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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). MLRA’s 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 Loamy 12 to 17 inch Precipitation Zone (PZ) site was developed by an earlier version of the Loamy (Ly) 12 to 17 inch ESD (2005, updated 2008). The earlier version of the Loamy ESDs were based on input from NRCS (formerly Soil Conservation Service) and historical information obtained from the Loamy 12 to14 Southern Plains (SP) and Loamy 15 to17 SP Range Site Descriptions (1988). 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 Loamy site is an upland site on soils more than 20 inches deep. It is not saline or alkaline, does not have a high volume of coarse fragments on the surface, occurs on nearly level to slightly sloping fans, interfluves, or hills or on nearly level terraces. The surface soil textures are loam, very fine sandy loam, or fine sandy loam, but may include silt loam. Subsoil textures are loam, clay loam, or sandy clay loam.
Associated sites
R067AY162WY Shallow (Sw)
This ecological site is commonly adjacent.
Similar sites
R067AY150WY Sandy (Sy)
The Sandy Ecological Site does not have subsoil textures that are loam, clay loam, or sandy clay loam.
R067AY126WY Loamy Overflow (LyO)
The Loamy Overflow Ecological Site is a run-on site.
R067AY104WY Clayey (Cy)
The Clayey Ecological Site surface soil textures are silty clay loam, silty clay, clay, clay loam, or loam.
Table 1. Dominant plant species
Tree Not specified
Shrub (1) Artemisia tridentata
(2) Krascheninnikovia lanataHerbaceous (1) Hesperostipa comata
(2) Pascopyrum smithiiPhysiographic features
This site occurs on nearly level to slightly sloping fans, interfluves, or terraces, and on footslopes or backslopes of hills on dissected plains or uplands.
Table 2. Representative physiographic features
Landforms (1) Fan
(2) Hill
(3) Interfluve
(4) Terrace
Runoff class Negligible to medium Flooding frequency None Ponding frequency None Elevation 3000 – 6500 ft Slope 0 – 9 % Ponding depth 0 in Water table depth 80 – 200 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) HARRISBURG 12WNW [USC00253605], Harrisburg, NE
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(2) CHUGWATER [USC00481730], Chugwater, WY
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(3) OLD FT LARAMIE [USC00486852], Yoder, WY
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(4) PHILLIPS [USC00487200], LaGrange, WY
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(5) WHEATLAND 4 N [USC00489615], Wheatland, WY
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(6) CHEYENNE [USW00024018], Cheyenne, WY
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(7) SCOTTSBLUFF HEILIG AP [USW00024028], Scottsbluff, NE
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(8) BRIDGEPORT [USC00251145], Bridgeport, NE
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(9) KIMBALL 2NE [USC00254440], Kimball, NE
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(10) OSHKOSH [USC00256385], Oshkosh, NE
">Influencing water features
There are no water features associated with this ecological site.
Soil features
The soils on this site are typically deep to very deep, but include moderately deep, well drained soils that formed from alluvium, eolian deposits, or loess; and moderately deep soils formed from residuum derived from sandstone or siltstone. They typically are in moderate to moderately rapid permeability classes, but range to moderately slow in some soils. The available water capacity is moderate but may range to low in some soils. The soil moisture regime is typically aridic ustic. The soil temperature regime is mesic.
The surface layer of the soils in this site are typically loam, very fine sandy loam, or fine sandy loam, but may include silt loam. The surface layer ranges from a depth of 5 to 12 inches thick. The subsoil is typically loam, clay loam, or sandy clay loam, but may include very fine sandy loam or silt loam. Rock fragments typically number 0 to 10 percent in the subsoil but may range up to 45 percent in some soils. Soils in this site are typically leached of carbonates from 6 to 40 inches or more; a few soils may have carbonates within 6 inches of the surface. These soils are susceptible to erosion by water and wind. The potential for water erosion accelerates with increasing slope.
Surface soil structure in the Loamy 12 to 17 inch PZ ecological site is fine to medium granular, and structure below the surface is prismatic and/or subangular blocky.
Major soil series correlated to this ecological site include: Albinas, Alliance, Altvan, Ascalon, Creighton, Duroc, Featherlegs, Hargreave, Hemingford, Keith, Noden, Norka, Nucla, Recluse, Rosebud, Satanta, Tripp, Wages, Weld, and Wolf.
Other soil series that have been correlated to this site include: Angora, Bridget, Cedak, Deight, Goshen, Keith-variant, Luman, Selpats, Thirtynine, and Ulysses.
The attributes listed in the following table represent 0 to 40 inches in depth or to the first restrictive layer.
