Natural Resources
Conservation Service
Ecological site R067AY174WY
Subirrigated (Sb)
Last updated: 11/29/2024
Accessed: 09/01/2026
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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): 067A–Central High Plains, Northern Part
MLRA 67A-Central High Plains, Northern Part is located in southeastern Wyoming (58 percent), the southwestern portion of the Nebraska panhandle (38 percent), and extreme northeastern Colorado (4 percent). It is comprised of rolling plains, upland breaks, and river valleys. The major rivers are the North Platte and Laramie. The headwaters of these systems are in the Rocky Mountains. Other tributaries include Crow, Horse, and Lodgepole Creeks. This MLRA is traversed by Interstate 25 and Interstate 80, and by U.S. Highways 26, 30 and 85. Major land uses include rangeland (71 percent), cropland (21 percent), pasture and hayland (1 percent), urban (3 percent), and miscellaneous (4 percent). Cities in this area include Cheyenne, Torrington, and Wheatland, WY; and Kimball, Oshkosh, and Scottsbluff, NE. Land ownership is mostly private. Areas of interest include Scotts Bluff National Monument, Chimney Rock and Fort Laramie National Historic Sites; Hawk Springs, Lake Minatare, and Wildcat Hills State Recreation Areas; Ash Hollow and Guernsey State Parks.
The elevations in MLRA 67A range from approximately 3,300 to 6,200 feet. The average annual precipitation in this area ranges from 13 to17 inches per year, but may increase up to 18 inches per year, in localized areas. Precipitation occurs mostly during the growing season from rapidly developing thunderstorms. Mean annual air temperature ranges from 47 degrees Fahrenheit in the western part to 52 degrees Fahrenheit in the eastern part. Summer temperatures may exceed 100 degrees Fahrenheit. Winter temperatures may drop to sub-zero, and snowfall varies from 20 to 50 inches per year.Classification relationships
MLRA 67A is in the Western Great Plains Range and Irrigation Land Resource Region. It is in the High Plains Section, of the Great Plains Province, of the Interior Plains (USDA, 2006). MLRAs can be defined by climate, landscapes, geology, and annual precipitation zones (PZ). Other features such as landforms, soil properties, and key vegetation further refine these concepts, and are described at the Ecological Site Description (ESD) level.
Revision Notes
The Subirrigated (SS) 12-17 inch PZ Ecological Site was developed by an earlier version of the Subirrigated (SS) ESD (2005, updated 2008). The earlier version of the Subirrigated (SS) 12-17 inch Precipitation Zone ESD was based on input from NRCS (formerly Soil Conservation Service) and historical information obtained from the Subirrigated (SS) Range Site Description (1988) and earlier (1970). This ESD meets the Provisional requirements of the National Ecological Site Handbook (NESH). This ESD will continue refinement towards an Approved status according to the NESH.Ecological site concept
The Subirrigated site is a run-on site that is not saline or alkaline and has a water table that ranges from 6 to 36 inches during part of the growing season.
Associated sites
R067AY124WY Loamy Lowland (LyL)
This ecological site is commonly adjacent.
R067AY152WY Sandy Lowland (SyL)
This ecological site is commonly adjacent.
R067AY178WY Wetland (WL)
This ecological site is commonly adjacent.
Similar sites
R067AY142WY Saline Subirrigated (SS)
The Saline Subirrigated Ecological Site is saline or alkaline.
Table 1. Dominant plant species
Tree Not specified
Shrub (1) Salix
Herbaceous (1) Andropogon gerardii
(2) Schizachyrium scopariumPhysiographic features
This site typically occurs on the floodplains, flood-plain steps, or drainageways of the river valleys; but may also occur in seeps, swales, or interdunes.
Table 2. Representative physiographic features
Landforms (1) Flood plain
(2) Flood-plain step
(3) Drainageway
Runoff class Negligible to low Flooding duration Brief (2 to 7 days) to long (7 to 30 days) Flooding frequency Occasional to frequent Ponding frequency None Elevation 3500 – 6500 ft Slope 0 – 3 % Water table depth 6 – 36 in Aspect Aspect is not a significant factor Climatic features
Wide fluctuations in precipitation may occur from year to year, as well as occasional periods of drought (longer than one year in duration). Two-thirds of the annual precipitation occurs during the growing season from April to September. The mean annual air temperature (MAAT) ranges from 47 degrees Fahrenheit in the western part to 52 degrees Fahrenheit in the eastern part. Cold air outbreaks from Canada in winter move rapidly from northwest to southeast and account for extreme minimum temperatures. Chinook winds may also occur in winter and bring rapid rises in temperature. Extreme storms may occur during the winter, but most severely affect ranch operations during the late winter and spring months. High-intensity afternoon thunderstorms may arise in summer. Wind speed averages about 8 miles per hour, ranging from 10 during the spring to 7 during late summer. Daytime winds are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 75 mph. The average length of the freeze-free period (28 degrees Fahrenheit) is 150 days from May 4 to October 1. The average frost-free period (32 degrees Fahrenheit) is 128 days from May 16 to September 21. Growing season increases from west to east (Wyoming to Nebraska). Growth of native cool-season plants begins about April 1 and continues to mid-June. Native warm-season plants begin growth about May 15 and continue to about August 15. Regrowth of cool-season plants occur in September in most years, depending upon moisture.
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) 20-20 in Frost-free period (actual range) 80-120 days Freeze-free period (actual range) 120-140 days Precipitation total (actual range) 10-20 in Frost-free period (average) 100 days Freeze-free period (average) 130 days Precipitation total (average) 20 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) BRIDGEPORT [USC00251145], Bridgeport, NE
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(2) HARRISBURG 12WNW [USC00253605], Harrisburg, NE
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(3) KIMBALL 2NE [USC00254440], Kimball, NE
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(4) OSHKOSH [USC00256385], Oshkosh, NE
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(5) CHUGWATER [USC00481730], Chugwater, WY
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(6) PHILLIPS [USC00487200], LaGrange, WY
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(7) WHEATLAND 4 N [USC00489615], Wheatland, WY
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(8) CHEYENNE [USW00024018], Cheyenne, WY
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(9) SCOTTSBLUFF HEILIG AP [USW00024028], Scottsbluff, NE
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(10) OLD FT LARAMIE [USC00486852], Yoder, WY
">Influencing water features
The Subirrigated site has a seasonal water table that influences the kinds and amounts of vegetation on this site. The water table in some areas is anthropogenic, caused by seepage from nearby irrigation ditches, canals, and reservoirs. Some soils in this ESD are hydric soils; most map units in this ESD have a minor (1 to 10 percent) hydric component associated with them. Some map units have a major (35 to 60 percent) hydric component associated with them.
