|
||||||
| 8 | Forbs | 150–450 | ||||
| Forb, perennial | 2FP | Forb, perennial | 30–120 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 30–90 | – | ||
| prairie clover | DALEA | Dalea | 30–90 | – | ||
| scurfpea | PSORA2 | Psoralidium | 30–90 | – | ||
| goldenrod | SOLID | Solidago | 30–60 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 30–60 | – | ||
| beardtongue | PENST | Penstemon | 30–60 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 30–60 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 30–60 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 30–60 | – | ||
| American vetch | VIAM | Vicia americana | 30–60 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 30–60 | – | ||
| false boneset | BREU | Brickellia eupatorioides | 30–60 | – | ||
| western marbleseed | ONBEO | Onosmodium bejariense var. occidentale | 30–60 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 30–60 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 30–60 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 30–60 | – | ||
| wild bergamot | MOFI | Monarda fistulosa | 0–30 | – | ||
| western wallflower | ERAS2 | Erysimum asperum | 0–30 | – | ||
| fleabane | ERIGE2 | Erigeron | 0–30 | – | ||
| four o'clock | MIRAB | Mirabilis | 0–30 | – | ||
| cinquefoil | POTEN | Potentilla | 0–30 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–30 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–30 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 150–300 | ||||
| leadplant | AMCA6 | Amorpha canescens | 30–120 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 30–90 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–60 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 30–60 | – | ||
| rose | ROSA5 | Rosa | 30–60 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–60 | – | ||
| pricklypear | OPUNT | Opuntia | 0–30 | – | ||
| silver sagebrush | ARCA13 | Artemisia cana | 0–30 | – | ||
| American plum | PRAM | Prunus americana | 0–30 | – | ||
|
Tree
|
||||||
| 10 | Trees | 0–30 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–30 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–30 | – | ||
Table 10. Community 2.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Tall Warm-Season Grasses | 50–375 | ||||
| big bluestem | ANGE | Andropogon gerardii | 50–375 | – | ||
| Indiangrass | SONU2 | Sorghastrum nutans | 0–50 | – | ||
| switchgrass | PAVI2 | Panicum virgatum | 0–25 | – | ||
| 2 | Rhizomatous Wheatgrass | 375–750 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 375–750 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–375 | – | ||
| 3 | Cool-Season Bunchgrass | 250–625 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 125–500 | – | ||
| green needlegrass | NAVI4 | Nassella viridula | 125–375 | – | ||
| Columbia needlegrass | ACNE9 | Achnatherum nelsonii | 0–125 | – | ||
| porcupinegrass | HESP11 | Hesperostipa spartea | 0–125 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–125 | – | ||
| Canada wildrye | ELCA4 | Elymus canadensis | 0–50 | – | ||
| 4 | Mid- Warm-Season Grasses | 125–375 | ||||
| sideoats grama | BOCU | Bouteloua curtipendula | 50–250 | – | ||
| little bluestem | SCSC | Schizachyrium scoparium | 50–250 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–75 | – | ||
| prairie dropseed | SPHE | Sporobolus heterolepis | 0–20 | – | ||
| 5 | Grass-likes | 50–125 | ||||
| needleleaf sedge | CADU6 | Carex duriuscula | 25–125 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–125 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 25–75 | – | ||
| 6 | Other Native Grasses | 50–125 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 25–125 | – | ||
| Grass, perennial | 2GP | Grass, perennial | 0–125 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 25–75 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–50 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–50 | – | ||
| 7 | Non-Native Cool-Season Grasses | 125–375 | ||||
| smooth brome | BRIN2 | Bromus inermis | 25–250 | – | ||
| Kentucky bluegrass | POPR | Poa pratensis | 25–125 | – | ||
| crested wheatgrass | AGCR | Agropyron cristatum | 0–125 | – | ||
| cheatgrass | BRTE | Bromus tectorum | 25–75 | – | ||
| field brome | BRAR5 | Bromus arvensis | 0–75 | – | ||
| timothy | PHPR3 | Phleum pratense | 0–75 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 125–250 | ||||
| Forb, introduced | 2FI | Forb, introduced | 0–125 | – | ||
| Forb, perennial | 2FP | Forb, perennial | 25–75 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 25–75 | – | ||
| scurfpea | PSORA2 | Psoralidium | 25–75 | – | ||
