Natural Resources
Conservation Service
Ecological site DX032X01W140
Saline Lowland Drained (SLDr)
Big Horn Basin Wet
Last updated: 10/04/2019
Accessed: 05/21/2026
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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.
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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): 032X–Northern Intermountain Desertic Basins
Major land resource area (MLRA):
032X – Northern Intermountain Desertic Basins – This MLRA is comprised of two major Basins, the Big Horn and Wind River. These two basins are distinctly different and are split by LRU’s to allow individual ESD descriptions. These warm basins are surrounded by uplifts and rimmed by mountains, creating a unique set of plant responses and communities. Unique characteristics of the geology and geomorphology single these two basins out.
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):
32X01W (WY): This LRU is the Big Horn Basin within MLRA 32. This LRU is lower in elevation, slightly warmer and receives slightly less overall precipitation than the Wind River Basin (LRU 02). This LRU was originally divided into two LRU's - LRU A which was the core and LRU B which was the rim. With the most current standards, this LRU is divided into two Subsets. This group is ambiguous of the two official subsets and will be referred to as Subset W, capturing those sites that are a factor of water or other processes outside of the general subset divisions (climate). As the LRU shifts outer edges, aspect and relation to the major bodies of water and taller landforms create minor shifts in soil chemistry influencing the variety of ecological sites and plant interactions. 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: typic aridic, or ustic aridic.
Temperature Regime: Mesic
Dominant Cover: Rangeland, with Saltbush flats the dominant vegetative cover for this MLRA.
Representative Value (RV) Effective Precipitation: 5-14 inches (127 – 355 mm)
RV Frost-Free Days: 105-150 daysClassification 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 Saltbush Scrub Macrogroup
G301 Atriplex corrugate – Artemisia pedatifida – Picrothamnus desertorum Dwarf-Scrub Group
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.g Big Horn Salt Desert Shrub BasinEcological site concept
• Site receives additional moisture from surrounding uplands.
• Site exists along degraded (down-cut) channel systems that have had a significant drop in the water table.
• Slope is < 6%
• Soils are:
o Textures range from sandy loam to clay in top 4” (10 cm) of mineral soil surface, and varies within profile.
o All subsurface horizons in the particle size control section have a weighted average of <18% clay. (The particle size control section is the segment of the profile from either the start of an argillic horizon for 50 cm’s or from 25-100 cm’s).
o Moderately deep to very deep (20-80+ in. (50-200+ cm)
o Not skeletal (<35% rock fragments) within 20” (50 cm) of mineral soil surface, may have stratification with gravels.
o None to Slightly effervescent throughout top 20” (50 cm) of mineral soil surface
o Saline, sodic, or saline-sodic; but this may occur deeper in the profile (within rooting zone of woody species).
These are saline soils found along drainage ways with a water table below rooting depth of woody plants, usually as a result of down cutting or gully erosion. Soils may not have visible salt chemistry, but plants are still indicating a salty environment (greasewood, gardner's saltbush, alkali sacaton, and inland saltgrass).Associated sites
R032XY338WY Saline Lowland (SL) 10-14" East Precipitation Zone
Saline Lowland sites can be found within the active channel where saline lowland, drained are found on the upper banks of the down-cut portions of the channel.
R032XY344WY Saline Upland (SU) 10-14" East Precipitation Zone
Saline Upland are found up slope or a step above the saline lowland drained sites, on positions receiving no additional moisture.
R032XY328WY Lowland (LL) 10-14" East Precipitation Zone
Lowland sites can be found within the active channel and saline lowland, drained sites are found on the upper banks of the down-cut portions of the channel.
R032XY304WY Clayey (Cy) 10-14" East Precipitation Zone
Clayey sites are found up slope or a step above these lowland soils. Clayey also is lacking in the soil chemistry that is or was found in the saline lowland, drained site, on positions receiving no additional moisture.
Similar sites
R032XY240WY Saline Lowland Drained (SLDr) 5-9” Wind River Basin Precipitation Zone
Saline Lowland Drained within the Wind River Basin is lower in production.