Wetland description
Wetland Description (Cowardin System) <br />
System Subsystem Class <br />
Palustrine N/A Emergent WetlandSoil features
The soils on the Subirrigated site are typically very deep, poorly to somewhat poorly drained soils, that formed from alluvium. They typically have a moderate to moderately rapid permeability class. The available water capacity is very low to moderate. Available water is the portion of water in a soil that can be readily absorbed by plant roots. This is the amount of water released between the field capacity and the permanent wilting point. The soil moisture regime is typically aquic. The soil temperature regime is mesic.
The surface layer of the soils in this site are typically loam or fine sandy loam but may include very fine sandy loam or silt loam. The surface layer ranges from a depth of 4 to 10 inches thick. The subsoil is typically loam, fine sandy loam, very fine sandy loam, or fine sand, but may include strata of sand, sandy loam, or coarse sand. The subsoil typically contains 0 to 5 percent rock fragments, but some soils may have up to 30 percent. Soils in this site have carbonates at the surface but may be leached to 10 inches in a few soils. These soils are typically not susceptible to erosion by water and wind due to the wetness of the soil profile by the seasonal water table. However, these areas may have the hazard of wind erosion if these areas are drained and the surface is not protected by vegetation.
Surface soil structure is typically granular, and structure below the surface ranges from subangular blocky to massive and single grain. Soil structure describes the manner in which soil particles are aggregated and defines the nature of the system of pores and channels in a soil.
Major soil series correlated to this ecological site include: Fluvaquents, Gering, Gothenburg, Las Animas, McGrew, Merden (cool), Platte, Torrifluvents, Whetsoon, and Yockey.
Other soil series that have been correlated to this site include: Anvil, Bayard (variant), Bayard (wet), Clarkelen (wet), Els, Featherlegs (wet), Forkwood (wet), Ipage, Mainter (wet), Mitchell (variant), Otero (variant), Seep, and Sweatbee (wet).
The attributes listed below represent 0-40 inches in depth or to the first restrictive layer.
Note: Revisions to soil surveys are ongoing. For the most recent updates, visit the Web Soil Survey, the official site for soils information: http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx.
Figure 8. Soils Profile Image.—Yockey silt loam, Scotts Bluff County, NE
Table 4. Representative soil features
Parent material (1) Alluvium
Surface texture (1) Loam
(2) Fine sandy loam
Drainage class Poorly drained to somewhat poorly drained Permeability class Moderate to moderately rapid Soil depth 80 in Surface fragment cover <=3" Not specified Surface fragment cover >3" Not specified Available water capacity
(0-40in)2.4 – 7.2 in Calcium carbonate equivalent
(0-40in)0 – 15 % Electrical conductivity
(0-40in)0 – 4 mmhos/cm Sodium adsorption ratio
(0-40in)0 – 10 Soil reaction (1:1 water)
(0-40in)6.6 – 8.4 Subsurface fragment volume <=3"
(Depth not specified)0 – 30 % Subsurface fragment volume >3"
(Depth not specified)Not specified Ecological dynamics
The information in this ESD, including the State-and-Transition Model (STM) diagram, was developed using archeological and historical data, professional experience, and scientific studies. The information is representative of a dynamic set of plant communities that represent the complex interaction of several ecological processes. The plant composition has been determined by study of rangeland relic areas, areas protected from excessive disturbance, seasonal use pastures, short duration and time-controlled grazing strategies, and historical accounts.
The Subirrigated ecological site is characterized by three states: The Reference, Sod-bound, and Increased Bare Ground. The Reference State is characterized by warm-season rhizomatous tall and mid-grasses (big bluestem and prairie cordgrass), and warm-season bunch mid-grasses (little bluestem and switchgrass). Secondary grasses include warm-season bunch tallgrass (Indiangrass), cool-season bunch mid-grass (slender wheatgrass), and rhizomatous midgrass (western wheatgrass). A minor component of grass-likes such as rush, spikerush, and bulrush species; forbs and shrubs are also present. See the species composition list in this ESD. The Sod-bound State is characterized by Kentucky bluegrass, an invasive introduced species. The Increased Bare Ground State is characterized by remnant Kentucky bluegrass, increased foxtail barley, invasive annuals such as burningbush, and noxious weeds such as Dalmatian toadflax and leafy spurge.
As this site deteriorates from a combination of frequent and severe grazing, species such as mountain rush (also known as Baltic rush), scouring rush, and other grass-likes increase to form a cool-season dominated plant community. Kentucky bluegrass invades and eventually becomes sod-bound. Grasses such as big bluestem, little bluestem, prairie cordgrass, Indiangrass, and switchgrass decrease in frequency and production, and can eventually be removed from the site. As the site continues to deteriorate, bare ground may increase depending on water table depth. Kentucky bluegrass persists in a broken sod appearance. Noxious weeds also invade. Once these events have occurred, it is difficult for native perennial plants to reestablish. Trees such as Russian olive may also invade if a seed source is available.
The degree of grazing has a significant impact on the ecological dynamics of the site. This region was historically occupied by large grazing animals, such as bison, elk, pronghorn, and mule deer. Grazing by these large herbivores, along with climatic and seasonal weather fluctuations, had a major influence on the ecological dynamics of the site. Deer and pronghorn are widely distributed throughout the MLRA. Secondary influences of herbivory by species such as prairie dogs and other small rodents, insects, and root-feeding organisms continues to impact the vegetation.
Historically, grazing patterns by herds of large ungulates were driven by water distribution, precipitation events, drought events, and fire. It is believed that grazing periods would have been shorter, followed by longer recovery periods. These large migrating herds impacted the ecological processes of nutrient and hydrologic cycles, by urination, trampling (incorporation of litter into the soil surface), and breaking of surface crust, (which increases water infiltration).
Today, livestock grazing, especially beef cattle has been a major influence on the ecological dynamics of the site. Grazing management, coupled with the effects of annual climatic variations, largely dictates the plant communities for the site.
Recurrent drought has historically impacted the vegetation of this region. Changes in species composition vary depending upon the duration and severity of the drought cycle and prior grazing management. Drought events since 2002 have significantly increased mortality of blue grama and buffalograss in some locales.
