Natural Resources
Conservation Service
Ecological site EX043B23A120
Limy Upland (LiU) Absaroka Lower Foothills
Last updated: 3/04/2024
Accessed: 11/13/2024
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.
MLRA notes
Major Land Resource Area (MLRA): 043B–Central Rocky Mountains
43B – Central Rocky Mountains – The Central Rocky Mountains extends from northern Montana to southern extent of Wyoming and from Idaho to central Wyoming. The southern extent of 43B is comprised of a combination of metamorphic, igneous, and sedimentary mountains and foothills. Climatic changes across this extent are broad and create several unique breaks in the landscape.
Further information regarding MLRAs, refer to: United States 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. U.S. Department of Agriculture Handbook 296.
Available electronically at: http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_053624#handbook.
LRU notes
Land Resource Unit (LRU) 43B23A: Absaroka Lower Foothills
Based on the shifts in geology, precipitation patterns and other climatic factors, as well as elevations and vegetation, the Absaroka Range was divided into LRU 23. Further division of this LRU is necessary due to the gradient moving from the foothills to the summit, as well as aspect shifts (north/east face versus south/west face). Subset A is set for the lower elevations within the foothills with 10 to 14 inches of precipitation. To verify or identify the LRU A (the referenced LRU for this ecological site), refer to the Wyoming LRU matrix key contained within the Ecological Site Key. This particular LRU occurs along the eastern lower foothills of the Absaroka Range. This LRU starts north of Clark, WY and runs to the Thermopolis, WY area. Once the foothills cross into the Northern Beartooth Range, the climatic patterns and elevational changes shifts the plant community and allows for a break in LRU's near the Montana state line. As the LRU follows to the south and tracks east with the intersection of the Absaroka and Owl Creek Ranges, the face changes aspect and geology creating a shift in plant dynamics and a break in the LRU. The extent of soils currently correlated to this ecological site does not fit within the digitized boundary. Many of the noted soils are provisional and will be reviewed and corrected in mapping update projects. Other map units are correlated as small inclusions within other MLRA’s/LRU’s based on elevation, landform, and biological references.
Moisture Regime: Aridic Ustic or Ustic Aridic – Progressive Initial mapping has shown that soil correlations completed prior to 2014 were identified as ustic aridic, after further evaluation of climatic and soil taxonomy information the proper moisture regime is aridic ustic. Both are recorded here until an update project is completed to correct the previous correlations.
Temperature Regime: Frigid
Dominant Cover: Rangeland – Sagebrush Steppe (major species is Wyoming Big Sagebrush)
Representative Value (RV) Effective Precipitation: 10-14 inches (254 – 355 mm)
RV Frost-Free Days: 80-110 days
Classification relationships
Relationship to Other Established Classification Systems:
National Vegetation Classification System (NVC):
3 Xeromorphic Woodland, Scrub & Herb Vegetation Class
3.B Cool Semi-Desert Scrub & Grassland Subclass
3.B.1 Cool Semi-Desert Scrub & Grassland formation
3.B.1.NE Western North American Cool Semi-Desert Scrub & Grassland Division
M169 Great Basin & Intermountain Tall Sagebrush Shrubland & Steppe Macrogroup
G302 Artemisia Tridentata - Artemisia tripartita - Purshia tridentata Big Sagebrush Steppe Group
CEGL001535 - Artemisia tridentata ssp. wyomingensis/Pseudoroegneria spicata Herbaceous Vegetation or
CEGL001009 - Artemisia tridentata ssp. wyomingensis/Pseudoroegneria spicata Shrubland
Ecoregions (EPA):
Level I: 10 North American Deserts Level II: 10.1 Cold Deserts
Level III: 10.1.18 Wyoming Basin
Level IV: 10.1.18.b Big Horn Basin and
10.1.18.d Foothills and Low Mountains
Ecological site concept
• Site does not receive any additional water.
• Slope is less than 20 percent.
• Soils are:
o not saline or saline-sodic.
o moderately deep, deep, or very deep
o with less than 3 percent stone and boulder cover and less than 20 percent cobble and gravel cover.
o not skeletal within 20 inches of the mineral soil surface.
o are strongly or violently effervescent starting in surface mineral 4” (10 cm).
o textures usually range from very fine sandy loam to clay loam in surface mineral 4”.
o Clay content is less than 32 percent in surface mineral 4 inches of mineral soil.
o Average particle size class is less than 35 percent clays.
The concept of this site is based on the presence of secondary or possibly primary carbonates that exist throughout the entire profile of a soil (strong to violent effervescent starting in the upper 4 inches (10 cm) of the profile), but that does not have a calcic diagnostic horizon (a pronounced accumulation of carbonates usually identified as a white horizon that is harder or slightly cemented). A similar separation from this site is the loamy calcareous site, which lacks the effervescence in the beginning of the profile but has developed a calcic horizon; it has many of the same characteristics and responses as the limy. These two sites may become one site over time, but currently are being reviewed as two distinctively different sites. These sites previously were correlated as a Loamy Ecological Site and the site concept was built to absorb the variations in vegetation. But with further review, it is seen that they predominately have a bluebunch plant community and with mismanagement or corrected management, respond in a different manor or more specifically with a different potential than what we see with the Loamy ecological site. Further soils testing is needed to continue to clarify the distinctions in these ecological breaks.
Associated sites
EX043B23A109 |
Cobbly Upland (CoU) Absaroka Lower Foothills Cobbly Upland will be found intermixed with the above mentioned ecological sites as well as Limy Upland in the alluvial deposits on relict stream terraces, strath terraces, and similar landforms. |
---|---|
EX043B23A123 |
Loamy Calcareous (LyCa) Absaroka Lower Foothills Loamy Calcareous is found in lower or more concave positions where the calcium carbonates have shifted lower in the profile. In some instances, the carbonates have been flushed lower, or deposition has occurred to bury the carbonates deeper in the profile. |
EX043B23A121 |
Limy Skeletal (LiSk) Absaroka Lower Foothills Limy skeletal will be located in gravel or cobble alluvial deposits (relict or strath terraces), bands of limy skeletal and limy upland can be found, especially on fans originating from the dolomite/limestone formations in the Bighorn and Rattlesnake mountain ranges. |
Similar sites
EX043B23A123 |
Loamy Calcareous (LyCa) Absaroka Lower Foothills Loamy Calcareous supports higher productivity, higher composition of Wyoming big versus black sagebrush, and more cover overall than Limy Upland. |
---|---|
EX043B23A122 |
Loamy (Ly) Absaroka Lower Foothills Loamy and Limy Upland have similar soil characteristics with one major difference, that is the significant presence of calcium carbonate in the soils. Loamy has no or minimal carbonates (CCE of less than 14) and Limy Upland will have a CCE 15 or greater starting within 4 inches (10 cm) of the soil surface. |
EX043B23A162 |
Shallow Loamy (SwLy) Absaroka Lower Foothills Shallow Loamy will have a similar plant community dominated by bluebunch wheatgrass, however, Shallow Loamy generally does not have the carbonates in the soil and is a shallower soil (less than 20 inches to bedrock or paralithic contact). The potential forbs and sagebrush health also varies between these sites. (SwLy has healther sage, and more forbs; LiU has short droughty sagebrush and a small diversity of forbs and other grasses.) |
Table 1. Dominant plant species
Tree |
Not specified |
---|---|
Shrub |
(1) Artemisia nova |
Herbaceous |
(1) Pseudoroegneria spicata |
Legacy ID
R043BX520WY
Physiographic features
This site occurs on nearly level to gently rolling land and on slopes less than 20 percent. The Limy Upland ecological site is found on the gently sloping summits of erosional remnants or fan remnants that flow from the mountains across the foothills into the basin proper, but are found on several landforms. This site occurs in a patch-work dynamic because of the alluvial processes that formed these landforms, with sediments derived from carbonate rich parent material, across the landscape.
Table 2. Representative physiographic features
Landforms |
(1)
Foothills
> Eroded fan remnant
(2) Foothills > Alluvial fan (3) Foothills > Colluvial apron |
---|---|
Runoff class | Negligible to high |
Elevation | 5,200 – 7,500 ft |
Slope | 25% |
Aspect | Aspect is not a significant factor |
Climatic features
Annual precipitation and modeled relative effective annual precipitation ranges from 10 to 14 inches (254 – 355 mm). The normal precipitation pattern shows peaks in May and June and a secondary peak in September. This amounts to about 50% of the mean annual precipitation. Much of the moisture that falls in the latter part of the summer is lost by evaporation and much of the moisture that falls during the winter is lost by sublimation. Average snowfall is about 20 inches annually. Wide fluctuations may occur in yearly precipitation and result in more dry years than those with more than normal precipitation.
Temperatures show a wide range between summer and winter 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 winter and bring rapid rises in temperature. Extreme storms may occur during the winter, but most severely affect ranch operations during late winter and spring. High winds are generally blocked from the basin by high mountains, but can occur in conjunction with an occasional thunderstorm. Growth of native cool-season plants begins about April 15th and continues until about July 1st. Cool weather and moisture in September may produce some green up of cool season plants that will continue through late October.