Table 1. Dominant plant species
Tree Not specified
Shrub (1) Sarcobatus vermiculatus
(2) Atriplex gardneriHerbaceous (1) Sporobolus airoides
(2) Achnatherum hymenoidesLegacy ID
R032XB140WY
Physiographic features
This site normally occurs on land that receives overflow or runoff from adjacent slopes.
Table 2. Representative physiographic features
Landforms (1) Intermontane basin > Alluvial fan
(2) Intermontane basin > Drainageway
(3) Intermontane basin > Stream terrace
Runoff class Negligible to low Flooding duration Brief (2 to 7 days) Flooding frequency None to occasional Ponding duration Brief (2 to 7 days) Ponding frequency None to rare Elevation 5400 – 7500 ft Slope 0 – 6 % Climatic features
Annual precipitation and modeled relative effective annual precipitation ranges from 5 to 14 inches (127 – 355 mm). The normal precipitation pattern shows peaks in May and June and a secondary peak in September. The noted peaks account for approximately 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 approximately on April 1st and continues through to July 1st. Cool weather and moisture in September may produce some green up of cool season plants that will continue to late October. For detailed information visit the Natural Resources Conservation Service National Water and Climate Center at http://www.wcc.nrcs.usda.gov/. “Basin”, "Clark 3NE", "Cody", "Cody 12SE", "Emblem", "Greybull", "Heart Mtn", “Lovell”, "Powelll Fld Stn", "Worland FAA AP", and “Worland” are the representative weather stations for LRU A. 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) 90-120 days Freeze-free period (characteristic range) 120-140 days Precipitation total (characteristic range) 10-10 in Frost-free period (actual range) 90-120 days Freeze-free period (actual range) 110-150 days Precipitation total (actual range) 10-10 in Frost-free period (average) 110 days Freeze-free period (average) 130 days Precipitation total (average) 10 in Characteristic rangeActual rangeBarLineFigure 2. Monthly precipitation range
Characteristic rangeActual rangeBarLineFigure 3. Monthly minimum temperature range
Characteristic rangeActual rangeBarLineFigure 4. Monthly maximum temperature range
BarLineFigure 5. Monthly average minimum and maximum temperature
Figure 6. Annual precipitation pattern
Figure 7 Annual average temperature pattern
Climate stations used
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(1) LOVELL [USC00485770], Lovell, WY
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(2) EMBLEM [USC00483031], Burlington, WY
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(3) GREYBULL [USC00484080], Greybull, WY
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(4) BASIN [USC00480540], Basin, WY
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(5) WORLAND [USW00024062], Worland, WY
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(6) WORLAND [USC00489770], Worland, WY
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(7) HEART MTN [USC00484411], Powell, WY
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(8) CODY 12SE [USC00481850], Meeteetse, WY
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(9) CLARK 3NE [USC00481775], Powell, WY
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(10) CODY [USC00481840], Cody, WY
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(11) POWELL FLD STN [USC00487388], Powell, WY
">Influencing water features
A degraded or down-cut stream channel has removed the historic water table from this site. Overflow during high spring run-off or snow melt provides additional moisture to this site. Site is generally adjacent to an active channel (ephemeral, intermittent or perennial). There may be instances of this site occurring in an upland position where a perched water table once existed.
Soil features
The soils of this site are moderately deep and very deep poorly to well-drained soils formed in alluvium. These soils have moderate to rapid permeability and are moderately to strongly saline and/or alkaline. Higher soluble salt concentrations may be found in the subsoils. The surface soil will be highly variable and vary from 2 to 8 inches in thickness. A water table if present is below 5 feet and is too deep to benefit the herbaceous species. These areas are subject to occasional overflow. The soil characteristics having the most influence on the plant community are the elimination of the water table near the surface, reduction in the potential to flood and the elevated quantities of soluble salts.