This site developed with occasional fire as part of the ecological processes. Historic fire frequency (pre-industrial) is estimated at 10 to14 years (Guyette, 2012), randomly distributed, and started by lightning at various times throughout the growing season. Early human inhabitants also were likely to start fires for various reasons (deliberate or accidental). It is believed that fires were set as a management tool for attracting herds of large migratory herbivores (Stewart, 2002). The impact of fire over the past 100 years has been relatively insignificant due to the human control of wildfires and the lack of acceptance of prescribed fire as a management tool.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 textEcosystem states
T1A - Excessive grazing. Lack of fire. T2A - Excessive grazing. Lack of fire. State 1 submodel, plant communities
1.1A - Excessive grazing. Lack of fire. 1.1B - Non-use. Lack of fire. 1.2A - Prescribed grazing. Prescribed fire. 1.3A - Prescribed grazing. Prescribed fire. State 2 submodel, plant communities
State 3 submodel, plant communities
State 1
ReferenceThe Reference state is characterized by three distinct plant community phases. The plant communities, and various successional stages between them, represent the natural range of variability within the Reference state.
Dominant plant species
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willow (Salix), shrub
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big bluestem (Andropogon gerardii), grass
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little bluestem (Schizachyrium scoparium), grass
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prairie cordgrass (Spartina pectinata), grass
Community 1.1
Big Bluestem and Little BluestemThis is the interpretive plant community for the Subirrigated Ecological Site. This community developed with grazing by large herbivores and is suited to grazing by domestic livestock. Historically, fires likely occurred infrequently, and were randomly distributed. This plant community can be found on areas where grazed plants receive adequate periods of recovery during the growing season. The potential vegetation is about 80 to 95 percent grasses and grass-likes, 5 to 10 percent forbs, and 0 to10 percent woody plants.
The major grasses include big bluestem, little bluestem, prairie cordgrass, Indiangrass, and switchgrass. Minor grasses include slender and western wheatgrass, basin wildrye, Canada wildrye, and foxtail barley. A minor component of grass-likes such as mountain rush (also known as Baltic rush), spikerush, and bulrush species, forbs such as horsetail, Pursh seepweed, and arrowgrass; Maximilian sunflower, white heath aster Pennsylvania smartweed, and false boneset; white sagebrush (also known as cudweed sagewort), Cuman ragweed, and milkvetch; and a minor component of shrubs, such as silver buffaloberry, western snowberry, Woods’ rose, and willows are also present.
In the 12 to 14 inch precipitation zone (PZ), the total annual production (air-dry weight) is about 3,400 pounds per acre during an average year, but ranges from about 3,500 pounds per acre in unfavorable years to about 4,500 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is about 4,500 pounds per acre during an average year, but ranges from about 4,000 pounds per acre in unfavorable years to about 5,000 pounds per acre in above-average years.
Community dynamics (nutrient and water cycles, and energy flow) are functioning properly. Infiltration rates are moderate, and soil erosion is low. Litter is properly distributed where vegetative cover is continuous. Decadence and natural plant mortality are low. This community is resistant to many disturbances except heavy, continuous grazing, tillage or development into urban or other uses.Dominant plant species
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willow (Salix), shrub
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big bluestem (Andropogon gerardii), grass
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little bluestem (Schizachyrium scoparium), grass
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prairie cordgrass (Spartina pectinata), grass
Figure 9. Annual production by plant type (representative values) or group (midpoint values)
Figure 10. Plant community growth curve (percent production by month). WY1106 , 12-14SP Free water sites w/warm - WL, Sb, SS.
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 5 15 20 30 20 10 0 0 0 Community 1.2
Little Bluestem and Mountain RushBig bluestem, prairie cordgrass, Indiangrass, switchgrass, and Canada wildrye have been significantly reduced. Little bluestem may initially increase or decrease depending upon season of use. Grass-likes such as Mountain rush (also known as Baltic rush), has increased. Kentucky bluegrass has begun to invade. Forbs and shrubs are still present in small amounts. This plant community is at risk of losing tall warm-season grasses, palatable forbs, and shrubs.
In the 12 to 14 inch PZ, the total annual production (air-dry weight) is about 2,800 pounds per acre during an average year, but ranges from about 2,200 pounds per acre in unfavorable years to about 3,400 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is about 3,200 pounds per acre during an average year, but ranges from about 2,600 pounds per acre in unfavorable years to about 3,800 pounds per acre in above-average years.
Total aboveground biomass has been reduced. Reduction of tall warm-season grasses and cool-season rhizomatous wheatgrasses, nitrogen-fixing forbs, and increased sod-forming grasses and grass-likes, have begun to alter the biotic integrity of this community. Water and nutrient cycles may be impaired.
Nearly all plant species typically found in the Reference Plant Community are present and will respond to changes in grazing management.Dominant plant species
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willow (Salix), shrub
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little bluestem (Schizachyrium scoparium), grass
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mountain rush (Juncus arcticus ssp. littoralis), grass
Figure 11. Plant community growth curve (percent production by month). WY1103 , 12-14SP Free water w/o warm - WL, Sb, SS.
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 5 20 25 25 15 10 0 0 0 Community 1.3
Big Bluestem and Little Bluestem, Excessive LitterThis plant community developed under the absence of grazing and fire. Plant species resemble the Reference Plant Community however, frequency and production are reduced. Standing dead canopy prevents sunlight from reaching plant crowns. Much of the available nutrients are tied up in standing dead plant material and litter. Eventually, litter levels can become high enough to cause decadence and mortality of the stand. Bunchgrasses, such as little bluestem, slender wheatgrass, Indiangrass, and switchgrass, typically develop dead centers and rhizomatous grasses can form small decadent communities due to a lack of impact by grazing animals. The semiarid environment and the absence of animal traffic to break down litter slows nutrient recycling.
Water flow patterns and pedestalling become apparent. Infiltration is reduced and runoff is increased. In advanced states of non-use or lack of fire, bare areas increase causing an erosion concern.
In the 12 to 14 inch PZ, the total annual production (air-dry weight) is about 3,500 pounds per acre during an average year, but ranges from about 3,100 pounds per acre in unfavorable years to about 3,900 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is about 3,800 pounds per acre during an average year, but ranges from about 3,400 pounds per acre in unfavorable years to about 4,200 pounds per acre in above-average years.