Review of a 30 year trend of data for Average Temperature as well as Average Precipitation, there has been a warming trend, but as the last 12 years graphed, the temperatures have swayed high and low, but overall it has maintained a steady trajectory, neither increasing nor decreasing. Where on the moisture side, the trajectory in trend has been a slow decline. The swings of when spring warm up and first frost hit with the decline in average precipitation have produced a drought effect where the moisture is not being received when the plants and ground is able to utilize the moisture. And in some cases, the late precipitation has encouraged the warm season or mat forming species over the cool season bunchgrasses that are the drivers of the natural system. Early frosts, with dry open winters has created a more arid or desert effect on plants resulting in high rates of winter kill, loss of vigor or overall damage to the plant.
For detailed information visit the Natural Resources Conservation Service National Water and Climate Center at http://www.wcc.nrcs.usda.gov/. “Buffalo Bill Dam", "Cody 21SW", "Thermopolis", "Thermopolis 9NE", "Thermopolis 25WNW" and "Wapiti 1NE" are the representative weather stations within LRU D. The following graphs and charts are a collective sample representing the averaged normals and 30 year annual rainfall data for the selected weather stations from 1981 to 2010.
Table 3. Representative climatic features
Frost-free period (characteristic range) | 66-109 days |
---|---|
Freeze-free period (characteristic range) | 108-145 days |
Precipitation total (characteristic range) | 11-13 in |
Frost-free period (actual range) | 65-119 days |
Freeze-free period (actual range) | 103-147 days |
Precipitation total (actual range) | 10-13 in |
Frost-free period (average) | 88 days |
Freeze-free period (average) | 124 days |
Precipitation total (average) | 12 in |
Figure 1. Monthly precipitation range
Figure 2. Monthly minimum temperature range
Figure 3. Monthly maximum temperature range
Figure 4. Monthly average minimum and maximum temperature
Figure 5. Annual precipitation pattern
Figure 6. Annual average temperature pattern
Climate stations used
-
(1) BUFFALO BILL DAM [USC00481175], Cody, WY
-
(2) WAPITI 1NE [USC00489467], Cody, WY
-
(3) CODY 21 SW [USC00481855], Cody, WY
-
(4) THERMOPOLIS 25WNW [USC00488888], Thermopolis, WY
-
(5) THERMOPOLIS [USC00488875], Thermopolis, WY
-
(6) THERMOPOLIS 9NE [USC00488884], Thermopolis, WY
Influencing water features
The characteristics of these upland soils have no influence from ground water (water table below 60 inches (150 cm)) and have minimal influence from surface water/overland flow. There may be isolated features that are affected by snow pack that persists longer than surrounding areas due to position on the landform (shaded/protected pockets). High concentrations of calcium carbonates in the soil restrict infiltration and available water, creating a drier soil profile and drought appearance in the vegetation naturally.
Soil features
The soils of this site are moderately deep to very deep (greater than 20” to bedrock), moderately well to well drained, and moderately slow to moderate permeability. The soil characteristic having the most influence on the plant community is available moisture and slow infiltration/percolation through the soil due to high levels of calcium carbonate in the soil profile. The potential to develop soluble salt near the surface is also a concern in this profile. More data is needed to quantify these characteristics specifically for this site.
Major Soil Series correlated to this site include: Coyoteflats-like
Figure 7. Soils pit hand excavated in the Limy Upland ecological site.
Table 4. Representative soil features
Parent material |
(1)
Slope alluvium
–
igneous, metamorphic and sedimentary rock
(2) Residuum – limestone and dolomite (3) Colluvium |
---|---|
Surface texture |
(1) Gravelly, cobbly sandy loam (2) Silt loam (3) Sandy clay loam (4) Clay loam |
Family particle size |
(1) Fine-loamy |
Drainage class | Well drained |
Permeability class | Moderately slow to moderate |
Soil depth | 20 in |
Surface fragment cover <=3" | 20% |
Surface fragment cover >3" | 15% |
Available water capacity (0-40in) |
2.7 – 8.3 in |
Calcium carbonate equivalent (0-40in) |
5 – 30% |
Electrical conductivity (0-40in) |
4 mmhos/cm |
Sodium adsorption ratio (0-40in) |
13 |
Soil reaction (1:1 water) (0-40in) |
7.4 – 8.6 |
Subsurface fragment volume <=3" (Depth not specified) |
15% |
Subsurface fragment volume >3" (Depth not specified) |
10% |
Ecological dynamics
The Limy Upland ecological site was originally correlated as either a loamy or shallow loamy range site. During the review of the Loamy range site, several representative reference community site visited was found to have calcareous characteristics. Historically, classification of the soils in the Big Horn Basin and adjoining foothills did not recognize the calcareous tendencies. Although this site is very similar to the Loamy and Shallow Loamy range sites, the community potential and system resilience are altered by the chemistry within the soil. Initial correlations of these soils and communities were made to Loamy when production was prominent, or to Shallow loamy due to the dominance of Bluebunch wheatgrass and reduced production expressing a “shallow” acting characteristic. Wyoming big sagebrush, although present on this site, is generally restricted in vigor and production compared to a true Loamy ecological site. No research specific to the Limy Upland ecological site has been located.
Potential vegetation on this site, as with the Loamy site, is dominated by mid cool-season perennial grasses. Other significant vegetation includes winterfat and black sagebrush, and a variety of forbs. The expected potential composition for this site is 75% grasses, 15% forbs, and 10% woody plants. The composition and production will vary due to historic use, fluctuating precipitation, and altered disturbance regimes.
As this site deteriorates species such as threadleaf sedge, Sandberg bluegrass, and rubber rabbitbrush will increase. Plainsprickly pear and weedy annuals will invade. Cool-season grasses such as bluebunch wheatgrass, rhizomatous wheatgrasses, needle and thread, and Indian ricegrass will decrease in frequency and production.
Due to the amount and pattern of the precipitation, in combination with soil limitations, the black sagebrush component has a lower vigor and overall structure than Wyoming big sagebrush and similar ecological sites within the same area. Sagebrush may not be resilient once it has been removed or severely reduced if a vigorous stand of grass exists and is maintained. Threadleaf sedge becomes the dominant vegetation under frequent and severe periods of grazing, especially continuous year-long grazing; resulting in a dense sod cover of threadleaf sedge.
Within the inherent variability across the landscape, a small population of salt tolerant species is accepted on the Limy Upland ecological sites. Re-evaluation of soil characteristics has led to the removal of the salt tolerant state within this ecological site dynamic. Shadscale is a common shrub within the Limy Upland ecological site. A dominance of salt tolerant shrubs compared to sagebrush warrants a review of the soil characteristics and possibly require a re-correlation of the soils and ecological site.
The reference plant community (description follows the plant community diagram) has been determined by study of relic rangeland sites, or areas protected from excessive disturbance. Trends in plant communities going from heavily grazed areas to lightly grazed areas, seasonal use pastures, and historical accounts have also been used.
The following is a State and Transition Model (STM) Diagram for this ecological site. An STM has five fundamental components: states, transitions, restoration pathways, community phases and community pathways. The state, designated by the bold box, is a single community phase or suite of community phases. The reference state is recognized as State 1. It describes the ecological potential and natural range of variability resulting from the natural disturbance regime of the site. The designation of alternative states (State 2, etc) in STMs denotes changes in ecosystem properties that cross a certain threshold.
Transitions are represented by the arrows between states moving from a higher state to a lower state (State 1 - State 2) and are denoted in the legend as a “T” (T1-2). They describe the variables or events that contribute directly to loss of state resilience and result in shifts between states. Restoration pathways are represented by the arrows between states returning back from a lower state to a higher state (State 2 - State1 or better illustrated by State 1
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
T1-2 | - | Severe and frequent grazing (continuous season-long or year-long) with drought encourages the sod-forming species to establish and then out-compete the more desirable mid-stature cool-season bunchgrasses. |
---|---|---|
T1-3 | - | Grazing impacts to the herbaceous cover weakens and eventually removes the grasses from the community leaving a mixed shrub community. |
T1-4 | - | Disturbances such as season-long continuous grazing, drought, or fire with a seed source present provides invasive species the opportunity to establish in the Reference State. |
T2-4 | - | Drought or surface impact will provide the niche for invasive species to establish and transition the sod-former community to an Invaded State. |
R3-1 | - | Long-term grazing management with incorporation of rest to allow recovery with assistance with seeding of desirable species are needed to restore this community. |
T3-4 | - | Drought and canopy disturbance with seed sources present encourages the transition to the Invaded State. |
R4-5 | - | Integrated pest management, long-term grazing management with seeding is required to reclaim or restore to a non-invaded state. |
T5-4 | - | The lack of management or seeding failure allow the re-invasion of this site. |
State 1 submodel, plant communities
CP1.1-1.2 | - | Frequent and severe grazing and drought will drive this community to a short-stature grass dominated community. |
---|---|---|
CP1.2-1.1 | - | Prescribed grazing with rest allows recovery of the desired herbaceous cover returning this community to reference, with time. |
State 2 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
CP4.1-4.2 | - | Drought, frequent and severe use, or fire can remove the desired natives and leave an invader dominated community. |
---|
State 5 submodel, plant communities
CP5.1-5.2 | - | Seeding, integrated pest management, and prescribed grazing with time improves degraded lands to a reclaimed community. |
---|---|---|
CP5.2-5.1 | - | Lack of management, seeding failure or further disturbance will revert this site to a degraded community phase. |
State 1
Bunchgrass/Sagebrush
The Reference State holds a healthy mix of bluebunch wheatgrass, needle and thread, as well as Indian ricegrass, rhizomatous wheatgrasses, and a minor extent of the sod-former threadleaf sedge. The high calcium carbonates in the soils reduces the differences between coarser textured soils to finer textured soils. A minor shift between Indian ricegrass and threadleaf sedge to needle and thread and western wheatgrass does occur between sandier textures to clay loam textures. The lack of significant distinction limits the ability to separate the two communities into individual ecological sites, so the range of plant composition will capture this characteristic within the plant community tables.