Major Soil Series correlated to this site include: Bunkwater, Lostwells, Fenton-like, Oregon Basin-like, Hiland-like, and ZigweidTable 4. Representative soil features
Parent material (1) Alluvium – sandstone and shale
Surface texture (1) Loam
(2) Clay loam
(3) Silt loam
(4) Clay
(5) Sandy loam
(6) Silty clay
Drainage class Poorly drained to well drained Permeability class Moderate to moderately rapid Soil depth 20 – 60 in Ecological dynamics
**Disclaimer** This PROVISIONAL ecological site was developed for an extended MLRA concept where the foothills (10-14" precipitation Frigid climatic zone) was included in this site. This has created an exaggerated or elevated production value for this site description.
This site occurs as a direct result of a hydrologic disruption to the Saline Lowland 10-14 Foothills and Basins East ecological site (See Saline Lowland Ecological Site Description). This disturbance, whether natural or human caused, alters the hydrologic function of a Saline Lowland to such a degree that rehabilitation is not an option. As a result, subsoil that at one time was sufficiently moist during part of the growing season is literally drained as water is now diverted to deeply incised channels. Consequently, supplemental water that was predictable and available to herbaceous plants during part of the growing year is now lacking and the water table is permanently below the rooting depth of these plants. This site, however, gets occasional overflow from the adjacent uplands and the water table is commonly at a depth that is still beneficial to deep-rooted shrub species.
Potential vegetation on this site is dominated by tall and mid perennial grasses, which can tolerate soils with moderate amounts of salinity and/or alkalinity and adapt to periodic overflows. Other significant vegetation includes greasewood, rubber rabbitbrush, and a variety of forbs. The expected potential composition for this site is about 75% grasses, 10% forbs and 15% woody plants. The composition and production will vary naturally due to historical use, fluctuating precipitation and fire frequency.
As this site deteriorates, species such as inland saltgrass and greasewood will increase. Weedy annuals will invade. Grasses such as alkali sacaton, rhizomatous wheatgrasses, Indian ricegrass and basin wildrye will decrease in frequency and production.
The Historic Climax Plant Community (description follows the plant community diagram) has been determined by study of rangeland relic areas, 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 Diagram that illustrates the common plant communities (states) that can occur on the site and the transitions between these communities. The ecological processes will be discussed in more detail in the plant community narratives following the diagram.
Plant Community Narratives
Following are the narratives for each of the described plant communities. These plant communities may not represent every possibility, but they probably are the most prevalent and repeatable plant communities. The plant composition tables shown above have been developed from the best available knowledge at the time of this revision. As more data is collected, some of these plant communities may be revised or removed, and new ones may be added. None of these plant communities should necessarily be thought of as “Desired Plant Communities”. According to the USDA NRCS National Range and Pasture Handbook, Desired Plant Communities (DPC’s) will be determined by the decision-makers and will meet minimum quality criteria established by the NRCS. The main purpose for including any description of a plant community here is to capture the current knowledge and experience at the time of this revision.State and transition model
Custom diagramStandard diagram
More interactive model formats are also available. View Interactive Models
More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textEcosystem states
State 1 submodel, plant communities
State 2 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
State 5 submodel, plant communities
State 6 submodel, plant communities
State 1
Inland Saltgrass/ Basin Wildrye/ Alkali SacatonCommunity 1.1
Inland Saltgrass/ Basin Wildrye/ Alkali SacatonThe interpretive plant community for this site is the Historic Climax Plant Community. This state evolved with grazing by large herbivores and periodic fires. Potential vegetation is about 75% grasses or grass-like plants, 10% forbs and 15% woody plants. Tall and medium grasses, which can tolerate saline and/or alkali conditions and occasional overflows, dominate this plant community. The major grasses include inland saltgrass, basin wildrye, alkali sacaton, and rhizomatous wheatgrasses, Woody plants include primarily greasewood and Gardner’s saltbush, but rubber rabbitbrush and basin big sagebrush can also occur. 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 900 pounds per acre, but it can range from about 500 lbs./acre in unfavorable years to about 1200 lbs./acre in above average years.