Total annual production can vary substantially.Dominant plant species
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willow (Salix), shrub
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big bluestem (Andropogon gerardii), grass
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little bluestem (Schizachyrium scoparium), grass
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prairie cordgrass (Spartina pectinata), grass
Figure 12. Plant community growth curve (percent production by month). WY1103 , 12-14SP Free water w/o warm - WL, Sb, SS.
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 5 20 25 25 15 10 0 0 0 Pathway 1.1A
Community 1.1 to 1.2Frequent and severe defoliation without adequate recovery between grazing events and lack of fire shifts this plant community to the 1.2 Community. Drought accelerates this process. Recurring spring seasonal grazing decreases cool-season plants. Conversely, recurring summer grazing decreases warm-season plants and tends to increase cool-season plants over time. Biotic integrity and the water and nutrient cycles may become impaired as a result of this community pathway.
Key drivers
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Livestock grazing or browsing
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Fire frequency
Pathway 1.1B
Community 1.1 to 1.3Non-use and lack of fire cause the Reference Plant Community to shift to the 1.3 Community. Plant decadence and standing dead plant material impede energy flow. Initially, excess litter increases. Eventually, native plant density begins to decrease and annuals and introduced species may begin to invade. Water and nutrient cycles are impaired as a result of this community pathway.
Key drivers
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Livestock grazing or browsing
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Fire frequency
Pathway 1.2A
Community 1.2 to 1.1Grazing that allows for adequate recovery between grazing events, proper stocking rates, and prescribed fire shift this community back toward the Reference Plant Community.
Conservation practices
Prescribed Burning Prescribed Grazing Key drivers
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Livestock grazing or browsing
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Fire frequency
Pathway 1.3A
Community 1.3 to 1.1The return of grazing with adequate recovery and normal fire frequency shifts this plant community toward the Reference Plant Community. This change can occur in a relatively short time frame with the return of these disturbances.
Conservation practices
Prescribed Burning Prescribed Grazing Key drivers
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Livestock grazing or browsing
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Fire frequency
State 2
Sod BoundAn ecological threshold has been crossed and a significant amount of production and diversity has been lost when compared to the Reference state. Significant biotic and soil changes have negatively impacted energy flow and the nutrient and hydrologic cycles.
This is a very stable state, resistant to change due to the high tolerance of Kentucky bluegrass to grazing, the development of a shallow root system (root pan), and subsequent changes in hydrology and nutrient cycling. The loss of other functional/structural groups such as warm and cool-season bunch and rhizomatous grasses, forbs, and shrubs reduces the biodiversity productivity of this site.Dominant plant species
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Kentucky bluegrass (Poa pratensis), grass
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mountain rush (Juncus arcticus ssp. littoralis), grass
Community 2.1
Kentucky Bluegrass and Mountain RushThe tall and mid-grasses, and palatable forbs have been eliminated. Kentucky bluegrass has fully invaded the community and persists in a sod-bound condition. Mountain rush, various sedges, and foxtail barley have increased. Remnant amounts of western wheatgrass may still persist in localized colonies. Big bluestem, little bluestem, prairie cordgrass, Indiangrass, and switchgrass have been removed. Annual weeds such as burningbush and Russian thistle have also invaded.
The plant community lacks diversity and is resistant to change. Energy flow and water and mineral cycles have been negatively affected. Litter levels are very low and unevenly distributed.
In the 12 to 14 inch PZ, the total annual production (air-dry weight) is about 2,000 pounds per acre during an average year, but ranges from about 1,600 pounds per acre in unfavorable years to about 2,400 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is about 2,300 pounds per acre during an average year, but ranges from about 1,800 pounds per acre in unfavorable years to about 2,800 pounds per acre in above-average years.Dominant plant species
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Kentucky bluegrass (Poa pratensis), grass
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mountain rush (Juncus arcticus ssp. littoralis), grass
Figure 13. Plant community growth curve (percent production by month). WY1103 , 12-14SP Free water w/o warm - WL, Sb, SS.
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 5 20 25 25 15 10 0 0 0 State 3
Increased Bare GroundAn ecological threshold has been crossed. The Increased Bare Ground state denotes changes in infiltration, runoff, aggregate stability, and species composition. The changes in water movement and the plant community affect changes in hydrologic functionality, biotic integrity, and soil and site stability. Infiltration, runoff, and soil erosion vary depending upon the vegetation present. Erosion and loss of organic matter and carbon reserves are concerns.
Dominant plant species
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Kentucky bluegrass (Poa pratensis), grass
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foxtail barley (Hordeum jubatum), grass
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burningbush (Bassia scoparia), other herbaceous
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Russian thistle (Salsola), other herbaceous
Community 3.1
Kentucky Bluegrass and Foxtail BarleyKentucky bluegrass and foxtail barley dominate this community; however, areas of sod have been removed, resulting in a broken sod-bound appearance. Bare ground may be a concern if water table levels are low. Annual invasive forbs and grasses include burningbush, Russian thistle, and cheatgrass. Noxious weeds, such as Dalmatian toadflax and leafy spurge may invade. Forage palatability for livestock is low.
In the 12 to 14 nch PZ, the total annual production (air-dry weight) is about 1,600 pounds per acre during an average year, but ranges from about 1,300 pounds per acre in unfavorable years to about 1,900 pounds per acre in above-average years.
In the 15 to 17 inches PZ, the total annual production (air-dry weight) is about 1,800 pounds per acre during an average year, but ranges from about 1,400 pounds per acre in unfavorable years to about 2,200 pounds per acre in above-average years.
This plant community is very resistant to change because of the lack of native species and the amount of invasive species present.
Wind and water erosion may occur if bare ground has increased. Litter amounts are greatly reduced. Mineral crusting caused by raindrop impact disrupts surface soil aggregates, increasing ponding and slowing infiltration. Continued heavy use will cause severe compaction problems.Dominant plant species
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Kentucky bluegrass (Poa pratensis), grass
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foxtail barley (Hordeum jubatum), grass
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burningbush (Bassia scoparia), other herbaceous
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Russian thistle (Salsola), other herbaceous
Figure 14. Plant community growth curve (percent production by month). WY1103 , 12-14SP Free water w/o warm - WL, Sb, SS.
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 5 20 25 25 15 10 0 0 0 Transition T1A
State 1 to 2Frequent and severe defoliation without adequate recovery periods between grazing events and lack of fire shifts this plant community across an ecological threshold to the Sod-bound State. Biotic integrity and hydrologic function are impaired because of this transition.