Note: Revisions to soil surveys are on-going. 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. Kuma loam, Cheyenne Co., NE
Table 4. Representative soil features
Parent material (1) Alluvium
(2) Eolian deposits
(3) Loess
Surface texture (1) Loam
(2) Very fine sandy loam
(3) Fine sandy loam
Drainage class Well drained Permeability class Moderate to moderately rapid Soil depth 20 – 80 in Surface fragment cover <=3" 0 – 5 % Surface fragment cover >3" Not specified Available water capacity
(0-40in)4.8 – 8.8 in Calcium carbonate equivalent
(0-40in)0 – 10 % Electrical conductivity
(0-40in)0 – 2 mmhos/cm Sodium adsorption ratio
(0-40in)0 – 5 Soil reaction (1:1 water)
(0-40in)6.6 – 8.4 Subsurface fragment volume <=3"
(Depth not specified)0 – 45 % Subsurface fragment volume >3"
(Depth not specified)0 – 5 % Ecological dynamics
The information in this ESD, including the state-and-transition (STM) model 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/time controlled grazing strategies, and historical accounts.
The Loamy ecological site is characterized by four states: Reference, Sod-bound, Increased Bare Ground, and Tilled. The Reference State is characterized by cool-season mid bunchgrasses (needle and thread), cool-season mid- rhizomatous grasses (western wheatgrass and streambank, also known as thickspike wheatgrass), and warm-season shortgrass (blue grama). Secondary grasses and grass-likes include prairie Junegrass, alkali (Sandberg) bluegrass, and threadleaf sedge. Green needlegrass is found in greater abundance, in 15 to 17 precipitation zones, and on finer-textured soils. A minor component of forbs and shrubs are also present. The Sod-bound State is characterized by warm-season shortgrass (blue grama and buffalograss) and grasslikes (threadleaf sedge). The Increased Bare Ground State is characterized by annual grasses (sixweeks fescue), forbs (curlycup gumweed, hairy false goldenaster, and annuals), and shrubs (fringed sagewort, snakeweed, and pricklypear). Invasives include cheatgrass.
As this site begins to deteriorate from a combination of frequent and severe grazing during the growing season, bunchgrasses such as needle and thread and green needlegrass decrease in both frequency and production. Grasses such as blue grama and threadleaf sedge increase. Under continued frequent and severe defoliation with no rest periods, rhizomatous wheatgrasses also begin to decrease. Forbs and shrubs such as hairy goldenaster, fringed sagewort, and broom snakeweed also increase. If continued, the plant community becomes sod-bound, and all midgrasses may eventually be removed from the plant community. Over the long-term, this continuous use in combination with high stock densities results in a broken sod, with areas of bare ground developing, and species such as broom snakeweed and annual bromes (cheatgrass), invading.
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.
Mechanical treatment consisting of contour pitting, furrowing, terracing, chiseling, and disking has been practiced in the past. It was theorized that the use of this high-input technology would improve production and plant composition on rangeland. These high-cost practices have shown to have no significant long-term benefits on production or plant composition and have only resulted in a permanently rough ground surface. Prescribed grazing that mimics the historic grazing of herds of migratory herbivores, as described earlier, has been shown to result in desired improvements based on management goals for 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 textEcosystem states
T1A - Excessive grazing. Lack of fire. T1B - Excessive grazing. Lack of fire. T1C - Mechanical tillage. 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 4 submodel, plant communities
State 1
ReferenceThe Reference state is characterized by three distinct plant communities. 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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big sagebrush (Artemisia tridentata), shrub
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winterfat (Krascheninnikovia lanata), shrub
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needle and thread (Hesperostipa comata ssp. comata), grass
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western wheatgrass (Pascopyrum smithii), grass
Community 1.1
Needle and Thread and Western Wheatgrass
Figure 9. Loamy 10-17" PZ Ecological Site, Cheyenne Co., NE
This is the interpretive plant community for this site. It is well adapted to the Northern Great Plains climate. 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 75 to 90 percent grasses and grass-likes, 5 to15 percent forbs, and 5 to10 percent woody plants.
In the western portion of the MLRA, the plant community is predominately cool-season midgrasses, with a significant component of warm-season midgrasses. In the eastern portion of the MLRA, the plant community is predominantly warm-season with a significant cool-season component. The major grasses/grass-likes include needle and thread, blue grama, and rhizomatous wheatgrasses such as western wheatgrass. Secondary grasses include prairie Junegrass, streambank (thickspike) wheatgrass, alkali (Sandberg) bluegrass, green needlegrass and buffalograss. A variety of forbs and half-shrubs also occur, as shown in the Species Composition List. Shrubs are not abundant. Plant diversity is high.