This state is stable and well adapted to the Northern Intermountain Desertic Basins climatic conditions. The diversity in plant species allows for high drought resistance. This is a sustainable plant community (site/soil stability, watershed function, and biologic integrity). Typically, relic rills and gullies are visible but are now stable. No recent accelerated erosion should be occurring in this state.
Transitions or pathways leading to other plant communities are as follows:
• Moderate, continuous season-long grazing will convert this plant community to the Inland Saltgrass/Rhizomatous Wheatgrasses/Greasewood Plant community. Prolonged drought will exacerbate this transition.Figure 8. Annual production by plant type (representative values) or group (midpoint values)
Figure 9. 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 State 2
Inland Saltgrass/ Rhizomatous Wheatgrasses/ GreasewoodCommunity 2.1
Inland Saltgrass/ Rhizomatous Wheatgrasses/ GreasewoodThis plant community evolved under moderate grazing by domestic livestock and low fire frequency. Saline tolerant grasses make up the majority of the understory. The dominant grasses include rhizomatous wheatgrasses, bottlebrush squirreltail, inland saltgrass, alkali bluegrass, blue grama, and alkali sacaton. Forbs commonly found in this plant community include wild onion, pursh seepweed, smooth woodyaster, and povertyweed. Greasewood and Gardner’s saltbush may comprise as much as 20% of the total annual production.
When compared to the Historical Climax Plant Community, basin wildrye, Indian ricegrass, and alkali sacaton have decreased. Inland Saltgrass, blue grama, greasewood and rubber rabbitbrush have increased. Total production is less as the tall and mid-grasses have been reduced.
The total annual production (air-dry weight) of this state is about 700 pounds per acre, but it can range from about 450 lbs./acre in unfavorable years to about 1000 lbs./acre in above average years.
This state is stable and protected from excessive erosion. The herbaceous component is mostly intact and plant vigor and replacement capabilities are sufficient. Only minimal occurrences of water flow patterns and litter movement is evident. Incidence of pedestalling is minimal. Soils are mostly stable and the surface shows minimum soil loss. Typically, relic rills and gullies are visible but are now stable. The watershed is functioning and the biotic community is intact.
Transitional pathways leading to other plant communities are as follows:
• Prescribed grazing or possibly long-term prescribed grazing will result in a plant community very similar to the Historic Climax Plant Community, except that greasewood will persist without a return to a normal fire regime or some form of brush control.
• Frequent and severe grazing and no fire with the occasional overflow will convert this plant community to the Mixed Shrub/Short Grass Sod Plant Community.
• Encroachment and no fire will convert this plant community to the Alkali Sacaton/Saltcedar and/or Russian Olive Plant Community.
• Frequent and Severe grazing plus encroachment will convert this plant community to a Dense Saltcedar and/or Russian Olive Stand/Annuals Plant Community. Invasion of saltcedar or Russian olive should be considered serious and should be controlled.
• Frequent and severe grazing with no overflow and no fire will convert this plant community to the Dense Shrub/Bare Ground Plant Community. Prolonged drought will exacerbate this transition.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 State 3
Mixed Shrub/ Short Grass SodCommunity 3.1
Mixed Shrub/ Short Grass SodThis plant community is the result of frequent and severe grazing with periodic overflows and no fire or brush control. This plant community is dominated by a dense sod of inland saltgrass, blue grama and alkali bluegrass and includes a mosaic shrub overstory. Greasewood and rubber rabbitbrush are the dominant overstory shrubs in this plant community. Shrubs comprise less than 25% of the annual production and are kept in check by the herbaceous sod understory.
When compared to the Historic Climax Plant Community, the tall and medium grasses are absent or greatly reduced. Short warm season grasses are dominant and weedy annuals are common. Shrubs will have increased as a percentage of the total production, but will not dominate as the sod prevents a homogeneous shrub cover. Noxious weeds such as Russian knapweed are present, if a seed source is available. Total production is less as the tall and mid grasses have been removed.
The total annual production (air-dry weight) of this state is about 600 pounds per acre, but it can range from about 350 lbs./acre in unfavorable years to about 800 lbs./acre in above average years.