| goldenrod | SOLID | Solidago | 25–50 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 25–50 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 25–50 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 25–50 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 25–50 | – | ||
| false boneset | BREU | Brickellia eupatorioides | 0–50 | – | ||
| western marbleseed | ONBEO | Onosmodium bejariense var. occidentale | 0–50 | – | ||
| prairie clover | DALEA | Dalea | 25–50 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 25–50 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 25–50 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 25–50 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 25–50 | – | ||
| American vetch | VIAM | Vicia americana | 25–50 | – | ||
| cinquefoil | POTEN | Potentilla | 0–25 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–25 | – | ||
| fleabane | ERIGE2 | Erigeron | 0–25 | – | ||
| four o'clock | MIRAB | Mirabilis | 0–25 | – | ||
| wild bergamot | MOFI | Monarda fistulosa | 0–25 | – | ||
| western wallflower | ERAS2 | Erysimum asperum | 0–25 | – | ||
| beardtongue | PENST | Penstemon | 0–25 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–25 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 125–250 | ||||
| western snowberry | SYOC | Symphoricarpos occidentalis | 25–100 | – | ||
| leadplant | AMCA6 | Amorpha canescens | 25–75 | – | ||
| rose | ROSA5 | Rosa | 25–50 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 25–50 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–50 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–50 | – | ||
| pricklypear | OPUNT | Opuntia | 0–25 | – | ||
| silver sagebrush | ARCA13 | Artemisia cana | 0–25 | – | ||
| American plum | PRAM | Prunus americana | 0–25 | – | ||
|
Tree
|
||||||
| 10 | Trees | 0–25 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–25 | – | ||
| Rocky Mountain juniper | JUSC2 | Juniperus scopulorum | 0–25 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–25 | – | ||
Table 11. Community 2.2 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Tall Warm-Season Grasses | 0–95 | ||||
| big bluestem | ANGE | Andropogon gerardii | 0–95 | – | ||
| 2 | Rhizomatous Wheatgrass | 95–570 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 95–570 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–285 | – | ||
| 3 | Cool-Season Bunchgrass | 57–190 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 38–190 | – | ||
| green needlegrass | NAVI4 | Nassella viridula | 19–152 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–57 | – | ||
| porcupinegrass | HESP11 | Hesperostipa spartea | 0–38 | – | ||
| 4 | Mid- Warm-Season Grasses | 19–95 | ||||
| sideoats grama | BOCU | Bouteloua curtipendula | 19–95 | – | ||
| little bluestem | SCSC | Schizachyrium scoparium | 0–95 | – | ||
| 5 | Grass-likes | 95–285 | ||||
| needleleaf sedge | CADU6 | Carex duriuscula | 38–190 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 19–95 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–95 | – | ||
| 6 | Other Native Grasses | 95–285 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 38–190 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 19–76 | – | ||
| Grass, perennial | 2GP | Grass, perennial | 0–76 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–19 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–19 | – | ||
| 7 | Non-Native Cool-Season Grasses | 95–475 | ||||
| Kentucky bluegrass | POPR | Poa pratensis | 95–285 | – | ||
| crested wheatgrass | AGCR | Agropyron cristatum | 0–190 | – | ||
| cheatgrass | BRTE | Bromus tectorum | 38–190 | – | ||
| field brome | BRAR5 | Bromus arvensis | 0–95 | – | ||
| smooth brome | BRIN2 | Bromus inermis | 0–95 | – | ||
| timothy | PHPR3 | Phleum pratense | 0–19 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 95–190 | ||||
| white sagebrush | ARLU | Artemisia ludoviciana | 19–76 | – | ||
| goldenrod | SOLID | Solidago | 19–57 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 19–57 | – | ||
| Forb, perennial | 2FP | Forb, perennial | 0–57 | – | ||
| Forb, introduced | 2FI | Forb, introduced | 19–57 | – | ||
| scurfpea | PSORA2 | Psoralidium | 19–57 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 19–38 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 19–38 | – | ||
| wild bergamot | MOFI | Monarda fistulosa | 0–19 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 0–19 | – | ||
| prairie clover | DALEA | Dalea | 0–19 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 0–19 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 0–19 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 0–19 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–19 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 0–19 | – | ||