In the 12 to 14 inch Precipitation Zone (PZ), the total annual production (air-dry weight) is 1,300 pounds per acre during an average year, but it ranges from 750 pounds per acre in unfavorable years to 1,750 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is 1,500 pounds per acre during an average year, but ranges from 1,000 pounds per acre in unfavorable years to 2,000 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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big sagebrush (Artemisia tridentata), shrub
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winterfat (Krascheninnikovia lanata), shrub
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needle and thread (Hesperostipa comata ssp. comata), grass
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western wheatgrass (Pascopyrum smithii), grass
Figure 10. Annual production by plant type (representative values) or group (midpoint values)
Figure 11. Plant community growth curve (percent production by month). WY1101 , 12-14SP Upland sites w/o warm seasons. 12-14" Precipitation Zone, Southern Plains (SP) without warm season (grass) species.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 25 40 15 5 10 0 0 0 Community 1.2
Needle and Thread and Blue GramaGrazing-tolerant species such as blue grama and threadleaf sedge have noticeably increased. Needle and thread may initially increase or decrease depending on the season of grazing use. Green needlegrass is nearly absent. Prairie clover species and other palatable forbs such as dotted gayfeather and penstemon are present in reduced amounts. Hairy false goldenaster, slimflower scurfpea, fringed sagewort, and broom snakeweed have increased.
In the 12 to 14 inch PZ, the total annual production (air-dry weight) is 900 pounds per acre during an average year, but ranges from 600 pounds per acre in unfavorable years to 1,200 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is 1,100 pounds per acre during an average year, but ranges from 750 pounds per acre in unfavorable years to 1,450 pounds per acre in above-average years.
Total aboveground biomass has been reduced. Reduction of rhizomatous wheatgrasses, nitrogen-fixing forbs, and increased warm-season shortgrasses 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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big sagebrush (Artemisia tridentata), shrub
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broom snakeweed (Gutierrezia sarothrae), shrub
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needle and thread (Hesperostipa comata ssp. comata), grass
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blue grama (Bouteloua gracilis), grass
Figure 12. Plant community growth curve (percent production by month). WY1101 , 12-14SP Upland sites w/o warm seasons. 12-14" Precipitation Zone, Southern Plains (SP) without warm season (grass) species.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 25 40 15 5 10 0 0 0 Community 1.3
Needle and Thread and Western Wheatgrass, Low Plant DensityThis plant community developed under many years of non-use and lack of fire. Plant species resemble the Reference community however, frequency and production are reduced. Eventually, litter levels can become high enough to cause decadence and mortality of the stand. Bunchgrasses typically develop dead centers and rhizomatous grasses can form small decadent communities due to a lack of impact by grazing animals. Much of the available nutrients are tied up in standing dead plant material and increased amounts of litter. The semiarid environment and the absence of animal traffic to break down litter slows nutrient recycling.
Cool-season grasses and pricklypear have typically increased. Blue grama is reduced. Noxious weeds such as Canada thistle, leafy spurge, and Dalmatian toadflax may invade if a seed source is readily available. Invasive grasses such as cheatgrass tend to encroach under these conditions. Water flow patterns and pedestalling may become apparent. Infiltration is reduced and runoff is increased. In advanced stages 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 1,200 pounds per acre during an average year, but ranges from 800 pounds per acre in unfavorable years to 1,600 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is 1,400 pounds per acre during an average year, but ranges from 950 pounds per acre in unfavorable years to 1,850 pounds per acre in above-average years.Dominant plant species
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big sagebrush (Artemisia tridentata), shrub
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winterfat (Krascheninnikovia lanata), shrub
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needle and thread (Hesperostipa comata ssp. comata), grass
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western wheatgrass (Pascopyrum smithii), grass
Figure 13. Plant community growth curve (percent production by month). WY1101 , 12-14SP Upland sites w/o warm seasons. 12-14" Precipitation Zone, Southern Plains (SP) without warm season (grass) species.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 25 40 15 5 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 toward the 1.2 Community. Drought accelerates this process. Biotic integrity, water, and nutrient cycles may become impaired.
Conservation practices
Prescribed Burning Prescribed Grazing 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 toward the Low Plant Density Plant 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.
Conservation practices
Prescribed Burning Prescribed Grazing 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 the 1.2 Community to the Reference Plant Community. Recurrent drought has historically impacted the vegetation of this region. Changes in species composition and production, will vary depending upon the duration and severity of the drought cycle, and prior grazing management.
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 to 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 nutrient and the hydrologic cycles.