The sod component of this plant community is extremely resistant to change and continued frequent and severe grazing or the removal of grazing does not seem to affect the plant composition or structure of the plant community. The biotic integrity of this state is minimally functional as plant diversity is moderate to poor especially among the herbaceous species. However, the vegetative structure may still be partially intact as the shrub component is still within a reasonable percentage of the total composition.
This sod bound plant community is very resistant to water infiltration. While this sod protects the site itself, excessive runoff increases erosion on bare ground areas and worsens the channelization already present. Water flow patterns are obvious in the bare ground areas and shrubs and sod patches are pedestalled. Rill channels are noticeable in the interspaces and lateral gullies will increase. The watershed is not minimally functioning, as runoff is excessive and erosional processes are accelerated.
Transitional pathways leading to other plant communities are as follows:
• Grazing land mechanical treatment (chiseling and seeding, etc.) and brush management followed by prescribed grazing and if necessary seeding will return this plant community to near Historic Climax Plant Community.
• Frequent and severe grazing with no overflow will convert this plant community to the Dense Shrub/Bare Ground Sod Plant Community. Prolonged drought will exacerbate this transition.
• Frequent and Severe grazing plus encroachment will convert this plant community to a Dense Saltcedar and/or Russian Olive Stand/Annuals Plant Community. Invasion of saltcedar or Russian olive should be consider serious and should be controlled.Figure 11. 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 State 4
Dense Shrub/ Bare GroundCommunity 4.1
Dense Shrub/ Bare GroundThis plant community evolved under frequent and severe grazing plus a decrease in the number of periodic overflow events and the absence of fire. Drought will exacerbate this transition. Greasewood and rubber rabbitbrush are the dominant species of this plant community. Tall and medium grasses have been eliminated. The interspaces between shrubs have expanded leaving the amount of bare ground more prevalent and more soil surface exposed to erosive elements.
The annual grasses and forbs, such as cheatgrass, foxtail barley, kochia, halogeton, and Russian thistle, make up the dominant understory along with noxious weeds such as Russian knapweed. Total annual production is mostly from shrubs and these weedy annuals. When compared to the HCPC the total production has been reduced but the increase in shrubs offsets some of the loss in the herbaceous production.
The total annual production (air-dry weight) of this state is about 400 pounds per acre, but it can range from about 300 lbs./acre in unfavorable years to about 600 lbs./acre in above average years.
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 shrubs is increased. Continued frequent and severe grazing or the removal of grazing does not seem to affect the plant composition or structure of the plant community. Annual grasses, weedy species and bare ground compromise the biotic integrity. Plant diversity is poor and the potential for native grasses to reproduce is absent. The shift in the vegetative structure and function is extreme and the biotic integrity is lost.
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 lateral gullies are numerous.
Transitional pathways leading to other plant communities are as follows:
• Brush management, followed by prescribed grazing and seeding if necessary, will return this plant community at or near the HCPC. If prescribed fire is used as a means to reduce or remove the shrubs, sufficient fine fuels will need to be present. This may require deferment from grazing prior to treatment. Since both greasewood and rubber rabbitbrush are difficult to remove or control, repeated treatments or a combination of treatments may be necessary. Post management is critical to ensure success. This can range from two or more years of rest to partial growing season deferment, depending on the condition of the understory at the time of treatment and the growing conditions following treatment. In the case of an intense wildfire that occurs when desirable plants are not completely dormant, the length of time required to reach the HCPC may be increased and seeding of natives is recommended.Figure 12. 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 State 5
Alkali Sacaton/Saltcedar and/ or Russian OliveCommunity 5.1
Alkali Sacaton/Saltcedar and/ or Russian OliveThis plant community occurs where saltcedar and/or Russian olive encroaches into the site and becomes established. This occurs with or without grazing and is the result of conditions conducive to the colonization of these to plants. An increase in bare ground is likely to increase the potential for colonization. However, areas that have been deferred or removed from grazing and had a healthy stand of alkali sacaton can be infested. Saline tolerant perennial plants make up the dominant understory species in this plant community.