| false boneset | BREU | Brickellia eupatorioides | 0–19 | – | ||
| western marbleseed | ONBEO | Onosmodium bejariense var. occidentale | 0–19 | – | ||
| American vetch | VIAM | Vicia americana | 0–19 | – | ||
| cinquefoil | POTEN | Potentilla | 0–19 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–19 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 95–190 | ||||
| prairie sagewort | ARFR4 | Artemisia frigida | 19–95 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 19–76 | – | ||
| rose | ROSA5 | Rosa | 19–38 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–38 | – | ||
| pricklypear | OPUNT | Opuntia | 0–38 | – | ||
| leadplant | AMCA6 | Amorpha canescens | 0–19 | – | ||
| silver sagebrush | ARCA13 | Artemisia cana | 0–19 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–19 | – | ||
|
Tree
|
||||||
| 10 | Trees | 0–19 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–19 | – | ||
| Rocky Mountain juniper | JUSC2 | Juniperus scopulorum | 0–19 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–19 | – | ||
Table 12. Community 2.3 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Tall Warm-Season Grasses | 23–230 | ||||
| big bluestem | ANGE | Andropogon gerardii | 23–230 | – | ||
| switchgrass | PAVI2 | Panicum virgatum | 0–23 | – | ||
| 2 | Rhizomatous Wheatgrass | 230–690 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 230–690 | – | ||
| thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–230 | – | ||
| 3 | Cool-Season Bunchgrass | 115–345 | ||||
| green needlegrass | NAVI4 | Nassella viridula | 115–345 | – | ||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 23–184 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–115 | – | ||
| Canada wildrye | ELCA4 | Elymus canadensis | 0–69 | – | ||
| Columbia needlegrass | ACNE9 | Achnatherum nelsonii | 0–46 | – | ||
| porcupinegrass | HESP11 | Hesperostipa spartea | 0–46 | – | ||
| 4 | Mid- Warm-Season Grasses | 23–115 | ||||
| little bluestem | SCSC | Schizachyrium scoparium | 0–92 | – | ||
| sideoats grama | BOCU | Bouteloua curtipendula | 23–69 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–23 | – | ||
| 5 | Grass-likes | 23–115 | ||||
| needleleaf sedge | CADU6 | Carex duriuscula | 23–92 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–69 | – | ||
| sun sedge | CAINH2 | Carex inops ssp. heliophila | 0–46 | – | ||
| 6 | Other Native Grasses | 46–115 | ||||
| Grass, perennial | 2GP | Grass, perennial | 0–115 | – | ||
| blue grama | BOGR2 | Bouteloua gracilis | 23–92 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 23–46 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–23 | – | ||
| Sandberg bluegrass | POSE | Poa secunda | 0–23 | – | ||
| 7 | Non-Native Cool-Season Grasses | 230–690 | ||||
| smooth brome | BRIN2 | Bromus inermis | 115–575 | – | ||
| Kentucky bluegrass | POPR | Poa pratensis | 115–460 | – | ||
| crested wheatgrass | AGCR | Agropyron cristatum | 0–230 | – | ||
| cheatgrass | BRTE | Bromus tectorum | 23–184 | – | ||
| timothy | PHPR3 | Phleum pratense | 23–184 | – | ||
| field brome | BRAR5 | Bromus arvensis | 0–92 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 115–345 | ||||
| Forb, introduced | 2FI | Forb, introduced | 23–115 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 23–69 | – | ||
| Forb, perennial | 2FP | Forb, perennial | 23–69 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 23–69 | – | ||
| goldenrod | SOLID | Solidago | 23–69 | – | ||
| American vetch | VIAM | Vicia americana | 23–46 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 23–46 | – | ||
| wild bergamot | MOFI | Monarda fistulosa | 0–46 | – | ||
| prairie clover | DALEA | Dalea | 23–46 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 23–46 | – | ||
| scurfpea | PSORA2 | Psoralidium | 23–46 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 23–46 | – | ||
| western wallflower | ERAS2 | Erysimum asperum | 0–23 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–23 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 0–23 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 0–23 | – | ||
| cinquefoil | POTEN | Potentilla | 0–23 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–23 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 0–23 | – | ||
| false boneset | BREU | Brickellia eupatorioides | 0–23 | – | ||
| western marbleseed | ONBEO | Onosmodium bejariense var. occidentale | 0–23 | – | ||
| fleabane | ERIGE2 | Erigeron | 0–23 | – | ||
| four o'clock | MIRAB | Mirabilis | 0–23 | – | ||
| purple locoweed | OXLA3 | Oxytropis lambertii | 0–23 | – | ||
| beardtongue | PENST | Penstemon | 0–23 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 115–345 | ||||
