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Ecological site GX060B00X131

Shallow Clay 10-14

Last updated: 8/27/2024
Accessed: 12/05/2024

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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.

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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): 060B–Pierre Shale Plains, Northern Part

MLRA 060B, Pierre Shale Plains (Northern Part), is almost entirely in Montana (94 percent) and Wyoming (6 percent). The area makes up about 2,160,000 acres and occurs in the uplands between most of the major rivers in southeastern Montana and northeastern Wyoming. The area is within the Missouri Plateau, Unglaciated, Section of the Great Plains Province of the Interior Plains. It is an area of old plateaus and terraces that have been deeply eroded.

The shale plains have long, smooth, gentle to strong slopes. Slopes along drainageways and streams are moderately steep or steep. Elevation ranges from 1,900 to 3,500 feet on uplands. Marine and continental sediments of the Cretaceous Montana Group underlie most of this MLRA.

The average annual precipitation in the area is 14 inches and ranges from 11 to 17 inches. Most of the annual precipitation occurs as high-intensity, convective thunderstorms during the growing season. Precipitation in winter occurs mainly as snow, which usually is accompanied by high winds that cause much drifting.

The average annual temperature is 43 to 46 degrees Fahrenheit. The freeze-free period averages 142 days and ranges from 130 to 160 days. The frost-free period averages 120 days and ranges from 110 to 135 days.

The dominant soil orders in this MLRA are Alfisols, Entisols, and Vertisols. The soils in the area dominantly have a frigid soil temperature regime, an ustic soil moisture regime, and smectitic mineralogy. The soils are shallow to very deep, generally well drained, and clayey.

The area supports native prairie vegetation characterized by a diversity of cool-season and warm-season grasses, sedges, forbs, and shrubs. A majority of this area is in farms or ranches and comprised of rangeland used for livestock grazing. Some small areas of nearly level to moderately sloping soils are used for winter wheat or for livestock feed crops.

Classification relationships

NRCS Soil Geography Hierarchy
• Land Resource Region: Western Great Plains
• Major Land Resource Area (MLRA): 060B Pierre Shale Plains, Northern Part

National Hierarchical Framework of Ecological Units (Cleland et al., 1997; McNab et al., 2007)
• Domain: Dry
• Division: Temperate Steppe
• Province: Great Plains-Palouse Dry Steppe Province (331)
• Section: North Central Highlands (331K) and Missouri Plateau Section (331M)

National Vegetation Classification Standard (Federal Geographic Data Committee, 2008)
• Class: Xeromorphic Woodland, Scrub and Herb Vegetation Class (3)
• Subclass: Cool Semi-Desert Scrub and Grassland Subclass (3.B)
• Formation: Cool Semi-Desert Scrub and Grassland Formation (3.B.1)
• Division: Cool Semi-Desert Scrub and Grassland Division (3.B.1.Ne)
• Macrogroup: Artemisia tridentata - Artemisia tripartita ssp. tripartita - Purshia tridentata Steppe and Shrubland Macrogroup (3.B.1.Ne.3)
• Group: Artemisia tridentata ssp. wyomingensis - Artemisia tridentata ssp. tridentata Steppe & Shrubland Group (3.B.1.Ne.3.a)

EPA Ecoregions
• Level 1: Great Plains (9)
• Level 2: West-Central Semi-Arid Prairies (9.3)
• Level 3: Northwestern Great Plains (9.3.3)
• Level 4: Sagebrush Steppe (43e)

Ecological site concept

This ecological site occurs on plains, hills, and escarpments at elevations ranging from 1,900 to 3,500 feet. Slopes range from 0 to 70 percent. This site occurs on all aspects and aspect can be significant, particularly on steep and very steep slopes. Slight variations in plant community composition and production can result due to aspect. These soils are generally 10 to 20 inches deep to shale and plant root penetration is restricted at that depth. The soil surface textures are typically clay, clay loam, silty clay, and silty clay loam and are well drained.