This is a very stable state, resistant to change due to the high tolerance of blue grama and buffalograss to grazing, the development of a shallow root system (root pan), and subsequent changes in hydrology and the nutrient cycling. The loss of other functional/structural groups such as cool-season bunch and rhizomatous grasses, forbs, and shrubs reduces the biodiversity productivity of this site.Dominant plant species
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big sagebrush (Artemisia tridentata), shrub
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prairie sagewort (Artemisia frigida), shrub
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blue grama (Bouteloua gracilis), grass
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threadleaf sedge (Carex filifolia), grass
Community 2.1
Blue Grama and Threadleaf SedgeThe mid-grasses and palatable forbs have been eliminated. The dominant species are blue grama, threadleaf sedge, and buffalograss. These species have developed into a sod-bound condition occurring in localized colonies exhibiting a mosaic appearance. Perennial threeawn species such as purple threeawn, have increased. Forbs such as scarlet globemallow, wild onion, death camas, slim-flower scurfpea, and skeletonplant remain. Forbs and shrubs that continue to increase are Cuman ragweed (western ragweed), hairy false goldenaster, fringed sagewort, and pricklypear. Plant diversity is very low.
Energy flow, water cycle, and mineral cycle 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 500 pounds per acre during an average year, but ranges from 350 pounds per acre in unfavorable years to 650 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is 700 pounds per acre during an average year, but ranges from 500 pounds per acre in unfavorable years to 900 pounds per acre in above-average years.
This plant community is extremely resistant to change. Many plant species are missing and a seed source is not readily available. Also, sod-forming grasses tend to maintain themselves due to their resistance to any further overgrazing.Dominant plant species
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big sagebrush (Artemisia tridentata), shrub
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prairie sagewort (Artemisia frigida), shrub
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blue grama (Bouteloua gracilis), grass
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threadleaf sedge (Carex filifolia), grass
Figure 14. Plant community growth curve (percent production by month). WY1104 , 12-14SP upland sites w/ warm. 12-14" Precipitation Zone, Southern Plains (SP) with warm-season (grass) species.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 20 35 30 5 5 0 0 0 State 3
Increased Bare GroundAn ecological threshold has been crossed. Erosion and loss of organic matter and carbon reserves are concerns. The hazard of soil erosion has increased due to the increase of bare ground. Runoff is typically high and infiltration is low. All ecological functions are impaired.
Dominant plant species
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big sagebrush (Artemisia tridentata), shrub
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prairie sagewort (Artemisia frigida), shrub
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blue grama (Bouteloua gracilis), grass
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Fendler threeawn (Aristida purpurea var. longiseta), grass
Community 3.1
Blue Grama and Purple ThreeawnThe plant composition is made of annuals with a few species of perennial forbs and grasses that are very tolerant to frequent and severe defoliation. The dominant grasses include blue grama, threadleaf sedge, and threeawn. Annuals such as sixweeks fescue, Russian thistle, burningbush and cheatgrass have increased or invaded. The dominant forbs include curlycup gumweed, green sagewort, and hairy false goldenaster. Broom snakeweed and pricklypear are increasing.
In the 12 to 14 inch PZ, the total annual production (air-dry weight) is 500 pounds per acre during an average year, but ranges from 350 pounds per acre in unfavorable years to 650 pounds per acre in above-average years.
In the 15 to 17 inch PZ, the total annual production (air-dry weight) is 700 pounds per acre during an average year, but ranges from 450 pounds per acre in unfavorable years to 950 pounds per acre in above-average years.Dominant plant species
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big sagebrush (Artemisia tridentata), shrub
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prairie sagewort (Artemisia frigida), shrub
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blue grama (Bouteloua gracilis), grass
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Fendler threeawn (Aristida purpurea var. longiseta), grass
Figure 15. Plant community growth curve (percent production by month). WY1104 , 12-14SP upland sites w/ warm. 12-14" Precipitation Zone, Southern Plains (SP) with warm-season (grass) species.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec J F M A M J J A S O N D 0 0 0 5 20 35 30 5 5 0 0 0 State 4
TilledThe Tilled state is the result of mechanical farming operations on the site. An ecological threshold has been crossed due to complete removal of vegetation and years of soil tillage. Physical, chemical, and biological soil properties have been dramatically altered. There is no restorative pathway known at this time.
Dominant plant species
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cheatgrass (Bromus tectorum), grass
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Fendler threeawn (Aristida purpurea var. longiseta), grass
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sand dropseed (Sporobolus cryptandrus), grass
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Russian thistle (Salsola), other herbaceous
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burningbush (Bassia scoparia), other herbaceous
Community 4.1
Russian Thistle, Burningbush, Cheatgrass, and Purple Threeawn, Go-Back LandGo-back land is created when the soil is tilled or farmed (sodbusted) and abandoned. All of the native plants are removeded, soil organic matter is reduced, soil structure is degraded, and a plowpan or compacted layer is formed. Residual synthetic chemicals often remain from past farming operations, and erosion processes may be active.