| western snowberry | SYOC | Symphoricarpos occidentalis | 23–230 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 23–92 | – | ||
| rose | ROSA5 | Rosa | 23–69 | – | ||
| silver sagebrush | ARCA13 | Artemisia cana | 0–69 | – | ||
| American plum | PRAM | Prunus americana | 0–46 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–46 | – | ||
| leadplant | AMCA6 | Amorpha canescens | 0–46 | – | ||
| Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–46 | – | ||
| pricklypear | OPUNT | Opuntia | 0–23 | – | ||
|
Tree
|
||||||
| 10 | Trees | 0–23 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–23 | – | ||
| Rocky Mountain juniper | JUSC2 | Juniperus scopulorum | 0–23 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–23 | – | ||
Interpretations
Animal community
Wildlife Interpretations:
MLRA 61 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 61, the Loamy 18-22” PZ ecological site provides upland grassland cover with an associated forb component. It was typically part of an expansive grassland landscape that included combinations of Clayey, Shallow, Stony Hills, Overflow, Subirrigated, and Terrace ecological sites.
This site provides 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 Loamy 18-22” PZ ecological site has remained relatively 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 Kentucky bluegrass, smooth brome, and annual bromes have impacted the biological integrity of the site for some grassland birds. Changes in historic fire regime and domestic grazing have impacted the forb/shrub/grass percentages.
Grazing Interpretations:
The following list provides annual suggested initial stocking rates with average growing conditions. These are conservative estimates that should be used only as guidelines in the initial stages of conservation planning. Often, 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 carrying capacity estimates 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. With consultation of the land manager, more intensive grazing management may result in improved harvest efficiencies and increased carrying capacity.
The following initial suggested stocking rates are based on 912 lbs./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: Bluestem-Wheatgrass-Needlegrass (1.1)
Average Production (lb/acre, air-dry): 3,000
Stocking Rate (AUM/acre): 0.82
Plant Community: Western Wheatgrass-Bluestem-Needlegrass-Non-Native Cool-Season Grasses (<15%) (2.1)
Average Production (lb/acre, air-dry): 2,500
Stocking Rate (AUM/acre): 0.69
Plant Community: Western Wheatgrass-Bluegrass-Annual Brome (2.2)
Average Production (lb/acre, air-dry): 1,900*
Stocking Rate (AUM/acre): 0.52*
Plant Community: Western Wheatgrass-Smooth Brome-Bluegrass (2.3)
Average Production (lb/acre, air-dry): 2,300*
Stocking Rate (AUM/acre): 0.63*
Plant Community: Smooth Brome-Kentucky Bluegrass (>30%) (3.1)
Average Production (lb/acre, air-dry): 1,600*
Stocking Rate (AUM/acre): 0.44*
Plant Community: All other plant communities identified in this document will have variable annual production values and will require on-site sampling to determine suggested initial stocking rates.
* Total annual production and stocking rates are highly variable and will require on-site sampling.
Total annual production on-site 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 will likely be lacking protein to meet livestock requirements and added protein will allow 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 groups B. 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. Dominance by blue grama, buffalograss, bluegrass, or smooth brome will result in reduced infiltration and increased runoff. 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 for hydrologic soil groups, runoff quantities, and hydrologic curves, Part 630.)
Recreational uses
This site provides hunting, hiking, photography, bird watching, and other opportunities. The wide variety of plants that bloom from spring until fall have an 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 the it meets the 2014 NESH standards for a provisional ecological site description.
This ESD is an updated “Previously Approved” ESD that represented a first-generation tier of documentation that, prior to the release of the 2014 National Ecological Site Handbook (NESH), met all requirements as an “Approved” ESD as laid out in the 1997 National Range and Pasture Handbook (NRPH). The document fully described the reference state and community phase in the state-and-transition model. All other alternative states are at least described in narrative form. The “Previously Approved” ESD has been field-tested for a minimum of 5 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 continued refinement toward an “Approved” status is expected.