Associated sites

GX060B00X001	Clayey 10-14 The Clayey ecological site occurs on slopes of 0 to 15 percent, has a soil depth of greater than 20 inches to bedrock, and has significantly higher total annual production. The Clayey ecological site is generally positioned below the Shallow Clay ecological site.
GX060B00X005	Clayey Steep 10-14 The Clayey Steep ecological site occurs on slopes of 15 to 45 percent, has a soil depth of greater than 20 inches to bedrock, and has higher total annual production. The Clayey Steep ecological site is positioned below the Shallow Clay ecological site.
GX060B00X576	Shallow 10-14 The Shallow ecological site occurs on similar slopes, has similar soils depths, and has similar total annual production. The Shallow ecological site has soils with less than 35 percent clay content. The Shallow and Shallow Clay ecological sites occur on similar landform positions.

GX060B00X001

Clayey 10-14

The Clayey ecological site occurs on slopes of 0 to 15 percent, has a soil depth of greater than 20 inches to bedrock, and has significantly higher total annual production. The Clayey ecological site is generally positioned below the Shallow Clay ecological site.

GX060B00X005

Clayey Steep 10-14

The Clayey Steep ecological site occurs on slopes of 15 to 45 percent, has a soil depth of greater than 20 inches to bedrock, and has higher total annual production. The Clayey Steep ecological site is positioned below the Shallow Clay ecological site.

GX060B00X576

Shallow 10-14

The Shallow ecological site occurs on similar slopes, has similar soils depths, and has similar total annual production. The Shallow ecological site has soils with less than 35 percent clay content. The Shallow and Shallow Clay ecological sites occur on similar landform positions.

Similar sites

GX060B00X001	Clayey 10-14 The Clayey ecological site occurs on slopes of 0 to 15 percent, has a soil depth of greater than 20 inches to bedrock, and has significantly higher total annual production. The Clayey ecological site is generally positioned below the Shallow Clay ecological site.
GX060B00X005	Clayey Steep 10-14 The Clayey Steep ecological site occurs on slopes of 15 to 45 percent, has a soil depth of greater than 20 inches to bedrock, and has higher total annual production. The Clayey Steep ecological site is positioned below the Shallow Clay ecological site.
GX060B00X576	Shallow 10-14 The Shallow ecological site occurs on similar slopes, has similar soils depths, and has similar total annual production. The Shallow ecological site has soils with less than 35 percent clay content. The Shallow and Shallow Clay ecological sites occur on similar landform positions.

GX060B00X001

Clayey 10-14

GX060B00X005

Clayey Steep 10-14

GX060B00X576

Shallow 10-14

Table 1. Dominant plant species

Tree	Not specified
Shrub	(1) Krascheninnikovia lanata (2) Atriplex nuttallii
Herbaceous	(1) Pascopyrum smithii (2) Nassella viridula

Legacy ID

R060BE577MT

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Physiographic features

Table 2. Representative physiographic features

Landforms	(1) Plain (2) Hill (3) Escarpment
Runoff class	Medium to high
Flooding frequency	None
Ponding frequency	None
Elevation	579 – 1,067 m
Slope	0 – 70%
Water table depth	152 – 183 cm
Aspect	W, NW, N, NE, E, SE, S, SW

Climatic features

MLRA 060B is a semi-arid region and is considered to have a continental climate characterized by cold winters, hot summers, low humidity, light rainfall, and much sunshine. The climate is the result of the MLRA’s location in the geographic center of North America. Temperatures can be extreme.

The average annual temperature is 43 to 46 degrees Fahrenheit. Summer daytime temperatures are typically quite warm, generally averaging in the lower to mid-80’s for July and August. Summertime temperatures will typically reach 100 degrees or more at some point during the summer and can reach 90 degrees during any month between May and September. Conversely, winter temperatures can be cold, averaging in the mid-teens to mid-20’s for December and January. There will typically be several days of below zero temperatures each winter. It is not uncommon for temperatures to reach 30 to 40 degrees below zero, or even colder, most any winter.

The average annual precipitation in this area is 14 inches, and ranges from 11 to 17 inches. During an average year, 70 to 75 percent of the annual precipitation falls between April and September, which are the primary growing season months. A majority of the annual precipitation occurs as frontal storms early in the growing season during the months of May and June and high-intensity, convective thunderstorms during July and August. Some rainfall occurs during the fall.