The dominant grasses include alkali sacaton, inland saltgrass, rhizomatous wheatgrasses, and blue grama. Forbs commonly found in this plant community include wild onion, pursh seepweed, smooth woodyaster, and povertyweed. Saltcedar and/or Russian olive comprise the majority of the woody species and usually make up greater than 35% of the annual production. Invasion of saltcedar or Russian olive should be considered serious and should be controlled.
When compared to the Historical Climax Plant Community, basin wildrye has decreased. Inland Saltgrass has increased and saltcedar and/or Russian olive have invaded. Total production has been reduced but is similar to the Inland Saltgrass/Rhizomatous Wheatgrasses/Greasewood Plant community.
The total annual production (air-dry weight) of this state is about 600 pounds per acre, but it can range from about 400 lbs./acre in unfavorable years to about 900 lbs./acre in above average years.
This plant community is mostly resistant to change, but species composition can be altered through long-term overgrazing and further encroachment of saltcedar and Russian olive. The herbaceous component is stable and plant vigor and replacement capabilities are sufficient. The biotic community is not intact due to the encroachment of these invasive species. Plant diversity is moderate.
Soils are mostly stabilized. Only minimal occurrences of water flow patterns and litter movement is evident. Incidence of pedestalling is minimal. Soils are mostly stable and the surface shows minimum soil loss. The watershed may or may not be functional.
Transitions or pathways leading to other plant communities are as follows:
• Frequent and severe grazing plus Encroachment will convert the plant community to the Dense Saltcedar and/or Russian Olive Stand/Annuals Plant Community.
• Grazing land mechanical treatment, brush management, and prescribed grazing may convert this plant community to the Historic Climax Plant Community, but recovery is mostly impractical as removal of salt cedar and/or Russian olive is expensive and total removal is typically not obtainable. Salt cedar and Russian olive will still probably persist as suppression and containment of this plant is optimal. Any methods of control should be followed by revegetation to reduce regeneration of this plant and other weedy species.Figure 13. 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 State 6
Dense Saltcedar and/ or Russian Olive Stand/ AnnualsCommunity 6.1
Dense Saltcedar and/ or Russian Olive Stand/ AnnualsThis plant community evolved under frequent and severe grazing and encroachment of saltcedar and/or Russian olive. Saltcedar and/or Russian olive dominate this plant community. Most of the tall and medium grasses are eliminated and an understory of weedy herbaceous plants is prevalent. The interspaces between woody plants have expanded leaving the amount of bare ground more typical and more soil surface exposed to erosive elements or invaders.
The weedy plants, such as kochia, halogeton, Russian knapweed, and Russian thistle, make up the dominant understory. Total annual production is mostly from shrubs and these weedy plants. Saltcedar and/or Russian olive make up greater than 35% of the total annual production. When compared with the HCPC, the annual production is less due to the removal of the perennial grass and amount of bare ground. The increase in woody species, however, compensates for some of this loss.
The total annual production (air-dry weight) of this state is about 450 pounds per acre, but it can range from about 300 lbs./acre in unfavorable years to about 600 lbs./acre in above average years.
This plant community is resistant to change as the stand becomes denser. These areas may actually be more resistant to fire as less fine fuels are available and the bare ground between the shrubs is increased. Continued frequent and severe grazing or the removal of grazing does not seem to affect the plant composition or structure of the plant community. Saltcedar, Russian olive, annual grasses, weedy species and bare ground compromise the biotic integrity. Plant diversity is poor and the potential for native grasses to reproduce is absent. The shift in the vegetative structure and function is extreme and the biotic integrity is lost.
The soil of this state is not protected as erosion has 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. The watershed is not functional due to excessive runoff, erosion and bare ground.
Transitional pathways leading to other plant communities are as follows:
• Brush management and prescribed grazing will result in an Alkali Sacaton/Saltcedar and/or Russian Olive Plant Community. Controlling both Saltcedar and Russian olive is a priority if these species have invaded. Any methods of control should be followed by revegetation to reduce regeneration of these two species and other weedy plants.