Characteristics and indicators. The reference state is characterized by the dominance of bluebunch wheatgrass, at 50% or less composition by weight, with sagebrush at 10% or less composition by weight. The droughty nature of these soils reduces the plant cover and maintains a higher level of bare ground than a soil with no chemistry. Lichen is a common soil cover that is found to indicate elevated levels of carbonates in the soil.
Resilience management. Although bluebunch wheatgrass and sagebrush are resilient species, they are at-risk when subjected to continuous season-long or year-long grazing. Once they are removed from a community they can be difficult to recover.
Community 1.1
Bluebunch Wheatgrass/Needle and thread/Sagebrush
This plant community is the interpretive plant community for this site and is considered to be the Reference Plant Community. This state evolved with grazing by large herbivores. The fire role on this site is reduced by the lack of dense cover to carry a fire; although not a major role, there is still a risk for fire in this community following a year with high productivity. This plant community can be found on areas that are properly managed with grazing with areas receiving occasional short periods of rest. The potential vegetation is about 75% grasses or grass-like plants, 15% forbs, and 10% woody plants. This state is dominated by cool season mid-grasses. The major grasses include bluebunch wheatgrass, needle and thread, and Indian ricegrass. Rhizomatous wheatgrasses (Montana, Western, and Thickspike) are intermediate grasses on this community. Other grasses occurring in this state include prairie junegrass, needleleaf sedge, and Sandberg bluegrass. Sagebrush is a conspicuous element of this state, occurring in a mosaic pattern, and making up 5 to 10% of the annual production. Black sagebrush is dominant, but small areas of Wyoming big sagebrush will occur. Winterfat and fringed sagewort are a common component found on this site. A variety of forbs also occurs in this state and plant diversity is high (see Plant Composition Table). The total annual production (air-dry weight) of this state is about 400 lbs./acre, but it can range from about 250 lbs./acre in unfavorable years to about 600 lbs./acre in above average years.
Resilience management. This plant community is extremely stable and well adapted to the Central Rocky Mountains foothill climatic conditions. The diversity in plant species allows for high drought tolerance. This is a sustainable plant community (site/soil stability, watershed function, and biologic integrity).
Dominant plant species
-
black sagebrush (Artemisia nova), shrub
-
winterfat (Krascheninnikovia lanata), shrub
-
Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), shrub
-
bluebunch wheatgrass (Pseudoroegneria spicata), grass
-
needle and thread (Hesperostipa comata), grass
-
Montana wheatgrass (Elymus albicans), grass
-
milkvetch (Astragalus), other herbaceous
-
spiny phlox (Phlox hoodii), other herbaceous
-
tapertip hawksbeard (Crepis acuminata), other herbaceous
-
prairie sagewort (Artemisia frigida), other herbaceous
Dominant resource concerns
-
Sheet and rill erosion
-
Ephemeral gully erosion
-
Compaction
-
Aggregate instability
-
Plant productivity and health
-
Plant structure and composition
Figure 9. 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 | 195 | 275 | 350 |
Shrub/Vine | 50 | 100 | 200 |
Forb | 5 | 25 | 50 |
Total | 250 | 400 | 600 |
Table 6. Soil surface cover
Tree basal cover | 0% |
---|---|
Shrub/vine/liana basal cover | 0% |
Grass/grasslike basal cover | 0% |
Forb basal cover | 0% |
Non-vascular plants | 0% |
Biological crusts | 0-10% |
Litter | 10-25% |
Surface fragments >0.25" and <=3" | 0-20% |
Surface fragments >3" | 0-15% |
Bedrock | 0% |
Water | 0% |
Bare ground | 15-30% |
Table 7. Canopy structure (% cover)
Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
---|---|---|---|---|
<0.5 | – | 0-10% | 0-10% | 0-5% |
>0.5 <= 1 | – | 5-15% | 10-50% | 0-10% |
>1 <= 2 | – | 0-5% | 0-20% | 0-2% |
>2 <= 4.5 | – | – | 0-2% | – |
>4.5 <= 13 | – | – | – | – |
>13 <= 40 | – | – | – | – |
>40 <= 80 | – | – | – | – |
>80 <= 120 | – | – | – | – |
>120 | – | – | – | – |
Figure 10. Plant community growth curve (percent production by month). WY0701, 10-14E upland sites.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
J | F | M | A | M | J | J | A | S | O | N | D |
5 | 25 | 40 | 10 | 5 | 10 | 5 |
Community 1.2
Perennial Grasses/Sagebrush
The Perennial Grasses/Sagebrush Community Phase is found under moderate, season-long grazing by livestock and will be exacerbated by prolonged drought conditions. Historically, this plant community evolved under grazing and a low fire frequency. The plant community maintains a cool-season grass dominant component, while tillering sedges and miscellaneous forbs account for the balance of the understory. Black sagebrush is now a conspicuous part of the overall production and accounts for the majority of the over story. Rubber rabbitbrush and Wyoming big sagebrush to a lower degree, may be present in the overstory. Sagebrush can make up to 25% of the annual production. The dominant grass is bluebunch wheatgrass, with rhizomatous wheatgrasses, Sandberg bluegrass, needleleaf sedge, and threadleaf sedge increasing on the site. Forbs commonly found in this plant community include scarlet globemallow, salsify, fringed sagewort, and spiny phlox. The over story of sagebrush and understory of grasses and forbs provide a diverse plant community. Plains pricklypear cactus will be present, but occurs in small isolated patches. Indian ricegrass and needle and thread have decreased and may occur in only trace amounts under the sagebrush canopy or within cactus clumps. Winterfat is common, but different seasons and species of use will reduce its vigor. The total annual production (air-dry weight) of this state is about 450 pounds per acre, but it can range from about 250 lbs./acre in unfavorable years to about 700 lbs./acre in above average years.
Resilience management. Rangeland Health Implications/Indicators: This plant community is resilient, but is subject to change. The herbaceous species present are well adapted to grazing; however, species composition can be altered through improper management and disturbance causing decadence and decrease in vigor of the vegetative cover. The herbaceous component is mostly intact and plant vigor and replacement capabilities are sufficient. Water flow patterns and litter movement may be occurring but only on steeper slopes. Incidence of pedestalling is minimal. Soils are mostly stable and the surface shows minimum soil loss. The watershed is functioning and the biotic community is intact.
Dominant plant species
-
black sagebrush (Artemisia nova), shrub
-
winterfat (Krascheninnikovia lanata), shrub
-
rubber rabbitbrush (Ericameria nauseosa), shrub
-
Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), shrub
-
Sandberg bluegrass (Poa secunda), grass
-
bluebunch wheatgrass (Pseudoroegneria spicata), grass
-
Montana wheatgrass (Elymus albicans), grass
-
western wheatgrass (Pascopyrum smithii), grass
-
scarlet globemallow (Sphaeralcea coccinea), other herbaceous
-
plains pricklypear (Opuntia polyacantha), other herbaceous
-
woolly plantain (Plantago patagonica), other herbaceous
-
yellow salsify (Tragopogon dubius), other herbaceous
Dominant resource concerns
-
Sheet and rill erosion
-
Compaction
-
Aggregate instability
-
Plant productivity and health
-
Plant structure and composition
Figure 13. 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 | 150 | 250 | 350 |
Shrub/Vine | 95 | 175 | 300 |
Forb | 5 | 25 | 50 |
Total | 250 | 450 | 700 |
Table 9. Soil surface cover
Tree basal cover | 0% |
---|---|
Shrub/vine/liana basal cover | 0% |
Grass/grasslike basal cover | 0% |
Forb basal cover | 0% |
Non-vascular plants | 0% |
Biological crusts | 0-10% |
Litter | 10-25% |
Surface fragments >0.25" and <=3" | 0-20% |
Surface fragments >3" | 0-15% |
Bedrock | 0% |
Water | 0% |
Bare ground | 15-40% |
Table 10. Canopy structure (% cover)
Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
---|---|---|---|---|
<0.5 | – | 5-10% | 5-25% | 1-10% |
>0.5 <= 1 | – | 0-20% | 0-30% | 0-10% |
>1 <= 2 | – | 0-5% | 0-5% | 0-5% |
>2 <= 4.5 | – | – | – | – |
>4.5 <= 13 | – | – | – | – |
>13 <= 40 | – | – | – | – |
>40 <= 80 | – | – | – | – |
>80 <= 120 | – | – | – | – |
>120 | – | – | – | – |
Figure 14. Plant community growth curve (percent production by month). WY0501, 5-9BH Upland sites. Monthly percentages of total annual growth for all upland sites with dominantly C3 Cool season plants..
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
J | F | M | A | M | J | J | A | S | O | N | D |
15 | 50 | 20 | 5 | 10 |
Pathway CP1.1-1.2
Community 1.1 to 1.2
Moderate, continuous season-long grazing will convert the plant community to the Perennial Grass/Sagebrush Plant Community. Prolonged drought will exacerbate this transition. The stressers reduce the mid-stature grasses such as bluebunch wheatgrass, needle and thread, Indian ricegrass; allowing the short-statured grasses and sod-formers to increase in dominance in the community.