Seasonal precipitation is often limiting for plant growth. Annual fluctuations in species composition and total production are typical depending on the amount and timing of rainfall. Precipitation during the winter occurs primarily as snow, although snowfall is generally not heavy. Snow cover is typically 1 to 3 inches. Heavy snowfall occurs infrequently, usually late in the winter or early spring. Snowfall is generally accompanied by high winds that causes drifting.

The prevailing wind direction is from the northwest. Precipitation fluctuates widely from year to year and severe drought occurs 2 out of 10 years on average. There are few natural barriers on the northern Great Plains and the winds move freely across the plains and account for rapid changes in temperature. Spring can be windy throughout the MLRA, with winds averaging over 10 mph about 15 percent of the time. Speeds of 50 mph or stronger can occasionally occur.

For local climate station information, refer to https://wrcc.dri.edu/summary/Climsmemt.html.

Table 3. Representative climatic features

Frost-free period (characteristic range)	110-135 days
Freeze-free period (characteristic range)	130-160 days
Precipitation total (characteristic range)	254-356 mm
Frost-free period (actual range)
Freeze-free period (actual range)
Precipitation total (actual range)	254-432 mm
Frost-free period (average)	120 days
Freeze-free period (average)	142 days
Precipitation total (average)	356 mm

Characteristic range

Actual range

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Figure 2. Monthly precipitation range

Characteristic range

Actual range

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Figure 3. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 4. Monthly maximum temperature range

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Figure 5. Monthly average minimum and maximum temperature

Figure 6. Annual precipitation pattern

Figure 7. Annual average temperature pattern

Climate stations used

(1) INGOMAR 14 NE [USC00244386], Ingomar, MT
(2) RIDGEWAY 1 S [USC00247034], Hammond, MT
(3) ALBION 1 N [USC00240088], Alzada, MT
(4) BAKER MUNI AP [USW00094055], Baker, MT

Influencing water features

This upland ecological site is not influenced by a water table or run in from adjacent sites. Due to the semi-arid climate in which it occurs, the water budget is normally contained within the soil pedon. Soil moisture is recharged by spring rains, but it rarely exceeds field capacity in the upper 40 inches before being depleted by evapotranspiration. During intense precipitation events, precipitation rates frequently exceed infiltration rates and the site delivers moisture to downslope sites through surface runoff. Moisture loss through evapotranspiration exceeds precipitation for a majority of the growing season. Soil moisture is the primary limiting factor for vegetative production on this ecological site.

Wetland description

Not Applicable

Soil features

Soils associated with this ecological site are typically shallow (10 to 20 inches) to paralithic bedrock, well drained, and derived from shale residuum. Surface horizon textures range from clay loam to clay and contain greater than 32 percent clay. The underlying horizons typically contain 35 percent clay or more and have clay loam, silty clay loam, silty clay, sandy clay, or clay textures.

Table 4. Representative soil features

Parent material	(1) Alluvium – shale (2) Colluvium – shale (3) Residuum – shale
Surface texture	(1) Clay loam (2) Silty clay loam (3) Silty clay (4) Sandy clay (5) Clay
Drainage class	Well drained to somewhat excessively drained
Permeability class	Very slow to slow
Depth to restrictive layer	25 – 51 cm
Soil depth	25 – 51 cm
Surface fragment cover <=3"	0 – 15%
Surface fragment cover >3"	0 – 5%
Available water capacity (0-50.8cm)	5.08 – 10.16 cm
Electrical conductivity (0-50.8cm)	0 – 4 mmhos/cm
Sodium adsorption ratio (0-50.8cm)	0 – 4
Subsurface fragment volume <=3" (0-50.8cm)	0 – 5%
Subsurface fragment volume >3" (0-50.8cm)	0 – 5%

Ecological dynamics

The Reference state is the plant community in which interpretations are primarily based and is used as a reference in order to understand the original potential of the site. The Reference state evolved under the combined influences of climatic conditions, periodic fire activity, grazing by large herbivores, and impacts from small mammals and insects. Changes may occur to the Reference state due to management actions such as improper grazing management, climatic conditions such as drought, and natural events such as multiple fires in close succession. The Reference state for this ecological site is dominated by a diversity of tall and medium height, cool-season and warm-season grasses which are tightly intermixed and well distributed over the site. Various forbs, half-shrubs, and shrubs are common on this site. The Reference state is not necessarily the management goal, as other vegetative states may be considered desired plant communities as long as critical resource concerns are met.