• Grazing land mechanical treatment, brush management, and prescribed grazing may convert this plant community to the Historic Climax Plant Community, but recovery is mostly impractical as removal of salt cedar and/or Russian olive is both expensive and total removal is typically not obtainable. Salt cedar and Russian olive will still probably persist as suppression and containment of this plant is optimal. Any methods of control should be followed by revegetation to reduce regeneration of this plant and other weedy species.Figure 14. 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 Additional community tables
Table 5. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 90–180 saltgrass DISP Distichlis spicata 90–180 – 2 90–180 alkali sacaton SPAI Sporobolus airoides 90–180 – 3 90–180 basin wildrye LECI4 Leymus cinereus 90–180 – 4 45–135 western wheatgrass PASM Pascopyrum smithii 45–135 – 5 0–90 Grass, perennial 2GP Grass, perennial 0–45 – Indian ricegrass ACHY Achnatherum hymenoides 0–45 – blue grama BOGR2 Bouteloua gracilis 0–45 – Canada wildrye ELCA4 Elymus canadensis 0–45 – squirreltail ELELE Elymus elymoides ssp. elymoides 0–45 – Forb6 0–90 Forb, perennial 2FP Forb, perennial 0–45 – textile onion ALTE Allium textile 0–45 – povertyweed IVAX Iva axillaris 0–45 – spiny phlox PHHO Phlox hoodii 0–45 – Pursh seepweed SUCA2 Suaeda calceoliformis 0–45 – smooth woodyaster XYGL Xylorhiza glabriuscula 0–45 – Shrub/Vine7 45–90 greasewood SAVE4 Sarcobatus vermiculatus 45–90 – 8 9–45 Gardner's saltbush ATGA Atriplex gardneri 9–45 – 9 9–45 Shrub (>.5m) 2SHRUB Shrub (>.5m) 0–45 – basin big sagebrush ARTRT Artemisia tridentata ssp. tridentata 0–45 – yellow rabbitbrush CHVI8 Chrysothamnus viscidiflorus 0–45 – rubber rabbitbrush ERNA10 Ericameria nauseosa 0–45 – Table 6. Community 2.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 7. Community 3.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 8. Community 4.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 9. Community 5.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 10. Community 6.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Animal community
Animal Community – Wildlife Interpretations
Historic Climax Plant Community: The predominance of grasses in this plant community favors grazers and mixed-feeders, such as bison, deer, and antelope. Suitable thermal and escape cover for wildlife is available as quantities of woody plants are adequate. This plant community may provide brood rearing/foraging areas for upland game birds including sage grouse, especially when found adjacent to sagebrush dominated states. Other birds that would frequent this plant community include western meadowlarks, horned larks, and golden eagles as well as upland game birds. Many grassland obligate small mammals would occur here.
Inland Saltgrass/Rhizomatous wheatgrasses/greasewood: This plant community exhibits a high level of plant species diversity due to the accumulation of salts in the soil. It provides both thermal and escape cover for deer and antelope. Upland game birds including the sage grouse find both cover and brood rearing/foraging benefits especially when found adjacent to sagebrush dominated states. Other birds that would frequent this plant community include western meadowlarks, horned larks, and golden eagles as well as upland game birds. Many grassland obligate small mammals would occur here.
Mixed Shrub/Short Grass Sod: These communities provide some foraging and cover for deer, antelope, and other large ungulates. This plant community, especially if proximal to other woody cover, may be used by sage grouse and other game birds for foraging and cover.
Dense Shrub/Bare Ground: This plant community can provide important winter foraging and cover for mule deer and antelope during that time. This community provides excellent escape and thermal cover for large ungulates, as well as nesting habitat for sage grouse and other upland game birds.
Alkali Sacaton/Saltcedar and/or Russian Olive: This plant community may be useful for the same large grazers that would use the Historic Climax Plant Community. However, the plant community is less productive, and thus, less apt to meet the seasonal needs of these animals. The shrub cover does provide good thermal and escape cover for both large animals and upland birds. Russian olive may provide a good source of food for some upland game birds and large animals. Many grassland obligate small mammals would occur here.