Pathway CP1.2-1.1
Community 1.2 to 1.1
Prescribed grazing or possibly long-term prescribed grazing, will allow recovery of this plant community to the Reference community. The probability of this occurring is high especially if rotational grazing along with short periods of rest is implemented as part of a prescribed method of use. The limiting soil properties will slow recovery of this site, so change will not occur immediately following implementation of a changed grazing strategy. However, the community will respond to changes in precipitation relatively quickly and with marked differences.
Conservation practices
Brush Management | |
---|---|
Prescribed Burning | |
Grazing Land Mechanical Treatment | |
Integrated Pest Management (IPM) | |
Prescribed Grazing | |
Invasive Plant Species Control |
State 2
Sod-former State
Threadleaf sedge is a sod-forming species that exist as a component of the perennial vegetation naturally (in reference communities) in the ecological site. The general tendency of threadleaf sedge is to increase under grazing pressure, becoming dominant. The alteration of the site by the root mats hinder other native grasses reducing their presence in the community.
Characteristics and indicators. This state is characterized by the dominance of threadleaf sedge and the lack of a most other cool-season bunchgrasses is distinct on the landscape. The lack of sagebrush and increasing cactus cover is also characteristic of the Sod-Former State (State 2).
Resilience management. Threadleaf sedge, a sod-forming species, is hardy and resilient. Once threadleaf sedge has established a dense root-mat the upland sedge is extremely difficult to remove from a site without significant inputs. The dense root mat alters the natural hydrologic process of the community, moving moisture off-site and limiting the potential for other species to recover.
Community 2.1
Threadleaf Sedge/Sagebrush
This plant community is the result of frequent and severe year-long grazing, which has adversely affected the perennial grasses as well as impacted the shrub component. Other factors that can affect the shrubs include drought, heavy browsing, and other surface disturbances. A dense sod of threadleaf sedge dominates this state. Sagebrush has been reduced to small patches, and rubber rabbitbrush is present. When compared to the Reference State (State 1), threadleaf sedge, has increased. Pricklypear cactus has increased. Cool-season mid-stature grasses, forbs, and most shrubs have been greatly reduced. Production has been significantly decreased. The total annual production (air-dry weight) of this state is not available. At this time, sufficient data has not been collected to provide dependable production.
Resilience management. Rangeland Health Implications/Indicators: This community is at risk of losing the shrub component from the plant community. The biotic integrity is not functional and plant diversity is extremely low. The plant vigor is significantly weakened and replacement capabilities are limited due to the reduced number of cool-season grasses. This sod-bound plant community is very resistant to water infiltration. While this sod protects the immediate area, off-site areas are affected by excessive runoff that can cause rills and gully erosion. Water flow patterns are obvious in areas of bare ground and pedestalling is apparent along the sod edges. Rill channels are noticeable in the inter-spaces and down slope. The watershed may or may not be functioning, as runoff may affect adjoining sites.
Dominant plant species
-
black sagebrush (Artemisia nova), shrub
-
winterfat (Krascheninnikovia lanata), shrub
-
rubber rabbitbrush (Ericameria nauseosa), shrub
-
threadleaf sedge (Carex filifolia), grass
-
needleleaf sedge (Carex duriuscula), grass
-
Sandberg bluegrass (Poa secunda), grass
-
plains pricklypear (Opuntia polyacantha), other herbaceous
-
prairie sagewort (Artemisia frigida), other herbaceous
-
yellow salsify (Tragopogon dubius), other herbaceous
-
woolly plantain (Plantago patagonica), other herbaceous
Dominant resource concerns
-
Sheet and rill erosion
-
Ephemeral gully erosion
-
Aggregate instability
-
Drifted Snow
-
Plant productivity and health
-
Plant structure and composition
-
Terrestrial habitat for wildlife and invertebrates
-
Inadequate livestock shelter
Figure 16. Plant community growth curve (percent production by month). WY0504, 5-9 BH Upland Sites Warm Season Dominate. Monthly percentages of total annual growth based on a predominately C4 warm season plant community with shrubs and some C3 plants. Generally sod-forming community..
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 | 0 | 15 | 25 | 45 | 10 | 0 | 5 | 0 | 0 | 0 |
State 3
Sagebrush/Bare Ground State
If continued pressure or disturbance occurs on the vulnerable community within the reference state (State 1), it can be forced into the Sagebrush/Bare Ground State. Over time, drought or grazing pressures on this state will reduce the herbaceous plant cover to occurrences under the woody canopy, of sagebrush or rabbitbrush, and within the protection of pricklypear cactus.
Characteristics and indicators. A sagebrush canopy with limited understory cover is the major characteristic of this community. The lack of herbaceous understory and maturity of the sagebrush and shrub canopy is prominent on the landscape. These factors also create the dominance in production of sagebrush, not specifically an increase in the total number of plants. The change is more of a factor of the closed canopy of mature stands of sagebrush and other shrubs.
Resilience management. Variable climatic patterns and limitations of this calcareous soil hinders plant establishment and vigor. Impact to the herbaceous cover, reducing and potentially removing understory cover, will take time and resources to improve the community. Those species that are able to persist within protective niches in the community influence the recovery potential.
Community 3.1
Sagebrush/Bare Ground
The Sagebrush/Bare Ground Community Phase is the result of drought and frequent and severe (continuous, season-long or year-long) grazing. Sagebrush dominates this plant community, and the preferred cool-season grasses have been greatly reduced. The cool-season grass remnants commonly found in the understory of the sagebrush or within cactus clumps are bluebunch wheatgrass, Sandberg bluegrass, western wheatgrass and six-weeks fescue. The interspaces between plants have expanded leaving the amount of bare ground more prevalent. The open interspaces leave this site vulnerable to weedy annual species, such as Cheatgrass, to occupy the community if a seed source is available. If invasive species gain a foothold, they force the state across a threshold into the Invaded State. The total annual production (air-dry weight) of this state is not available. At this time, sufficient data has not been collected to provide dependable production.
Resilience management. Rangeland Health Implications/Indicators: This plant community is resistant to change as the stand becomes more decadent. These areas may actually be more resistant to fire as less fine fuels are available and the bare ground between the sagebrush plants is increased. Continued frequent and severe grazing does not seem to affect the composition or structure of the plant community. Removal or protection from grazing shows only minor improvement, and any significant change will take time and will be dependent on the seed bank available. Plant diversity is moderate to poor. The plant vigor is diminished and replacement capabilities are limited due to the reduced number of cool-season grasses. Plant litter is noticeably less when compared to reference communities. Soil erosion is accelerated because of increased bare ground. Water flow patterns and pedestalling are obvious. Infiltration is reduced and runoff is increased. Rill channels may be noticeable in the interspaces and gullies may be establishing where rills have concentrated down slope.
Dominant plant species
-
black sagebrush (Artemisia nova), shrub
-
Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), shrub
-
rubber rabbitbrush (Ericameria nauseosa), shrub
-
bluebunch wheatgrass (Pseudoroegneria spicata), grass
-
Sandberg bluegrass (Poa secunda), grass
-
western wheatgrass (Pascopyrum smithii), grass
-
sixweeks fescue (Vulpia octoflora), grass
-
plains pricklypear (Opuntia polyacantha), other herbaceous
-
spiny phlox (Phlox hoodii), other herbaceous
-
woolly plantain (Plantago patagonica), other herbaceous
Dominant resource concerns
-
Sheet and rill erosion
-
Wind erosion
-
Compaction
-
Aggregate instability
-
Plant productivity and health
-
Plant structure and composition
-
Plant pest pressure
-
Feed and forage imbalance
Figure 19. Plant community growth curve (percent production by month). WY0501, 5-9BH Upland sites. Monthly percentages of total annual growth for all upland sites with dominantly C3 Cool season plants..
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
J | F | M | A | M | J | J | A | S | O | N | D |
15 | 50 | 20 | 5 | 10 |
State 4
Invaded State
Invasive plant species are a permanent concern on rangelands and their management. New species are discovered and listed continually, and new methods of treatment are under development that will alter the information in this section. Currently, the foothills within the Big Horn Basin, are prone to cheatgrass, and several varieties of thistles, knapweeds, mustards and others that create a management issue for livestock and ecology. In areas where there has been a disturbance, natural or man-made, these species can gain a place in the landscape and are difficult to impossible to eradicate. Because of this it becomes a battle to maintain control with annual or prolonged management of the weed species, and preventing further shifts or changes to the native composition.
Characteristics and indicators. The significant presence of invasive species (cheatgrass or thistles) or other non-native weedy species within the community is the indication that there has been a shift to this State. Significant is quantified as five percent composition by cover within the community.
Resilience management. The resiliency of most invasive species to persist through significant disturbance create a challenging regime for treatment. Long-term weed management plans are needed to maintain control of many of the invasive species, and eradication is extremely difficult if possible.
Community 4.1
Perennial Grasses/Invasive Species/Sagebrush
The Perennial Grasses/Invasive Species/Sagebrush phase has maintained a representative sample of the perennial grasses and forbs that are typical of the site with the accompanying black sagebrush composition. The invasive species are present and hold a significant (five percent or greater) composition of the landscape, and are prominent on the site (referring to a more wide scale composition, not one isolated patch in an isolated portion of the landscape). Production of the desired perennial species of this site is generally reduced but the total production is maintained or elevated due to the production potential of many of the annual or invasive species.