In addition to the Reference state, other plant communities can occur on this site and are usually the result of historic management practices. Long term overgrazing on this ecological site results in a decrease of tallgrasses, mid-grasses, and more palatable forbs and in an increase of shortgrasses, sedges, and less palatable forbs. Half-shrubs and shrubs increase in the absence of prescribed fire and wildfire. More frequent fire intervals decreases the shrub component resulting in a site dominated by herbaceous species. There are various transitional stages which may occur on this ecological site.

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

1. Reference

2. Shortgrass

3. Invaded

T1A	-	Prolonged drought, improper grazing, or a combination of these factors
T1B	-	Introduction of non-native invasive species (annual bromes, crested wheatgrass, noxious weeds)
R2A	-	Proper grazing management in combination with rangeland seeding, grazing land mechanical treatment, and timely moisture (management intensive and costly)
T2A	-	Introduction of non-native invasive species (annual bromes, crested wheatgrass, noxious weeds)

State 1 submodel, plant communities

1.1. Winterfat, Nuttall's Saltbush, Western Wheatgrass, and Green Needlegrass

1.2. Western Wheatgrass and Green Needlegrass

1.3. Nuttall's Saltbush and Blue Grama

1.4. Western Wheatgrass and Blue Grama

1.1A	-	Prescribed fire and wildfire, mechanical and chemical treatments, biological processes
1.1B	-	Drought, improper grazing management
1.2A	-	Approximately 30 years post-fire regrowth
1.2B	-	Drought, improper grazing management, multiple fires in close succession
1.3B	-	Normal or above average precipitation, proper grazing management
1.3A	-	Prescribed fire and wildfire, mechanical and chemical treatments, biological processes
1.4B	-	Normal or above average precipitation, proper grazing management
1.4A	-	Approximately 30 years post-fire regrowth

State 2 submodel, plant communities

2.1. Wyoming Big Sagebrush, Blue Grama, and Prairie Junegrass

2.2. Blue Grama and Threadleaf Sedge

2.1A	-	Prescribed fire and wildfire, mechanical and chemical treatments, biological processes
2.2A	-	Approximately 30 years post-fire regrowth

State 3 submodel, plant communities

3.1. Cheatgrass and Field Brome

State 1
Reference

The Reference state evolved under the combined influences of climatic conditions, periodic fire activity, grazing by large herbivores, and impacts from small mammals and insects. The Reference state is the plant community in which interpretations are primarily based and is used as a reference in order to understand the original potential of the site. The Reference state for this ecological site consists of four communities.

Community 1.1
Winterfat, Nuttall's Saltbush, Western Wheatgrass, and Green Needlegrass

This plant community is characterized by a mixed-grass community and shrub species. The predominant species are cool-season grasses such as western wheatgrass, green needlegrass, and bluebunch wheatgrass with warm-season species such as little bluestem, sideoats grama, and plains muhly. Shortgrasses and sedges such as prairie Junegrass, Sandberg bluegrass, blue grama, buffalograss, and needleleaf sedge are present at low cover. Forbs such as American vetch, prairie coneflower, black samson, spiny phlox, purple prairie clover, white prairie clover, prairie thermopsis, buckwheat, and scurfpea occur at approximately 5 percent canopy cover or less. Wyoming big sagebrush occurs at approximately 5 to 15 percent canopy cover and half-shrubs such as winterfat and Nuttall's saltbush are common.