Dense Saltcedar and/or Russian Olive Stand/Annuals: This plant community can provide important winter cover for mule deer and antelope during that time and some foraging value if Russian olive trees are present. The plant community composition comprises little diversity, and thus, less apt to meet the seasonal needs of large grazers. The dense shrub cover does provide good thermal and escape cover for both large animals and upland birds. Russian olive may provide a good source of food for some upland game birds and large animals. Many grassland obligate small mammals would occur here.
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.
Plant Community Production Carrying Capacity*
(lb./ac) (AUM/ac)
Historic Climax Plant Community 500-1200 .35
Inland Saltgrass/R. Wheatgrasses/Greasewood 450-1000 .30
Mixed Shrub/Short Grass Sod 350-800 .15
Dense Shrub/Bare Ground 300-600 .07
Alkali Sacaton/Saltcedar and/or Russian Olive 400-900 .25
Dense Saltcedar and/or Russian Olive Stand/Annuals 300-600 .07
* - Continuous, season-long grazing by cattle under average growing conditions.
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.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 moderate to rapid. Runoff potential for this site varies from moderate to high 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 with the exception of relics, which should now be stabilized. 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 may be present. 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 esthetic value that appeals to visitors
Wood products
No appreciable wood products are present on the site.
Other products
none noted
Supporting information
Inventory data references
Information presented here has been derived from NRCS inventory data. Field observations from range trained personnel were also used. Those involved in developing this site include: Chris Krassin, Range Management Specialist, NRCS and Everet Bainter, Range Management Specialist. 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 3, and USDA NRCS Soil Surveys from various counties.
Contributors
Ray Gullion
Approval
Scott Woodall, 10/04/2019
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) Ray Gullion, E. Bainter Contact for lead author ray.gullion@wy.usda.gov or 307-347-2456 Date 05/01/2008 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
-
Number and extent of rills:
Rare to nonexistent. Where present, short and widely spaced. -
Presence of water flow patterns:
Barely observable. -
Number and height of erosional pedestals or terracettes:
Slight pedestalling evident. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground can range from 20-40%. -
Number of gullies and erosion associated with gullies:
Active gullies typically present associated with ephemeral drainages associated with this site. -
Extent of wind scoured, blowouts and/or depositional areas:
Minimal to nonexistent. -
Amount of litter movement (describe size and distance expected to travel):
Herbaceous litter expected to move only in small amounts. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil Stability Index ratings range from 2 (interspaces) to 5 (under plant canopy), but average values should be 3.5 or greater. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Soil data is limited for this site. Described A-horizons vary from 1 to 4 inches (3-10 cm). Organic matter is typically 1 to 2%. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Plant community consists of 45-75% grasses, 10% forbs, and 15-45% shrubs. Evenly distributed plant canopy (40-80%) and litter, and slow to moderate infiltration rates result in slight to moderate runoff. Basal cover is typically less than 5% for this site and does very little to effect runoff 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 exists, but some soil crusting in dry conditions is typical. -
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, cool season bunchgrassesSub-dominant:
perennial shrubscool season rhizomatous grassesOther:
mid & short-size, cool season bunchgrasses=perennial forbsAdditional:
-
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Minimal decadence, typically associated with shrub component. -
Average percent litter cover (%) and depth ( in):
Litter ranges from 10-25% of total canopy measurement with total litter (including beneath the plant canopy) from 25-50% expected. Herbaceous litter depth typically ranges from 3-10mm. Woody litter can be up to a couple inches (4-6 cm). -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
English: 500-1200 lb/ac (850 lb/ac average); Metric: 560 -1344 kg/ha (952 kg/ha average). -
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:
Bare ground greater than 50% is the most common indicator of a threshold being crossed. Greasewood and inland saltgrass are common increasers. Perennial pepperweed, annual mustards, halogeton, kochia, and Russian thistle are common invasive species in disturbed sites. -
Perennial plant reproductive capability:
All species are capable of reproducing, except in drought years.
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