Key drivers
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Livestock grazing or browsing
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Fire frequency
Transition T2A
State 2 to 3Long-term frequent and severe defoliation without adequate recovery between grazing events and lack of fire cause a shift across an ecological threshold to the Increased <a class="species-link" href="https://plants.usda.gov/core/profile?symbol=2BARE" target="_blank" title="Open in plants.usda.gov"><i>Bare Ground</i></a> State. Erosion and loss of organic matter along with invasion of introduced plants and noxious weeds are resource concerns.
Key drivers
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Livestock grazing or browsing
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Fire frequency
Additional community tables
Table 5. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 12 2400–2600 big bluestem ANGE Andropogon gerardii 800–1000 – little bluestem SCSC Schizachyrium scoparium 600–800 – Indiangrass SONU2 Sorghastrum nutans 200–600 – prairie cordgrass SPPE Spartina pectinata 400–600 – switchgrass PAVI2 Panicum virgatum 200–400 – 2 12 400–800 slender wheatgrass ELTR7 Elymus trachycaulus 200–400 – basin wildrye LECI4 Leymus cinereus 0–400 – western wheatgrass PASM Pascopyrum smithii 200–400 – 3 12 200–400 sedge CAREX Carex 200–400 – spikerush ELEOC Eleocharis 0–80 – mountain rush JUARL Juncus arcticus ssp. littoralis 0–80 – bulrush SCIRP Scirpus 0–80 – 4 200–400 Grass, perennial 2GP Grass, perennial 0–200 – Canada wildrye ELCA4 Elymus canadensis 0–200 – foxtail barley HOJU Hordeum jubatum 0–200 – bluegrass POA Poa 0–200 – alkali sacaton SPAI Sporobolus airoides 0–200 – 7 15 2700–2925 big bluestem ANGE Andropogon gerardii 900–1125 – little bluestem SCSC Schizachyrium scoparium 675–900 – Indiangrass SONU2 Sorghastrum nutans 225–675 – prairie cordgrass SPPE Spartina pectinata 450–675 – switchgrass PAVI2 Panicum virgatum 225–450 – 8 15 450–900 slender wheatgrass ELTR7 Elymus trachycaulus 225–450 – basin wildrye LECI4 Leymus cinereus 0–450 – western wheatgrass PASM Pascopyrum smithii 225–450 – 9 15 225–450 sedge CAREX Carex 225–450 – spikerush ELEOC Eleocharis 0–90 – rush JUNCU Juncus 0–90 – bulrush SCIRP Scirpus 0–90 – 10 225–450 Grass, perennial 2GP Grass, perennial 0–225 – Canada wildrye ELCA4 Elymus canadensis 0–225 – foxtail barley HOJU Hordeum jubatum 0–225 – bluegrass POA Poa 0–225 – alkali sacaton SPAI Sporobolus airoides 0–225 – Forb5 12 200–400 Forb, perennial 2FP Forb, perennial 0–200 – Cuman ragweed AMPS Ambrosia psilostachya 0–80 – white sagebrush ARLU Artemisia ludoviciana 0–80 – milkvetch ASTRA Astragalus 0–80 – false boneset BREU Brickellia eupatorioides 0–80 – horsetail EQUIS Equisetum 0–80 – American licorice GLLE3 Glycyrrhiza lepidota 0–80 – Maximilian sunflower HEMA2 Helianthus maximiliani 0–80 – Pennsylvania smartweed POPE2 Polygonum pensylvanicum 0–80 – Pursh seepweed SUCA2 Suaeda calceoliformis 0–80 – white heath aster SYER Symphyotrichum ericoides 0–80 – arrowgrass TRIGL Triglochin 0–80 – 11 15 225–450 Forb, perennial 2FP Forb, perennial 0–225 – Cuman ragweed AMPS Ambrosia psilostachya 0–90 – white sagebrush ARLU Artemisia ludoviciana 0–90 – milkvetch ASTRA Astragalus 0–90 – false boneset BREU Brickellia eupatorioides 0–90 – horsetail EQUIS Equisetum 0–90 – American licorice GLLE3 Glycyrrhiza lepidota 0–90 – Maximilian sunflower HEMA2 Helianthus maximiliani 0–90 – Pennsylvania smartweed POPE2 Polygonum pensylvanicum 0–90 – Pursh seepweed SUCA2 Suaeda calceoliformis 0–90 – white heath aster SYER Symphyotrichum ericoides 0–90 – arrowgrass TRIGL Triglochin 0–90 – Shrub/Vine6 0–400 willow SALIX Salix 0–400 – silver buffaloberry SHAR Shepherdia argentea 0–200 – western snowberry SYOC Symphoricarpos occidentalis 0–200 – Shrub (>.5m) 2SHRUB Shrub (>.5m) 0–200 – rose ROSA5 Rosa 0–200 – 12 0–450 willow SALIX Salix 0–450 – silver buffaloberry SHAR Shepherdia argentea 0–225 – western snowberry SYOC Symphoricarpos occidentalis 0–225 – Shrub (>.5m) 2SHRUB Shrub (>.5m) 0–225 – rose ROSA5 Rosa 0–225 – Table 6. Community 1.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 7. Community 1.3 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 8. Community 2.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 9. Community 3.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Animal community
Reference Plant Community—Big Bluestem, Little Bluestem, Prairie Cordgrass:
Common birds expected in the Reference Plant Community include lark and grasshopper sparrow, chestnut collared longspur, lark bunting, western meadowlark, and ferruginous and Swainson’s hawks. This site provides excellent nesting habitat for pheasant and waterfowl if other habitat elements, such as cropland and shallow water are nearby.
1.2 Community— Reduced Warm-season Tall and Midgrasses, Increased Cool-season Grasses and Grass-likes:
All Reference Plant Community species are expected in these plant communities. However, the reduction in the tall grass species in these plant communities make them less diverse, and thus, less apt to meet all seasonal needs.
1.3 Community—Excessive Litter, Decadent Plants, and Standing Dead Canopy:
This community has reduced habitat value for most wildlife species found in the Reference Plant Community.
2.1 Community— Kentucky Bluegrass-Invaded:
The shift away from tallgrasses to short and midgrasses and grass-like species results in a change in bird species to killdeer, McCown's longspur, horned lark, and long-billed curlew.