Community 1.2
Western Wheatgrass and Green Needlegrass

This plant community is characterized by wheatgrass and bunchgrass communities including species such as western wheatgrass, green needlegrass, bluebunch wheatgrass, little bluestem, and plains muhly. Shortgrasses and sedges such as prairie Junegrass, Sandberg bluegrass, blue grama, buffalograss, and needleleaf sedge are present at low cover. Forbs such as American vetch, prairie coneflower, black samson, spiny phlox, purple prairie clover, white prairie clover, prairie thermopsis, buckwheat, and scurfpea occur at approximately 5 percent canopy cover or less. Shrubs and half-shrubs are absent to rare. This plant community occurs when the plant community is burned by either wildfire or prescribed fire and may persist as long as 30 years following the burn (Watts, M.J., and C.L. Wambolt. 1996).

Community 1.3
Nuttall's Saltbush and Blue Grama

This plant community is characterized by an increase in shortgrass species such as prairie Junegrass, Sandberg bluegrass, blue grama, and buffalograss and rhizomatous wheatgrasses such as western wheatgrass. Mid-statured bunchgrasses such as green needlegrass, bluebunch wheatgrass, little bluestem, and plains muhly are rare or absent. Unpalatable forbs such as American vetch, prairie coneflower, black samson, spiny phlox, purple prairie clover, white prairie clover, prairie thermopsis, buckwheat, and scurfpea and unpalatable half-shrubs such as prairie sagewort are increasing. Wyoming big sagebrush occurs at 5 to 20 percent canopy cover.

Community 1.4
Western Wheatgrass and Blue Grama

This plant community is characterized by a dominance of shortgrass species such as prairie Junegrass, Sandberg bluegrass, blue grama, and buffalograss and rhizomatous wheatgrasses such as western wheatgrass. Mid-statured bunchgrasses such as green needlegrass, bluebunch wheatgrass, little bluestem, and plains muhly are rare or absent. Unpalatable forbs such as American vetch, prairie coneflower, black samson, spiny phlox, purple prairie clover, white prairie clover, prairie thermopsis, buckwheat, and scurfpea and unpalatable half-shrubs such as prairie sagewort are increasing. Wyoming big sagebrush is rare. This plant community occurs when site conditions decline due to long-term drought or improper grazing management, and a fire has occurred on the site less than 30 years prior.

Pathway 1.1A
Community 1.1 to 1.2

Prescribed fire and wildfire, mechanical and chemical treatments, and biological processes will transition community 1.1 to community 1.2. Wyoming big sagebrush is greatly reduced and perennial grasses will dominate the site.

Pathway 1.1B
Community 1.1 to 1.3

Drought, improper grazing management such as continuous season-long or year-long grazing, or a combination of these factors can shift community 1.1 to community 1.3. These factors favor an increase in shortgrass species such as blue grama and a decrease in cool-season mid-statured grasses. Wyoming big sagebrush cover will be similar to community 1.1.

Pathway 1.2A
Community 1.2 to 1.1

Approximately 30 years or more of natural vegetative regrowth will transition community 1.2 to community 1.1. Approximately 30 years or more without fire permits Wyoming big sagebrush to recolonize the site.

Pathway 1.2B
Community 1.2 to 1.4

Drought, improper grazing management such as continuous season-long or year-long grazing, multiple fires in close succession, or a combination of these factors can shift community 1.2 to community 1.3. These factors favor an increase in shortgrass species such as blue grama and a decrease in cool-season mid-statured grasses. Wyoming big sagebrush cover will be similar to community 1.2.

Pathway 1.3B
Community 1.3 to 1.1

Approximately 30 years or more post-fire, normal or above average precipitation, and proper grazing management transitions community 1.3 to community 1.1. This transition may also occur through natural succession.

Pathway 1.3A
Community 1.3 to 1.4

Prescribed fire and wildfire, mechanical and chemical treatments, and biological processes will transition community 1.3 to community 1.4. Wyoming big sagebrush is greatly reduced and perennial grasses will dominate the site.

Pathway 1.4B
Community 1.4 to 1.2

Less than approximately 30 years post-fire, normal or above average precipitation, and proper grazing management transitions community 1.4 to community 1.2.