Resilience management. Rangeland Health Implications/Indicators: This plant community is resistant to change. These areas may be more prone to fire as fine fuels are more available and the bare ground between the sagebrush plants is decreased. Plant diversity is moderate to poor. The plant vigor is diminished and replacement capabilities are limited due to the reduced number of cool-season grasses. Plant litter is noticeably more when compared to reference communities due to the potential biomass produced by the invasive species (species dependent). Soil erosion is variable depending on the species of invasion and the litter accumulation thus associated, this variability also applies to water flow patterns and pedestalling. Infiltration is reduced and runoff is increased due to loss of perennial vegetation and root density.
Dominant plant species
-
black sagebrush (Artemisia nova), shrub
-
rubber rabbitbrush (Ericameria nauseosa), shrub
-
Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), shrub
-
bluebunch wheatgrass (Pseudoroegneria spicata), grass
-
Sandberg bluegrass (Poa secunda), grass
-
cheatgrass (Bromus tectorum), grass
-
plains pricklypear (Opuntia polyacantha), other herbaceous
-
woolly plantain (Plantago patagonica), other herbaceous
-
mustard (Brassica), other herbaceous
-
field cottonrose (Logfia arvensis), other herbaceous
Dominant resource concerns
-
Compaction
-
Aggregate instability
-
Naturally available moisture use
-
Plant productivity and health
-
Plant structure and composition
-
Plant pest pressure
-
Feed and forage imbalance
Figure 20. Plant community growth curve (percent production by month). WY0505, 5-9 BH Upland Sites, Annual Grasses Dominate. Monthly percentages of total annual growth, based on plant communities being affected by annual grasses (cheatgrass) or similar weedy species..
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 | 5 | 25 | 45 | 5 | 0 | 0 | 10 | 5 | 5 | 0 |
Community 4.2
Invasive Species/Sagebrush
Black sagebrush is able to maintain a community under a heavy infestation level unless fire or insect/disease weakens the plant. The canopy of the sagebrush serves as a protected niche in the system that can hold native grass species and help them to persist. But the system is low in resistance and even lower in resilience.
Resilience management. Rangeland Health Implications/Indicators: This plant community is resistant to change as the stand becomes more decadent. These areas may be more prone to fire as fine fuels are more available and the bare ground between the sagebrush plants is decreased. Plant diversity is poor. The plant vigor is diminished and replacement capabilities are limited due to the reduced number of cool-season grasses. Plant litter is noticeably more when compared to reference communities due to the potential biomass produced by the invasive species (species dependent). Soil erosion is variable depending on the species of invasion and the associated litter accumulation. Potential for pedestalling as well as infiltration and runoff is also determined by the species that establishes.
Dominant plant species
-
black sagebrush (Artemisia nova), shrub
-
rubber rabbitbrush (Ericameria nauseosa), shrub
-
Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis), shrub
-
cheatgrass (Bromus tectorum), grass
-
woolly plantain (Plantago patagonica), other herbaceous
-
mustard (Brassica), other herbaceous
-
plains pricklypear (Opuntia polyacantha), other herbaceous
-
field cottonrose (Logfia arvensis), other herbaceous
Dominant resource concerns
-
Compaction
-
Aggregate instability
-
Naturally available moisture use
-
Plant productivity and health
-
Plant structure and composition
-
Plant pest pressure
-
Wildfire hazard from biomass accumulation
-
Feed and forage imbalance
Figure 21. Plant community growth curve (percent production by month). WY0505, 5-9 BH Upland Sites, Annual Grasses Dominate. Monthly percentages of total annual growth, based on plant communities being affected by annual grasses (cheatgrass) or similar weedy species..
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 | 5 | 25 | 45 | 5 | 0 | 0 | 10 | 5 | 5 | 0 |
Pathway CP4.1-4.2
Community 4.1 to 4.2
Frequent or Severe Grazing, Drought, Disturbances (mechanical) and Wildfire – Drought, wildfire, or other climatic stresses on the system can continue to stress the native species reducing their ability to maintain their footprint in the plant community. Complication with mechanical disturbances or, frequent and severe grazing pressure from wildlife and livestock can reduce the natives to an nonviable or unsustainable population and allow the invasive species to dominate the site.
State 5
Degraded State
The Degraded State could be drafted as a stand-alone box within the state and transition model diagram. No matter which a State an ecological site originally is ranked in, once the community is mechanically disturbed, or suffers a catastrophic or significant natural disaster that alters the soil properties (erosional, depositional, hydrological or chemical), the recovery potential is altered. To consider this as an alternate ecological site would not be unreasonable. In some cases (site by site consideration), a re-correlation of a location may be the best solution. But in many cases, a location has not been altered out of the current ecological site concept, but the potential has shifted enough that it is no longer comparable to the reference community. In response to the change in potential and the variability, a dynamic State was captured to detail the altered communities that exist on the landscape.
Characteristics and indicators. The key indication of a transition to this State is the primary successional phase following major soil disturbance, or the presence of introduced species (seeded varieties).
Resilience management. The resiliency and resistance of the established community is a direct relation to the extent of the disturbance/alteration, the species that are established and the maturity of the stand.
Community 5.1
Disturbed Lands
The title Disturbed Lands is encompassing three broad classifications of these land types. Go-back fields are referring to sites that were once cultivated or have had minor surface disturbance, and have since been left to natural processes. Homestead and abandoned farming sites can be identified on the landscape (through color-tone shifts in aerial photographs) and are generally a mix of natives that have moved into disturbed sites or a co-mingling of introduced species and natives. These sites are difficult to reclaim, generally due to the introduced species that persist on the landscape. Reclaimed communities do not respond disturbances the same as a native, mechanically undisturbed site would respond. Mined lands or lands affected by energy development including transmission corridors, transportation corridors and development sites provide a host of successional processes. Many times, these locations are re-exposed to disturbance frequently by mechanical means leaving annual weeds and primary successional species as the dominate canopy. Older, established sites or abandoned locations, have established communities similar to those expected on go-back fields and may be stable in nature. The last type of Disturbed lands are a variety of seeded introduced species. Although this could be considered reclaimed or restored, these communities were seeded to introduced or improved varieties. Many plantings were monocultures, or completed in alternating rows, not in a mixture. Crested wheatgrass was a species used frequently for reclamation throughout Wyoming and many of these communities persist today. Although there are areas where native species from neighboring sites are starting to slowly extend into the crested wheatgrass stands, many times, these stands remain as a monoculture until a disturbance occurs to open the canopy slightly to provide a more tolerable niche. Russian wildrye and varieties of rhizomatous and bunch-wheatgrasses have also been used to help compensate for the chemistry of these soils. Although the success of vegetative seedings are moderate due to unpredictable precipitation events, there are successful re-seeded sites.These communities will transition or mature as the stand density declines with lack of management or inputs, the canopy opens and allows natives, if present, to begin to establish. Although each planting is highly variable on the exact composition that will be present, they appear to be stable and can be productive sites. The growth curve of this plant community will vary depending on the species that are selected for seeding. For a more accurate portrait of the growth curve for the seeded community, the species used and the climatic tendencies of the region must be considered.
Resilience management. Rangeland Health Implications/Indicators: The plant community is variable and depending on the age of the stand and the stage of successional tendencies that the location is in will determine how stable (resilient/resistant) the community is. Plant diversity is generally strong, but is usually lacking in the structural groups that are desired on the site. Soil erosion is variable depending on the disturbance regime that is occurring on the site and again on the specific community that has established on a specific location. The variability of the water flow and pedestalling as well as infiltration and runoff is determined again by the species that establishes on this site.
Community 5.2
Reclaimed Lands
Reclamation practices have shifted greatly over the last several decades from introduced varieties to native seedings. As mentioned in the community phase above, as these introduced seedings mature and the stands open, they can be characteristically similar to a reference community. The current interpretation of the definition of reclaimed or restored communities are seedings of natural occurring species to mimic or mirror the Reference Community Phase as closely as possible. This excludes the use of non-native species and allows for a more similar ecological response than what is expected with non-native species. These seedings will not replicate the reference community in response to management due to the change in soil dynamics. Mechanical disturbance for seedbed preparation and seeding, shifts soil structure, infiltration and potentially water holding capacity affecting their response to management. There are situations where these communities may respond very similar to reference. The growth curve of this plant community will vary depending on the species that are selected as the reclamation seed mix. For a more accurate portrait of the growth curve for the seeded community, the species used and the climatic tendencies of the region must be considered.
Resilience management. Rangeland Health Implications/Indicators: Seeding mixtures will determine the plant community resistant to change and resilience to threat of invasive species and to erosion. Many of the stands established during seeding are diversity poor, but are better than the monocultures that were planned historically. Many seeded sites may be prone to fire as they mature as many of the cultivated seeds produce more biomass (possibly more litter) and thus may create more fine fuels to fuel a fire. Soil erosion is variable depending on the establishment of the seeding, how it is seeded, and mechanical procedures put in place. The variability of the water flow and pedestalling as well as infiltration and runoff is determined again by the species that establishes on this site.
Pathway CP5.1-5.2
Community 5.1 to 5.2
Seeding, Brush Management, Integrated Pest Management, Prescribed grazing management – With the proper mechanical improvements and the follow-up through establishment and then maintenance, a disturbed site can be improved and managed. However, climatic limitations and soil chemistry limit the success of seeding treatments. Depending on the site location, invasive species are a risk to most sites within the lower foothills and create a moderate success potential for this process.