3.1 Community— Kentucky Bluegrass, Foxtail Barley, Annual Forbs, Noxious Weeds:
This community has low habitat value for most wildlife species.
Grazing Interpretations:
The following table is a guide to stocking rates for the plant communities described in the Subirrigated site. These are conservative estimates for initial planning. On-site conditions will vary, and stocking rates should be adjusted based on range inventories, animal kind/class, forage availability (adjusted for slope and distance to water), and the type of grazing system (number of pastures, planned moves, etc.), all of which is determined in the conservation planning process.
The following stocking rates are based on the total annual forage production in a normal year multiplied by 25 percent harvest efficiency of preferred and desirable forage species, divided by 912 pounds of ingested air-dry vegetation for an animal unit per month (Natl. Range and Pasture Handbook, 1997). An animal unit month (AUM) is defined as the amount of forage required by one mature cow, for one month.
Plant Community (PC) Production (total lbs. /acre in a normal year) and Stocking Rate (AUMs/acre) are listed below:
Example: Reference PC – (4000) (1.1)
4,000 lbs. per acre X 25% Harvest Efficiency = 1,000 lbs. forage demand for one month. Then, 1,000 lbs. per acre/912 demand per AUM =1.1
Plant Community (PC) Production (lbs.ac), and Stocking Rate (AUM/Acre)
12-14” PZ:
Reference PC - (4000) (1.1)
1.2 PC - (2800) (0.77)
2.1 PC - (2000) (0.55)
15-17” PZ
Reference PC - (4500) (1.23)
1.2 PC - (3200) (0.88)
2.1 PC - (2300) (0.63)
Grazing by domestic livestock is one of the major income-producing industries in the area. Rangelands in this area provide year-long forage under prescribed grazing for cattle, sheep, horses, and other herbivores. During the dormant period, livestock may need supplementation based on reliable forage analysis.
An on-site inventory is required prior to developing a grazing plan.Hydrological functions
Climate 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 moderately 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 percent ground cover have the greatest potential for high infiltration and lower runoff. An example of an exception would be where shortgrasses form a strong sod and dominate the site. Areas where ground cover is less than 50 percent have the greatest potential to have reduced infiltration and higher runoff (refer to NRCS Section 4, National Engineering Handbook (USDA–NRCS, 1972–2012) for runoff quantities and hydrologic curves).
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 to 2 percent of the soil surface.Recreational uses
This site provides hunting, hiking, photography, bird watching, and other opportunities. The wide varieties of plants that bloom from spring until fall have an aesthetic value that appeals to visitors.
Wood products
No appreciable wood products are present on the site.
Other products
Site Development & Testing Plan
General Data (MLRA and Revision Notes, Hierarchical Classification, Ecological Site Concept, Physiographic, Climate, and Water Features, and Soils Data):
Updated. All “Required” items complete to Provisional level.
Community Phase Data (Ecological Dynamics, STM, Transition & Recovery Pathways, Reference Plant Community, Species Composition List, Annual Production Table):
Updated. All “Required” items complete to Provisional level.
Annual Production Table is from the “Previously Approved” ESD (2008).
Growth Curves are from the “Previously Approved” ESD (2008).
The Annual Production Table, Species Composition List, and Growth Curves will be reviewed for future updates at Approved level.
Each Alternative State/Community:
Complete to Provisional level
Supporting Information (Site Interpretations, Assoc. & Similar Sites, Inventory Data References, Agency/State Correlation, References):
Updated. All “Required” items complete to Provisional level.
Wildlife Interpretations: Plant community names updated. Narrative is from “Previously Approved” ESD (2008). Wildlife species will need to be updated at the next Approved level.
Livestock Interpretations: Plant community names and stocking rates updated.
Hydrology, Recreational Uses, Wood Products, and Other Products carried over from previously “Approved” ESD (2008).
Plant Preferences tabled removed. Will be released as a technical guide notice by NE and WY state offices in the future.
Existing NRI or 417 Inventory Data References updated. More field data collection is needed to support this site concept.
Reference Sheet:
Rangeland Health Reference Sheet carried over from previously “Approved” ESD (2008).
It will be updated at the next “Approved” level.
“Future work, as described in a project plan, to validate the information in this provisional ecological site description is needed. This will include field activities to collect low and medium intensity sampling, soil correlations, and analysis of that data. Annual field reviews should be done by soil scientists and vegetation specialists. A final field review, peer review, quality control, and quality assurance reviews of the ESD will be needed to produce the final document.” (NI 430_306 ESI and ESD, April, 2015)Supporting information
Inventory data references
Data Source: 417s Number of Records: 1 Sample Period: 1980 States: NE Counties: Morrill Information presented here has been derived from data collection on private and federal lands using: • Double Sampling (clipped 2 of 5 plots)* • Rangeland Health (Pellant et al., 2005) • Soil Stability (Pellant et al., 2005) • Line Point Intercept : Foliar canopy, basal cover (Forb, Graminoid, Shrub, subshrub, Lichen, Moss, Rock fragments, bare ground, % Litter) (Herrick et al., 2005) • Soil pedon descriptions collected on site (Schoeneberger et al., 2012) *NRCS double-sampling method, CO NRCS Similarity Index Worksheet 528(1). Additional reconnaissance data collection using numerous ocular estimates and other inventory data; NRCS clipping data for USDA program support; Field observations from experienced range trained personnel. Specific data information is contained in individual landowner/user case files and other files located in county NRCS field offices.
References
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Stewart, O.C., H.T. Lewis, and M.K. Anderson. 2002. Forgotten Fires: Native Americans and the Transient Wilderness. University of Oklahoma Press, Norman, OK. 351p.
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Additional References
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http://www.glti.nrcs.usda.gov/technical/publications/nrph.html. Accessed 26 February, 2018.
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Hart, R. 2001. Plant biodiversity on shortgrass steppe after 55 years of zero, light, moderate, or heavy cattle grazing. Plant Ecology, 155, 111-118.
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Schoeneberger, P.J., D.A. Wysockie, 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.
Stahl, David W., E.R. Cook, M.K. Cleaveland, M.D. Therrell, D.M. Meko, H.D. Grissino-Mayer, E. Watson, and B.H. Luckman. Tree-ring data document 16th century megadrought over North America. 2000. Eos, 81(12), 121-125.