Pathway 1.4A
Community 1.4 to 1.3

Approximately 30 years or more of natural shrub regrowth will transition community 1.4 to community 1.3. Approximately 30 years or more without fire permits Wyoming big sagebrush to recolonize the site.

State 2
Shortgrass

The dynamics of the Shortgrass state are driven by long-term drought, improper grazing management such as continuous season-long or year-long grazing, or a combination of these factors. The Shortgrass state for this ecological site consists of two communities.

Community 2.1
Wyoming Big Sagebrush, Blue Grama, and Prairie Junegrass

This plant community is characterized by a dominance of shortgrasses such as prairie Junegrass, Sandberg bluegrass, blue grama, and buffalograss. Mid-statured grasses such as western wheatgrass, green needlegrass, bluebunch wheatgrass, little bluestem, and plains muhly are rare or absent. Unpalatable forbs such as American vetch, prairie coneflower, black samson, spiny phlox, purple prairie clover, white prairie clover, prairie thermopsis, buckwheat, and scurfpea and unpalatable half-shrubs such as prairie sagewort are common. Wyoming big sagebrush canopy cover is 5 to 15 percent. This community phase results in a reduction of soil surface litter, soil organic matter, and infiltration and an increase of soil surface runoff. This plant community is capable of tolerating season-long, heavy grazing and therefore is highly resistant to change.

Community 2.2
Blue Grama and Threadleaf Sedge

This plant community is characterized by a dominance of short-statured grasses such as prairie Junegrass, Sandberg bluegrass, blue grama, and buffalograss and sedges such as threadleaf sedge. Mid-statured grasses such as western wheatgrass, green needlegrass, bluebunch wheatgrass, little bluestem, and plains muhly are rare or absent. Unpalatable forbs such as American vetch, prairie coneflower, black samson, spiny phlox, purple prairie clover, white prairie clover, prairie thermopsis, buckwheat, and scurfpea and unpalatable half-shrubs such as prairie sagewort are common. Wyoming big sagebrush is rare. This plant community occurs when site conditions decline due to long-term drought or improper grazing management, and a fire has occurred on the site less than 30 years prior. This community results in a reduction of soil surface litter, soil organic matter, and infiltration and an increase of soil surface runoff. This plant community is capable of tolerating season-long, heavy grazing and therefore is highly resistant to change.

Pathway 2.1A
Community 2.1 to 2.2

Prescribed fire and wildfire, mechanical and chemical treatments, and biological processes will transition community 2.1 to community 2.2. Wyoming big sagebrush is greatly reduced and perennial grasses will dominate the site.

Pathway 2.2A
Community 2.2 to 2.1

It is believed that approximately 30 years or more of natural vegetative regrowth could transition community 2.2 to community 2.1. It is possible that this transition could occur over time, however, the processes are not fully understood at this time. Therefore, this pathway is considered hypothetical until further investigation can be completed.

State 3
Invaded

The Invaded state occurs when invasive plant species invade native grassland communities and displace the native species. The Invaded state consists of one community.

Community 3.1
Cheatgrass and Field Brome

Observations suggest that native species diversity declines significantly when invasive or noxious species exceed approximately 30 percent of the plant community. Non-native, perennial, drought tolerant grasses such as crested wheatgrass, non-native, annual, invasive species such as cheatgrass and field brome, and noxious weed species can eventually dominate the seedbank of this site and displace native species. Reduced plant species diversity, simplified structural complexity, and altered ecological processes result in a state that is substantially departed from the Reference state. The dominance of annual, invasive grasses such as cheatgrass and field brome increases the fire cycle frequency.

Transition T1A
State 1 to 2

Prolonged drought, improper grazing management such as continuous season-long or year-long grazing, or a combination of these factors weaken the resilience of the Reference state and drive its transition to the Shortgrass state. The Reference state transitions to the Shortgrass state when mid-statured graminoids are greatly reduced and shortgrasses such as blue grama, Sandberg bluegrass, prairie Junegrass, and buffalograss dominate the plant community.