Conservation practices
Critical Area Planting | |
---|---|
Grazing Land Mechanical Treatment | |
Range Planting | |
Heavy Use Area Protection | |
Integrated Pest Management (IPM) | |
Native Plant Community Restoration and Management | |
Prescribed Grazing | |
Invasive Plant Species Control | |
Herbaceous Weed Control |
Pathway CP5.2-5.1
Community 5.2 to 5.1
No use, No Fire, Long Term Prescribed Grazing, Frequent or Severe Grazing. The lack of maintenance of a community or further disturbance by grazing or other, will cause a decline in vigor and a shift in composition. Since the community and soils are altered from the Reference State due to plowing, mining, or other similar disturbances, the plant community will not follow the same expected shifts as a native community and will resemble the disturbed lands plant composition.
Transition T1-2
State 1 to 2
Frequent and severe grazing (yearlong grazing) will convert the plant community to the Sod-Former/Sagebrush State. Drought or the shift in precipitation timing and spring warm up has also encouraged the shift to short-statured sod-forming grasses.
Constraints to recovery. The dense root system of threadleaf sedge is difficult to reduce to allow other native species to establish on a site. The alteration to the hydrologic properties by threadleaf sedge further creates a dry and hostile environment for most mid-stature cool-season grasses.
Transition T1-3
State 1 to 3
Frequent and severe grazing will convert the plant community to the Sagebrush/Bare Ground Plant Community. This conversion is found on areas where the sagebrush stand is not adversely impacted by drought or heavy browsing, but the herbaceous species have been weakened or removed from the system.
Constraints to recovery. The limited or lack of seed sources for the desired mid-stature cool-season bunchgrasses and the natural soil conditions that provide a harsh environment for seed germination restrict the ability for this community to recover.
Transition T1-4
State 1 to 4
Frequent and severe grazing, fire, drought, or disturbance with introduction of a seed source will allow this plant community and any of the states to shift to the Invaded State. There is a high risk of crossing the threshold into the Invaded State, especially with the continued increase of invaders in high traffic areas and the persistence of drought which opens the plant community to aggressive species like cheatgrass.
Constraints to recovery. The difficulty in reducing and inability to eradicate cheatgrass is the main constraint to recovery. The limiting characteristics of the soils also restricts establishment of desirable species.
Transition T2-4
State 2 to 4
Threadleaf sedge has been seen to die back or die out with prolonged drought opening the canopy and the community’s vulnerability to invasive species. Disturbance by mechanical means or human activities that break the root masses or disturb the soil surface provide the potential niche for invasive species to establish, especially when there is a readily available seed source for those invasive species.
Constraints to recovery. The limited ability to eradicate invasive species such as cheatgrass limits the ability for this community to recover.
Restoration pathway R3-1
State 3 to 1
The use of herbivory during the dormant season with the introduction of native seed sources to encourage the re-establishment of grasses to this community is one means of assisting with recovery of the Sagebrush/Bare Ground State. Rest and long-term grazing management are needed to allow the recovery of native species.
Conservation practices
Critical Area Planting | |
---|---|
Prescribed Grazing | |
Grazing Land Mechanical Treatment | |
Range Planting | |
Upland Wildlife Habitat Management | |
Prescribed Grazing | |
Grazing Management Plan |
Transition T3-4
State 3 to 4
A combination of long-term drought or a canopy disturbance will convert the Sagebrush/Bare Ground State to the Invaded State, if an invasive species seed source is present.
Constraints to recovery. The challenge of eradicating or reducing and maintaining an invaded plant community while encourage native species has not been successfully accomplished, especially on these droughty soils.
Restoration pathway R4-5
State 4 to 5
Integrated pest management with an intensive ground treatment to remove/eradicate the invasive species is the first process in restoring this community. The removal of the invasive species is then followed by seeding with long-term grazing management and weed management to restore or reclaim an invaded community to a native community. Success is extremely limited and is only known to have been completed on small scale areas.
Conservation practices
Cover Crop | |
---|---|
Critical Area Planting | |
Prescribed Grazing | |
Grazing Land Mechanical Treatment | |
Range Planting | |
Upland Wildlife Habitat Management | |
Early Successional Habitat Development/Management | |
Invasive Plant Species Control |
Transition T5-4
State 5 to 4
The lack of weed management, further ground disturbance or seeding failure allow the invasive species to re-establish transitioning a reclaimed site back to an invaded state.
Constraints to recovery. The limited capabilities to control invasive species is the main constraint to recovery. However, the limiting characteristics of the soil also inhibit the establishment of native species that could help reduce the threat of invasive species.
Additional community tables
Table 11. Community 1.1 plant community composition
Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
---|---|---|---|---|---|---|
Grass/Grasslike
|
||||||
1 | Mid-stature Cool-season Bunchgrasses | 150–300 | ||||
bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 75–200 | 20–50 | ||
needle and thread | HECO26 | Hesperostipa comata | 25–75 | 5–15 | ||
Indian ricegrass | ACHY | Achnatherum hymenoides | 0–50 | 0–10 | ||
2 | Rhizomatous Wheatgrasses | 10–50 | ||||
Montana wheatgrass | ELAL7 | Elymus albicans | 5–50 | 2–10 | ||
western wheatgrass | PASM | Pascopyrum smithii | 5–50 | 2–10 | ||
thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–10 | 0–5 | ||
3 | Short-stature Cool-season Bunchgrasses | 0–50 | ||||
squirreltail | ELEL5 | Elymus elymoides | 0–25 | 0–5 | ||
Sandberg bluegrass | POSE | Poa secunda | 0–25 | 0–5 | ||
prairie Junegrass | KOMA | Koeleria macrantha | 0–25 | 0–5 | ||
muttongrass | POFE | Poa fendleriana | 0–25 | 0–5 | ||
4 | Miscellaneous Grasses/Grass-likes | 0–25 | ||||
threadleaf sedge | CAFI | Carex filifolia | 0–25 | 0–5 | ||
needleleaf sedge | CADU6 | Carex duriuscula | 0–25 | 0–5 | ||
Grass, perennial | 2GP | Grass, perennial | 0–25 | 0–5 | ||
Forb
|
||||||
5 | Perennial Forbs | 0–50 | ||||
milkvetch | ASTRA | Astragalus | 0–25 | 0–5 | ||
Indian paintbrush | CASTI2 | Castilleja | 0–25 | 0–5 | ||
tapertip hawksbeard | CRAC2 | Crepis acuminata | 0–25 | 0–5 | ||
fleabane | ERIGE2 | Erigeron | 0–25 | 0–5 | ||
leafy wildparsley | MUDI | Musineon divaricatum | 0–25 | 0–5 | ||
spiny phlox | PHHO | Phlox hoodii | 0–25 | 0–5 | ||
scarlet globemallow | SPCO | Sphaeralcea coccinea | 0–25 | 0–5 | ||
Forb, perennial | 2FP | Forb, perennial | 0–25 | 0–5 | ||
Shrub/Vine
|
||||||
6 | Dominant Shrubs | 50–150 | ||||
black sagebrush | ARNO4 | Artemisia nova | 25–150 | 5–15 | ||
Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–50 | 0–10 | ||
winterfat | KRLA2 | Krascheninnikovia lanata | 5–25 | 2–5 | ||
7 | Miscellaneous Shrubs | 0–50 | ||||
prairie sagewort | ARFR4 | Artemisia frigida | 0–25 | 0–5 | ||
rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–25 | 0–5 | ||
Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–25 | 0–5 |
Table 12. Community 1.2 plant community composition
Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
---|---|---|---|---|---|---|
Grass/Grasslike
|
||||||
1 | Mid-stature Cool-season Bunchgrasses | 75–200 | ||||
bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 50–200 | 10–50 | ||
Indian ricegrass | ACHY | Achnatherum hymenoides | 0–25 | 0–5 | ||
needle and thread | HECO26 | Hesperostipa comata | 0–25 | 0–5 | ||
2 | Rhizomatous Wheatgrasses | 0–50 | ||||
Montana wheatgrass | ELAL7 | Elymus albicans | 0–50 | 0–10 | ||
western wheatgrass | PASM | Pascopyrum smithii | 0–50 | 0–10 | ||
thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 0–25 | 0–5 | ||
3 | Short-stature Cool-season Bunchgrasses | 25–75 | ||||
Sandberg bluegrass | POSE | Poa secunda | 20–50 | 5–10 | ||
prairie Junegrass | KOMA | Koeleria macrantha | 0–50 | 0–10 | ||
squirreltail | ELEL5 | Elymus elymoides | 0–20 | 0–5 | ||
muttongrass | POFE | Poa fendleriana | 0–20 | 0–5 | ||
4 | Miscellaneous Grasses/Grass-likes | 0–25 | ||||
sixweeks fescue | VUOC | Vulpia octoflora | 0–20 | 0–5 | ||
Grass, perennial | 2GP | Grass, perennial | 0–20 | 0–5 | ||
threadleaf sedge | CAFI | Carex filifolia | 0–20 | 0–5 | ||
needleleaf sedge | CADU6 | Carex duriuscula | 0–20 | 0–5 | ||
Forb
|
||||||
5 | Perennial Forbs | 0–50 | ||||
milkvetch | ASTRA | Astragalus | 0–20 | 0–5 | ||
bastard toadflax | COUM | Comandra umbellata | 0–20 | 0–5 | ||
tapertip hawksbeard | CRAC2 | Crepis acuminata | 0–20 | 0–5 | ||
fleabane | ERIGE2 | Erigeron | 0–20 | 0–5 | ||
leafy wildparsley | MUDI | Musineon divaricatum | 0–20 | 0–5 | ||
spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–5 | ||
scarlet globemallow | SPCO | Sphaeralcea coccinea | 0–20 | 0–5 | ||
Forb, perennial | 2FP | Forb, perennial | 0–20 | 0–5 | ||
6 | Annual Forbs | 0–25 | ||||
yellow salsify | TRDU | Tragopogon dubius | 0–20 | 0–5 | ||
woolly plantain | PLPA2 | Plantago patagonica | 0–10 | 0–5 | ||
flatspine stickseed | LAOC3 | Lappula occidentalis | 0–10 | 0–5 | ||
Forb, annual | 2FA | Forb, annual | 0–10 | 0–5 | ||
Shrub/Vine
|
||||||
7 | Dominant Shrubs | 75–200 | ||||
black sagebrush | ARNO4 | Artemisia nova | 75–200 | 15–30 | ||
winterfat | KRLA2 | Krascheninnikovia lanata | 0–25 | 0–5 | ||
8 | Miscellaneous Shrubs | 0–100 | ||||
Wyoming big sagebrush | ARTRW8 | Artemisia tridentata ssp. wyomingensis | 0–50 | 0–5 | ||
rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–50 | 0–5 | ||
prairie sagewort | ARFR4 | Artemisia frigida | 0–25 | 0–5 | ||
Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–25 | 0–5 |
Interpretations
Animal community
Animal Community – Wildlife Interpretations:
1.1 - Bluebunch Wheatgrass/Needleandthread/Sagebrush (Reference Community): The predominance of grasses in this plant community favors grazers and mixed-feeders, such as bison, elk, and antelope. Suitable thermal and escape cover for deer may be limited due to the low quantities of woody plants. However, topographical variations could provide some escape cover. When found adjacent to sagebrush dominated states, this plant community may provide brood rearing/foraging areas for sage grouse, as well as lek sites. Other birds that would frequent this plant community include western meadowlarks, horned larks, and golden eagles. Many grassland obligate small mammals would occur here.