Zelikova, Tamara Jane, D.M. Blumenthal, D.G. Williams, L. Souza, D.R. LeCain, J.Morgan. 2014. Long-term exposure to elevated CO2 enhances plant community stability by suppressing dominant plant species in a mixed-grass prairie. Ecology, 2014. Available online. www.pnas.org/cgi/doi/10.1073/pnas.1414659111.
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U.S. Dept. of Agriculture, Natural Resources Conservation Service. 1972-2012. National Engineering Handbook Hydrology Chapters. Available online. http://www.nrcs.usda.gov/wps/portal/nrcs/detailfull/national/water/?&cid=stelprdb1043063. Accessed August, 2015.
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U.S. Dept. of Agriculture, Natural Resources Conservation Service. Web Soil Survey. Available online. http://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx. Accessed 15 November, 2017.
Data collection for this ecological site was done in conjunction with the progressive soil surveys within the 67A Central High Plains (Northern Part) of Nebraska, Wyoming, and Colorado. It has been mapped and correlated with soils in the following soil surveys:
U.S. Dept. of Agriculture.1994. Soil Survey of Banner County, Nebraska.
U.S. Dept. of Agriculture. 1997. Soil Survey of Cheyenne County, Nebraska.
U.S. Dept. of Agriculture. 1999. Soil Survey of Garden County, Nebraska.
U.S. Dept. of Agriculture. 2005. Soil Survey of Kimball County, Nebraska.
U.S. Dept. of Agriculture. 1985. Soil Survey of Morrill County, Nebraska.
U.S. Dept. of Agriculture. 1968 Soil Survey of Scotts Bluff County, Nebraska.
U.S. Dept. of Agriculture.2013. Soil Survey of Scotts Bluff National Monument, Nebraska.
U.S. Dept. of Agriculture. 1998. Soil Survey of Sioux County, Nebraska.
U.S. Dept. of Agriculture. 1981. Soil Survey of Goshen County, Northern Part, Wyoming.
U.S. Dept. of Agriculture. 1971. Soil Survey of Goshen County, Southern Part, Wyoming.
U.S. Dept. of Agriculture. 1983. Soil Survey of Laramie County, Eastern Part, Wyoming.
U.S. Dept. of Agriculture. 2001. Soil Survey of Laramie County, Western Part, Wyoming.
U.S. Dept. of Agriculture. 2003. Soil Survey of Platte County, Wyoming.
U.S. Dept. of Agriculture. 1982. Soil Survey of Weld County, Northern Part, Colorado.
For manuscripts of archived soil surveys, see: https://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx.Contributors
Kimberly Diller, Ecological Site Specialist, NRCS MLRA SSO, Pueblo CO
Andy Steinert, MLRA 67B Soil Survey Leader, NRCS MLRA SSO, Fort Morgan, CO
Doug Whisenhunt, Ecological Site Specialist, NRCS MLRA SSO, Pueblo COApproval
Kirt Walstad, 11/29/2024
Acknowledgments
Partners/Contributors: David Cook, Rangeland Management Specialist, NRCS, Oshkosh, NE George Gamblin, Rangeland Management Specialist, NRCS, Wheatland, WY Cameron Clark, Resource Soil Scientist, NRCS, Douglas, WY Angie Elg, Resource Soil Scientist, NRCS, Scottsbluff, NE Tim Becket, Area Resource Conservationist, Douglas, WY Mitchell Stephenson, Ph.D. Rangeland Management Specialist, UNL-Panhandle Research Station, Scottsbluff, NE Kristin Dickinson, District Conservationist, NRCS, Sidney, NE Rick Peterson, Ecological Site Inventory Specialist, SD-NRCS-MLRA SSO, Rapid City, SD Program Support: Nadine Bishop, NE State Rangeland Management Specialist/ QC, NRCS, Imperial, NE John Hartung, WY State Rangeland Management Specialist/ QC, NRCS, Casper, WY David Kraft, NRCS MLRA Ecological Site Specialist-QA, Emporia, KS James Bauchert, WY State Soil Scientist, WY-NRCS, Casper, WY Neil Dominy, NE State Soil Scientist, NRCS, Lincoln, NE Britt Weiser, NE State Resource Conservationist, NRCS, Lincoln, NE Clayton Schmitz, WY State Resource Conservationist, NRCS, Casper, WY Carla Green Adams, Editor, NRCS-SSR5, Denver, CO Chad Remley, Regional Director, N. Great Plains Soil Survey, Salina, KS Those involved in developing the 2008 version: Chuck Ring, Rangeland Management Specialist, WY-NRCS, and Everett Bainter, WY State Rangeland Management Specialist, WY-NRCS Non-discrimination statement In accordance with Federal civil rights law and U.S. Department of Agriculture (USDA) civil rights regulations and policies, the USDA, its Agencies, offices, and employees, and institutions participating in or administering USDA programs are prohibited from discriminating based on race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, family/parental status, income derived from a public assistance program, political beliefs, or reprisal or retaliation for prior civil rights activity, in any program or activity conducted or funded by USDA (not all bases apply to all programs). Remedies and complaint filing deadlines vary by program or incident. Persons with disabilities who require alternative means of communication for program information (e.g., Braille, large print, audiotape, American Sign Language, etc.) should contact the responsible Agency or USDA's TARGET Center at (202) 720-2600 (voice and TTY) or contact USDA through the Federal Relay Service at (800) 877-8339. Additionally, program information may be made available in languages other than English. To file a program discrimination complaint, complete the USDA Program Discrimination Complaint Form, AD-3027, found online at How to File a Program Discrimination Complaint and at any USDA office or write a letter addressed to USDA and provide in the letter all of the information requested in the form. To request a copy of the complaint form, call (866) 632-9992. Submit your completed form or letter to USDA by: (1) mail: U.S. Department of Agriculture, Office of the Assistant Secretary for Civil Rights, 1400 Independence Avenue, SW, Washington, D.C. 20250-9410; (2) fax: (202) 690-7442; or (3) email: program.intake@usda.gov.