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 document.
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 include: Stan Boltz, Range Management Specialist, NRCS; Cynthia Englebert, Range Management Specialist, Forest Service; George Gamblin, Range Management Specialist, NRCS; Ryan Murray, Range Management Specialist, NRCS; Cheryl Nielsen, Range Management Specialist, NRCS; L. Michael Stirling, Range Management Specialist, NRCS; Jim Westerman, Soil Scientist, NRCS.
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).
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife Service FWS/OBS-79/31.
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).
High Plains Regional Climate Center, University of Nebraska. 2018. http://www.hprcc.unl.edu/ (accessed 6 April 2018).
Larson, Gary E. and James 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.
U.S. Department of Agriculture, Natural Resources Conservation Service. 2018. Electronic field office technical guide. https://efotg.sc.egov.usda.gov (accessed 24 September 2018).
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 20 December 2018).
Soil Survey Staff. 2018. Web Soil Survey. USDA Natural Resources Conservation Service. https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx (accessed 20 December 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. 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. 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. 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. 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. 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 27 December 2018).
U.S. Department of Agriculture, Natural Resources Conservation Service. 2007. National engineering handbook, part 654. Rosgen Stream Classification Technique – Supplemental Materials, Technical Supplement 3E. https://directives.sc.egov.usda.gov/OpenNonWebContent.aspx?content=17833.wba (accessed 4 March 2019).
Vore Buffalo Jump Foundation. 2019. Vore Buffalo Jump. https://www.vorebuffalojump.org/content/ (accessed 20 June 2019).
Contributors
Stan C. Boltz
Rick L. Peterson
Approval
Suzanne Mayne-Kinney, 7/17/2024
Acknowledgments
All ecological sites were written to the Provisional Level by Rick L. Peterson, ESS, Rapid City, SSO in FY20.
The ESDs were reviewed for quality control by Emily Helms, John Hartung, Mitch Faulkner, and Ryan Murray.
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 |
|---|---|
| Contact for lead author | Stan Boltz, stanley.boltz@sd.usda.gov, 605-352-1236 |
| Date | 09/30/2009 |
| Approved by | Suzanne Mayne-Kinney |
| Approval date | |
| Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
Rills should not be present. -
Presence of water flow patterns:
None, or barely visible and discontinuous. -
Number and height of erosional pedestals or terracettes:
Essentially, non-existent. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground less than 5 percent and patches less than 2 inches in diameter. -
Number of gullies and erosion associated with gullies:
Active gullies should not be present. -
Extent of wind scoured, blowouts and/or depositional areas:
None. -
Amount of litter movement (describe size and distance expected to travel):
Little to no plant litter movement. Plant litter remains in place and is not moved by erosional forces. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil aggregate stability rating usually 6. Typically high root content, organic matter, and granular structure. Soil surface is very resistant to erosion. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Soil surface structure is typically granular, and mollic (higher organic matter) colors of A-horizon about 5 to 10 inches deep. If conditions are other than this, refer to map unit component descriptions for component on which the site occurs. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Healthy, deep rooted native grasses enhance infiltration and reduce runoff. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
No compaction layer should be evident. -
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:
Tall, warm-season grasses = wheatgrass (mid, cool-season grasses) >Sub-dominant:
Mid and tall, cool-season bunchgrasses = mid, warm-season grasses >Other:
Forbs > shrubs > grass-like speciesAdditional:
Other grasses occur in other functional groups in minor amounts. -
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Very little to no evidence of decadence or mortality. Bunch grasses have strong, healthy centers and shrubs are vigorous. -
Average percent litter cover (%) and depth ( in):
80 to 90 percent plant litter cover, roughly 0.5 to 1 inch depth. Litter cover is in contact with soil surface. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Ranges from 2,200 to 3,800 pounds/acre. Reference value is 3,000 pounds/acre (air-dry weight basis). -
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:
Refer to State and Local Noxious Weed List; also Kentucky bluegrass, smooth bromegrass. -
Perennial plant reproductive capability:
All species exhibit high vigor relative to climatic conditions. Do not rate based solely on seed production. Perennial grasses typically have vigorous rhizomes or tillers.
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