1.2 - Bluebunch Wheatgrass/Sandberg Bluegrass/Sagebrush Plant Community: The combination of an overstory of sagebrush and an understory of grasses and forbs provide a very diverse plant community for wildlife. The crowns of sagebrush tend to break up hard crusted snow on winter ranges, so mule deer and antelope may use this state for foraging and cover year-round, as would cottontail and jack rabbits. It provides important winter, nesting, brood-rearing, and foraging habitat for sage grouse. Brewer’s sparrows’ nest in big sagebrush plants and hosts of other nesting birds utilize stands in the 20-30% cover range.
2.1 - Threadleaf Sedge/Sagebrush Plant Community: This community provides limited foraging for antelope and other grazers. They may be used as a foraging site by sage grouse where reference state community phases are limited. Generally, these are not target plant communities for wildlife habitat management.
3.1 - Sagebrush/Bare Ground Plant Community: This plant community can provide important winter foraging for elk, mule deer and antelope, as sagebrush can approach 15% protein and 40-60% digestibility during that time. This community provides excellent escape and thermal cover for large ungulates, as well as nesting habitat for sage grouse.
4.1 - Perennial Grasses/Invasive Species/Wyoming Big Sagebrush Plant Community: The retained combination of sagebrush and the added diversity with the invasive grasses and/or forbs provide an extended plant community for wildlife. The similarities to Community Phase 1.2 are to some extent enhanced for some species with the added forage provided by the invasive species. But as the invasive species increase, decreasing the desirable species, the wildlife species benefits are decreased as well.
4.2 - Invasive Species/Sagebrush Plant Community: Limited nesting and cover is provided by the persistent overstory cover of sagebrush.
5.1 - Disturbed Lands Plant Community and 5.2 - Restored/Reclaimed Lands Plant Community: The variability of this site prevents a detailed review of wildlife benefits. However, many of the introduced grasses, forbs and shrubs can provide adequate cover, feed and nesting sites for those wildlife species that would have selected the site prior to disturbance. Limitations and enhancements need to be considered by specific locations.
Animal Community – Grazing Interpretations:
The following table lists suggested stocking rates for cattle under continuous season-long grazing under normal growing conditions. These are conservative estimates that should be used only as guidelines in the initial stages of the conservation planning process. Often, the current plant composition does not entirely match any particular plant community (as described in this ecological site description). Because of this, a field visit is recommended, in all cases, to document plant composition and production. More precise carrying capacity estimates should eventually be calculated using this information along with animal preference data, particularly when grazers other than cattle are involved. Under more intensive grazing management, improved harvest efficiencies can result in an increased carrying capacity. If distribution problems occur, stocking rates must be reduced to maintain plant health and vigor.
The Carrying capacity is calculated as the production for a normal year X .25 efficiency factor / 912.5 #/AUM to calculate the AUM's/Acre.
Plant Community Production Carrying Capacity*
Plant Community Description/Title: Lbs./Acre AUM/Acre
1.1 Bluebunch Wheatgrass/Needleandthread/Sagebrush 250-400-600 0.11 9.13
1.2 Bluebunch Wheatgrass/Sandberg Bluegrass/Sagebrush 250-450-700 0.12 8.11
2.1 Threadleaf Sedge/Sagebrush ** **
3.1 Sagebrush/Bare Ground ** **
4.1 Perennial Grasses/Invasive Species/Sagebrush ** **
4.2 Invasive Species/Sagebrush ** **
5.1 Disturbed Lands and 5.2 Restored/Reclaimed Lands ** **
* - Carry Capacity is figured for continuous, season-long grazing by cattle under average growing conditions. ** - Sufficient data for invaded and reclaimed communities has not be collected or evaluated, at this time, so no projection of a stocking rate recommendation or production range will be established at this time.
Grazing by domestic livestock is one of the major income-producing industries in the area. Rangeland in this area may provide yearlong forage for cattle, sheep, or horses. During the dormant period, the forage for livestock use needs to be supplemented with protein because the quality does not meet minimum livestock requirements.
Distance to water, shrub density, and slope can affect carrying capacity (grazing capacity) within a management unit. Adjustments should be made for the area that is considered necessary for reduction of animal numbers. For example, 30% of a management unit may have 25% slopes and distances of greater than one mile from water; therefore, the adjustment is only calculated for 30% of the unit (i.e. 50% reduction on 30% of the management unit). Fencing, slope length, management, access, terrain, kind and class of livestock, and breeds are all factors that can increase or decrease the percent of graze-able acres within a management unit. Adjustments should be made that incorporate these factors when calculating stocking rates.
Hydrological functions
Water is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic group B and C, with localized areas in hydrologic group D. Infiltration ranges from moderately slow to moderate. Runoff potential for this site varies from low to moderate depending on soil hydrologic group and ground cover. In many cases, areas with greater than 75% ground cover have the greatest potential for high infiltration and lower runoff. An example of an exception would be where short-grasses form a strong sod and dominate the site. Areas where ground cover is less than 50% have the greatest potential to have reduced infiltration and higher runoff (refer to Part 630, NRCS National Engineering Handbook for detailed hydrology information).
Rills and gullies should not typically be present. Water flow patterns should be barely distinguishable if at all present. Pedestals are only slightly present in association with bunchgrasses. Litter typically falls in place, and signs of movement are not common. Chemical and physical crusts are rare to non-existent. Cryptogamic crusts are present, but only cover 1-2% of the soil surface.
Recreational uses
This site provides hunting opportunities for upland game species. The wide varieties of plants which bloom from spring until fall have an aesthetic value that appeals to visitors. Outside of plants, the extent offers a variety of Culture Resources to view on the landscape based on the location of many of these sites on higher ground on the benches and fans which also provides a rich source of geology for exploration. This ecological site, however, can prove to have limitations when associated with Roadways and Trails in relation to erosion potential and functionality. The soils will be sticky or slick when wet and are more erosive than the Loamy range sites and so consideration needs to be given when crossing these areas with trails and roadways.
Wood products
No appreciable wood products are present on the site.
Other products
Herbs: Several of the forb species within the communities of the Limy Upland ecological site have medicinal characteristics and have been used by the Native Americans in this area and more recently by the naturopathic profession.
Ornamental Species: The forbs commonly found as well as the shrub component of these communities have been used in landscaping and xeriscaping.
Supporting information
Inventory data references
Those involved in the development of the new concept for Loamy, Loamy Calcareous, and Limy Upland ecological sites include: Ray Gullion (Retired) and Blaise Allen, Area Range Management Specialist, NRCS; Jim Wolf, Resource Manager, USDI-BLM; Jack Mononi (Retired), Range Management Specialist, USDI-BLM; Daniel Wood, MLRA Soil Survey Leader, NRCS; Jane Karinen, Soil Data Quality Specialist, NRCS; and Marji Patz, Ecological Site Specialist, NRCS. Other sources used as references include USDA NRCS Water and Climate Center, USDA NRCS National Range and Pasture Handbook, USDI and USDA Interpreting Indicators of Rangeland Health Version IV, and USDA NRCS Soil Surveys from various counties.
Inventory Data References:
Ocular field estimations observed by trained personnel were completed at each site. Then sites were selected where a 100 foot tape was stretched and the following sample procedures were completed by inventory staff. For full sampling protocol and guidelines with forms please refer to the Wyoming ESI Operating Procedures, compiled in 2012 for the Powell and Rock Springs Soil Survey Office, USDA-NRCS.
• Double Sampling Production Data (9.6 hoop used to estimate 10 points, clipped a minimum of 3 of these estimated points, with two 21 foot X 21 foot square extended shrub plots).