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) Dave Cook, Kristin Dickinson, George Gamblin, John Hartung, Andy Steinert, Nadine Bishop Contact for lead author Date 11/23/2020 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
None. Rills are not expected on the site. -
Presence of water flow patterns:
None. Water flow patterns are not expected on the site. -
Number and height of erosional pedestals or terracettes:
None. Erosional pedestals and/or terracettes are not expected on the site. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground is typically less than 5 percent. -
Number of gullies and erosion associated with gullies:
None. Gullies should not be present on this site. -
Extent of wind scoured, blowouts and/or depositional areas:
None. Wind-scoured and/or depositional areas are not present on the site. -
Amount of litter movement (describe size and distance expected to travel):
Litter should fall in place. Slight amount of movement of fine litter from water is possible, but not normal. Litter movement from wind is not expected. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil aggregated stability ratings should typically be 5 to 6. Surface organic matter adheres to the soil surface. Soil surface peds will typically retain their structure indefinitely when dipped in distilled water. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
The surface layer ranges from 4 to 10 inches (10.2-25.4 cm) thick. Soil colors range from dark gray, gray, grayish brown, brown, gray, light brownish gray, dark grayish brown, or dark grayish brown (values of 4 to 6) when dry and very dark gray, very dark grayish brown, dark brown, dark gray, or dark grayish brown (value 3 to 4) when moist. Soil surface structure is typically granular. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
The functional/structural groups provide a combination of rooting depths and structure which positively influences infiltration. Combination of shallow and deep rooted species (mid & tall rhizomatous and tufted perennial cool season grasses) with fine and coarse roots positively influences infiltration. The expected composition of the plant community is 80 to 95 percent perennial grasses and grass-likes, 5 to 10 percent forbs, and 0 to 10 percent shrubs and trees. In the 12-14” PZ, the grass and grass-like component is made up of warm-season tall rhizomatous grasses (50-60%); warm-season, tall and mid, bunch grasses (20-30%); cool-season, rhizomatous grasses (10-20%); cool-season, bunch grasses (6-12%); grass-likes (6-12%). In the 15-17” PZ, the grass and grass-like component is made up of warm-season tall and mid, rhizomatous grasses (45-50%); warm-season, tall and mid, bunch grasses (20-30%); cool-season, rhizomatous grasses (5-10%); cool-season, bunch grasses (5-10%); grass-likes (5-10%). -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None. A compaction layer is not expected on this site. -
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:
12-14” PZ: Community 1.1 1. Native, C4, tall, rhizomatous grasses – 1700-2050 #/ac (50-60%), 4 species minimum 15-17” PZ: Community 1.1 1. Native, C4, tall, rhizomatous grasses – 1800-2250 #/ac (40-50%), 4 species minimumSub-dominant:
12-14” PZ: Community 1.1 2, Native, C4, tall, and mid- bunch grasses – 700-1050 #/ac (20-30%), 1 species minimum 3. Native, C4, tall, and mid- bunch grasses – 700-1050 #/ac (20-30%), 1 species minimum 15-17” PZ: Community 1.1 2. Native, C4, tall and mid, bunch grasses – 675-1125 #/ac (15-25%), 1 speciesOther:
Minor: 12-14” PZ: Community 1.1 4. Grass-likes – 170-340 #/ac (5-10%) 5. Native, C3, bunch grasses – 170-340 #/ac (5-10%) 6. Native, Perennial and Annual Forbs – 170-340 #/ac (5-10%) 7. Shrubs, Vines, Cacti – 0-340 #/ac (0-10%) 15-17” PZ: Community 1.1 3. Native, C3, rhizomatous grasses – 225-450 (5-10%) 4. Native, C3, bunch grasses – 225-450 (5-10%) 5. Grass-likes – 225-450 (5-10%) 6. Native, Perennial and Annual Forbs – 225-450 (5-10%) 7. Shrubs, Vines, Cacti – 0-450 #/ac (0-10%)Additional:
12-14” PZ: Community 1.1 12a. Relative Dominance: Native, C4, tall, rhizomatous grasses >> Native, C4, tall and mid- bunch grasses > Native, C3, rhizomatous grasses > Grass-likes = Native, C3, bunch grasses = Native, Annual or Perennial Forbs >Shrubs, Cacti, Vines 12b. F/S Groups not expected for the site: Introduced annual grasses, perennial introduced and naturalized grasses, trees. 12c. Number of F/S Groups: 7 12d. Species number in Dominant and Sub-dominant F/S Groups: 6 15-17” PZ: Community 1.1 12a. Relative Dominance: Native, C4, tall, rhizomatous grasses >> Native, C4, tall and mid, bunch grasses > Native, C3, rhizomatous grasses = Native, C3, bunch grasses = Grass-likes = Native, Annual or Perennial Forbs > Shrubs, Cacti, Vines 12b. F/S Groups not expected for the site: Introduced annual grasses, perennial introduced and naturalized grasses, trees. 12c. Number of F/S Groups: 7 12d. Species number in Dominant and Sub-dominant F/S Groups: 5 -
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Very little evidence of decadence or mortality. Bunch grasses have strong, healthy centers with less than 3 percent mortality and shrubs have few dead stems. -
Average percent litter cover (%) and depth ( in):
Plant litter cover is evenly distributed throughout the site and is expected to be 80 to 90 percent. Litter depths range from 0.50 to 1 inch (1.3-2.6 cm). Kentucky bluegrass excessive litter can negatively impact the functionality of this site. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
In the 12-14” precipitation zone, annual production ranges from 3,500 to 4,500 pounds per acres (air dry basis). Average annual production is 3,400 pounds per acre under normal precipitation and weather conditions. In the15-17” Precipitation Zone, annual production ranges from 4,000 to 5,000 pounds per acre (air dry basis). Average annual production is 4,500 pounds per acre under normal precipitation and weather conditions. No significant reduction is expected the growing season following wildfire. -
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:
Kentucky bluegrass, quackgrass, reed canarygrass, leafy spurge, Canada thistle, musk thistle, Russian olive, saltcedar (tamarix), and others as they become known. See: Colorado Department of Agriculture Invasive Species Website: <a class="narrative-citation-link" href="https://www.colorado.gov/pacific/agconservation/noxious-weed-species" target="_blank">https://www.colorado.gov/pacific/agconservation/noxious-weed-species</a> Wyoming Weed and Pest Council Website: <a class="narrative-citation-link" href="https://wyoweed.org/" target="_blank">https://wyoweed.org/</a> Nebraska Invasive Species website: <a class="narrative-citation-link" href="https://neinvasives.com/plants" target="_blank">https://neinvasives.com/plants</a>. -
Perennial plant reproductive capability:
All perennial species exhibit high vigor relative to recent weather conditions. Perennial grasses should have vigorous rhizomes or tillers; vegetative and reproductive structures are not stunted. All perennial species should be capable of reproducing annually.
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PrintThe Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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