Transition T1B
State 1 to 3

The Reference state transitions to the Invaded state when non-native grasses or noxious weeds invade the plant community. Exotic plant species dominate the site in terms of cover and production and site resilience has been substantially reduced. In addition, other rangeland health attributes, such as reproductive capacity of native grasses and soil quality, have been substantially altered from the Reference state.

Restoration pathway R2A
State 2 to 1

Blue grama can resist displacement by other species. A reduction in livestock grazing pressure alone may not be sufficient to reduce the cover of blue grama in the Shortgrass state and mechanical treatments may be necessary. Therefore, returning the Shortgrass state to the Reference state can require considerable cost, energy, and time.

Conservation practices

Prescribed Grazing

Transition T2A
State 2 to 3

The Shortgrass state transitions to the Invaded state when non-native grasses, noxious weeds, and other invasive plants invade the Shortgrass state. Exotic plant species dominate the site in terms of cover and production. Site resilience has been substantially reduced.

Additional community tables

Supporting information

Inventory data references

Specific field data was not obtained for this provisional ecological site description. Existing field data was used in conjunction with a review of scientific literature and professional experience to approximate the plant communities, states, and transitions. All community phases are considered provisional based on the sources identified in this ecological site description.

Other references

Cleland, D.T., et al. 1997. National Hierarchical Framework of Ecological Units. In: M.S. Boyce and A. Haney (eds.) Ecosystem Management Applications for Sustainable Forest and Wildlife Resources, Yale University Press, New Haven, CT.

Dormaar, J.F., and S. Smoliak. 1985. Recovery of vegetative cover and soil organic matter during revegetation of abandoned farmland in a semiarid climate. Journal of Range Management 38:487-491.

Federal Geographic Data Committee. 2008. The National Vegetation Classification Standard, Version 2. FGDC Vegetation Subcommittee. FGDC-STD-005-2008 (Version 2). pp. 126.

Fire Effects Information System. USDA Forest Service. http://www.fs.fed.us/database/feis/plants/shrub/amealn/all.html.

Interagency Ecological Site Handbook for Rangelands. USDA Natural Resources Conservation Service, USDA Forest Service, USDI Bureau of Land Management. January 2013.

Land Resource Regions and Major Land Resource Areas of the United States, the
Caribbean, and the Pacific Basin. USDA Handbook 296. USDA Natural Resources Conservation Service. 2006.

McNab, W.H., et al. 2007. Description of Ecological Sub-Regions: Sections of the Conterminous United States. USDA Forest Service. General Technical Report WO-76B.

National Cooperative Soil Survey. USDA Natural Resources Conservation Service.
https://www.nrcs.usda.gov/wps/portal/nrcs/main/soils/survey/partnership/ncss/.

National Ecological Site Handbook. USDA Natural Resources Conservation Service. March 2017.

National Range and Pasture Handbook. USDA Natural Resources Conservation Service. December 2003.

National Soil Information System. USDA Natural Resources Conservation Service.
https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/geo/?cid=nrcs142p2_053552.

National Soil Survey Handbook. USDA Natural Resources Conservation Service. November 2019.

National Water and Climate Center. USDA Natural Resources Conservation Service.
https://www.wcc.nrcs.usda.gov/.

NRCS Plants Database. USDA Natural Resources Conservation Service.
https://plants.usda.gov/java/.

Samuel, M.J., and R.H. Hart. 1994. Sixty-one years of secondary succession on rangelands of the Wyoming High Plains. Journal of Range Management 47:184-191.

Soil Survey Manual. USDA Natural Resources Conservation Service. March 2017.

Watts, M.J., and C.L. Wambolt. 1996. Long-term recovery of Wyoming big sagebrush after four treatments. Journal of Environmental Management 46:95-102.

Web Soil Survey. USDA Natural Resources Conservation Service.
https://websoilsurvey.nrcs.usda.gov/app/HomePage.htm.

Contributors

Maryjo Kimble
Jeff Fenton
Scott Brady

Approval

Kirt Walstad, 8/27/2024

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)
Contact for lead author
Date	08/16/2024
Approved by	Kirt Walstad
Approval date
Composition (Indicators 10 and 12) based on	Annual Production