• Line Point Intercept (over story and understory captured with soil cover). Height of herbaceous and woody cover is collected every three feet along established transect.)
• Continuous Line Intercept (Woody Canopy Cover, with minimum gap of 0.2 of a foot for all woody species and succulents. Intercept height collected at each measurement.),
• Gap Intercept (Basal Gap measured with a minimum gap requirement of 0.7 foot.),
• Sample Point (10 – 1 meter square point photographs taken at set distances on transect. Red using the sample point computer program established by the High Plains Agricultural Research Center, WY).
• Soil Stability (Slake Test – surface and subsurface samples collected and processed according to the soil stability guidelines provided by the Jornada Research Center, NM.)
Other references
Baker, William L. 2006. Fire and Restoration of Sagebrush Ecosystems. Wildlife Society Bulletin 34(1): 177-185.
Bestelmeyer, B., and J. R. Brown. 2005. State-and-transition models 101: a fresh look at vegetation change. The Quivira Coalition Newsletter, Vol. 7, No. 3.
Bestelmeyer, B., J. R. Brown, K. M. Havstad, B. Alexander, G. Chavez, J. E. Herrick. 2003. Development and use of state and transition models for rangelands. Journal of Range Management 56(2):114-126.
Bestelmeyer, B., J. E. Herrick, J. R. Brown, D. A. Trujillo, and K. M. Havstad. 2004. Land management in the American Southwest: a state-and-transition approach to ecosystem complexity. Environmental Management 34(1):38-51.
Herrick, J. E., J. W. Van Zee, K. M. Havstad, L. M. Burkett, and W. G. Whitford. 2005. Monitoring manual for grassland, shrubland and savanna Ecosystems. Volume I Quick Start. USDA - ARS Jornada Experimental Range, Las Cruces, New Mexico.
Herrick, J. E., J. W. Van Zee, K. M. Havstad, L. M. Burkett, and W. G. Whitford. 2005. Monitoring manual for grassland, shrubland and savanna Ecosystems. Volume II: Design, supplementary methods and interpretation. USDA - ARS Jornada Experimental Range, Las Cruces, New Mexico.
NRCS. 2014. (electronic) National Water and Climate Center. Available online at http://www.wcc.nrcs.usda.gov/
NRCS. 2014. (electronic) Field Office Technical Guide. Available online at http://efotg.nrcs.usda.gov/efotg_locator.aspx?map=WY NRCS. 2009. Plant Guide: Cheatgrass. Prepared by Skinner et al., National Plant Data Center.
Pellant, M., P. Shaver, D. A. Pyke, and J. E. Herrick. 2005. Interpreting indicators of rangeland health. Version 4. Technical Reference 1734-6. USDI-BLM.
Ricketts, M. J., R. S. Noggles, and B. Landgraf-Gibbons. 2004. Pryor Mountain Wild Horse Range Survey and Assessment. USDA-Natural Resources Conservation Service.
Schoeneberger, P. J., D. A. Wysocki, E. C. Benham, and Soil Survey Staff. 2012. Field book for describing and sampling soils, Version 3.0. Natural Resources Conservation Service, National Soil Survey Center, Lincoln, NE. (http://soils.usda.gov/technical/fieldbook/)
Stringham, T. K. and W. C. Krueger. 2001. States, transitions, and thresholds: Further refinement for rangeland applications. Agricultural Experiment Station, Oregon State University. Special Report 1024.
Stringham, T. K., W. C. Kreuger, and P. L Shaver. 2003. State and transition modeling: an ecological process approach. Journal of Range Management 56(2):106-113.
United States Department of Agriculture. Soil Survey Division Staff. 1993. Soil Survey Manual, United States Department of Agriculture Handbook No. 18, Chapter 3: Examination and Description of Soils. Pg.192-196.
USDA, NRCS. 1997. National Range and Pasture Handbook. (http://www.glti.nrcs.usda.gov/technical/publications/nrph.html)
Trlica, M. J. 1999. Grass growth and response to grazing. Colorado State University. Cooperative Extension. Range. Natural Resource Series. No. 6.108.
U.S. Department of Agriculture, Natural Resources Conservation Service (USDA/NRCS). 2007. The PLANTS Database (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
U.S. Department of Agriculture, Natural Resources Conservation Service (USDA/NRCS), Soil Survey Staff. 2010. Keys to Soil Taxonomy, Eleventh Edition, 2010.
USDA/NRCS Soil survey manuals for appropriate counties within MLRA 32X.
Western Regional Climate Center. (2014) (electronic) Station Metadata. Available online at: http://www.wrcc.dri.edu/summary/climsmwy.html.
Contributors
Dan Mattke, Resource Soil Scientist - Rocky Mountain Area Office
Approval
Kirt Walstad, 3/04/2024
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) | Marji Patz |
---|---|
Contact for lead author | marji.patz@usda.gov; 307-271-3130 |
Date | 04/22/2020 |
Approved by | Kirt Walstad |
Approval date | |
Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
Rare to non-existent, but will have an increase of occurrence on steeper slopes of 10-20%. -
Presence of water flow patterns:
Barely observable, but will see a limited extent of flow patterns occurring within the vegetation interspaces on steeper slopes (10-20%) -
Number and height of erosional pedestals or terracettes:
Essentially non-existent, or rare if occurring. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground is 15 to 30% occurring in small patch-like areas throughout site. Interspaces between plant bases has a significant cover of lichen present, accounting for the decrease of bare ground with a decrease in plant cover compared to similar ecological sites. -
Number of gullies and erosion associated with gullies:
Active gullies should not be present. The presence of increased gully activity is a strong indication of a degraded state within this ecological site. -
Extent of wind scoured, blowouts and/or depositional areas:
Rare to non-existent. -
Amount of litter movement (describe size and distance expected to travel):
Little to no plant litter movement occurring. 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):
Plant cover, lichen and litter is at 70% or greater of soil surface and maintains soil surface integrity. Soil stability class is anticipated to be 3.0 or greater on average. Ranging from 1 in interspaces and up to 5 under plant canopy. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Soil data is limited for this site. A-horizons vary in depth from 1 to 8 inches with OM of 1-2%. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Plant community consists of, on average, 75% grasses, 15% forbs, and 10% shrubs. This, with an evenly distributed canopy and litter, with deep healthy rooted native grasses enhancing infiltration, limits the runoff potential to little or no effect on this site. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
No compaction layer or soil surface crusting should 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:
Mid-stature cool-season bunchgrassesSub-dominant:
perennial shrubs = cool-season rhizomatous grassesOther:
perennial forbs > short-stature bunchgrass and grass-likesAdditional:
-
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Minimal decadence noted, typically associated with shrub canopy. Through drought conditions will see some decadence with bluebunch wheatgrass. -
Average percent litter cover (%) and depth ( in):
Litter ranges from 5 to 20% of total canopy with total litter including beneath the plant canopy can reach up to 50%. Herbaceous litter depth typically ranges from 3-10 mm, with woody littler varying between 4-6 cm. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Total normal or average production is estimated at 400 lbs/ac (448 kg/ha); and ranges from 250 to 600 lbs/ac (280-773 kg/ha). -
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:
Sandberg bluegrass, threadleaf sedge, fringed sagewort, pricklypear cactus, broom snakeweed and rubber rabbitbrush are natives that will increase with pressure on this site. A variety of native and non-native annuals such as field cottonrose, mustard, and exotic species found on the noxious weed list including but not limited to: cheatgrass, spotted knapweed, and bull thistle will persist on this site. -
Perennial plant reproductive capability:
All species are capable of reproducing.
Print Options
Sections
Font
Other
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.
Click on box and path labels to scroll to the respective text.
Ecosystem states
T1-2 | - | Severe and frequent grazing (continuous season-long or year-long) with drought encourages the sod-forming species to establish and then out-compete the more desirable mid-stature cool-season bunchgrasses. |
---|---|---|
T1-3 | - | Grazing impacts to the herbaceous cover weakens and eventually removes the grasses from the community leaving a mixed shrub community. |
T1-4 | - | Disturbances such as season-long continuous grazing, drought, or fire with a seed source present provides invasive species the opportunity to establish in the Reference State. |
T2-4 | - | Drought or surface impact will provide the niche for invasive species to establish and transition the sod-former community to an Invaded State. |
R3-1 | - | Long-term grazing management with incorporation of rest to allow recovery with assistance with seeding of desirable species are needed to restore this community. |
T3-4 | - | Drought and canopy disturbance with seed sources present encourages the transition to the Invaded State. |
R4-5 | - | Integrated pest management, long-term grazing management with seeding is required to reclaim or restore to a non-invaded state. |
T5-4 | - | The lack of management or seeding failure allow the re-invasion of this site. |
State 1 submodel, plant communities
CP1.1-1.2 | - | Frequent and severe grazing and drought will drive this community to a short-stature grass dominated community. |
---|---|---|
CP1.2-1.1 | - | Prescribed grazing with rest allows recovery of the desired herbaceous cover returning this community to reference, with time. |
State 2 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
CP4.1-4.2 | - | Drought, frequent and severe use, or fire can remove the desired natives and leave an invader dominated community. |
---|
State 5 submodel, plant communities
CP5.1-5.2 | - | Seeding, integrated pest management, and prescribed grazing with time improves degraded lands to a reclaimed community. |
---|---|---|
CP5.2-5.1 | - | Lack of management, seeding failure or further disturbance will revert this site to a degraded community phase. |