Go-back land evolves through several plant communities beginning with an early annual plant community, which initiates the revegetation process. Plants such as Russian thistle, burningbush, and other annuals begin to establish. These plants give some protection from erosion and start to build minor levels of soil organic matter. This early annual plant community lasts for two to several years. Threeawn, sand dropseed, and several other early perennials can dominate the plant community for five to eight years or more. Buffalograss establishes next and dominates for many years. Eventually western wheatgrass, blue grama, and other native plants become re-established. Where go-back land has eroded to parent material, the slow process of soil development and re-establishment of vegetation will start. This is a very slow process (100 years or more). A new ecological site may evolve depending upon the severity of soil erosion and parent material.Dominant plant species
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cheatgrass (Bromus tectorum), grass
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Fendler threeawn (Aristida purpurea var. longiseta), grass
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sand dropseed (Sporobolus cryptandrus), grass
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Russian thistle (Salsola), other herbaceous
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burningbush (Bassia scoparia), other herbaceous
Community 4.2
SeededThis plant community can vary considerably depending upon how eroded the soil was, the species seeded, how long ago the stand was established, and the management of the stand since establishment.
Transition T1A
State 1 to 2Frequent and severe defoliation without adequate recovery periods between grazing events and lack of fire will shift this plant community across an ecological threshold to the Sod-bound State. Biotic integrity and hydrologic function will be impaired as a result of this transition.
Key drivers
-
Livestock grazing or browsing
-
Fire frequency
Transition T1B
State 1 to 3Long-term heavy, defoliation without adequate recovery periods and lack of fire will shift this plant community 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 and carbon reserves are concerns. Non-native exotic plants are likely to invade.
Key drivers
-
Livestock grazing or browsing
-
Fire frequency
Transition T1C
State 1 to 4Mechanical tillage of this ecological site will cause an immediate transition across an ecological threshold to the Tilled State. This transition can occur from any plant community in this ecological site and is irreversible.
Key drivers
-
Mechanical soil disturbance
Transition T2A
State 2 to 3Long-term frequent and severe defoliation without adequate recovery periods and lack of fire will 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 and carbon reserves are constraints to recovery. Annual plants are likely to increase or invade as a result of this transition.
Key drivers
-
Livestock grazing or browsing
-
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 12 390–520 needle and thread HECO26 Hesperostipa comata 325–390 – green needlegrass NAVI4 Nassella viridula 65–130 – 2 12 260–325 western wheatgrass PASM Pascopyrum smithii 260–325 – thickspike wheatgrass ELLA3 Elymus lanceolatus 0–130 – 3 12 130–195 blue grama BOGR2 Bouteloua gracilis 130–195 – 4 12 65–130 little bluestem SCSC Schizachyrium scoparium 0–26 – 5 12 130–195 Graminoid (grass or grass-like) 2GRAM Graminoid (grass or grass-like) 0–65 – Indian ricegrass ACHY Achnatherum hymenoides 0–65 – sideoats grama BOCU Bouteloua curtipendula 0–65 – threadleaf sedge CAFI Carex filifolia 0–65 – prairie Junegrass KOMA Koeleria macrantha 0–65 – Sandberg bluegrass POSE Poa secunda 0–65 – threeawn ARIST Aristida 0–26 – 8 15 450–600 needle and thread HECO26 Hesperostipa comata 375–450 – green needlegrass NAVI4 Nassella viridula 75–150 – 9 15 300–375 western wheatgrass PASM Pascopyrum smithii 300–375 – thickspike wheatgrass ELLA3 Elymus lanceolatus 0–150 – 10 15 150–225 blue grama BOGR2 Bouteloua gracilis 150–225 – 11 15 75–150 little bluestem SCSC Schizachyrium scoparium 0–30 – 12 15 150–225 Graminoid (grass or grass-like) 2GRAM Graminoid (grass or grass-like) 0–75 – Indian ricegrass ACHY Achnatherum hymenoides 0–75 – sideoats grama BOCU Bouteloua curtipendula 0–75 – threadleaf sedge CAFI Carex filifolia 0–75 – prairie Junegrass KOMA Koeleria macrantha 0–75 – Sandberg bluegrass POSE Poa secunda 0–75 – threeawn ARIST Aristida 0–30 – Forb6 12 65–195 Forb, perennial 2FP Forb, perennial 0–65 – textile onion ALTE Allium textile 0–26 – Cuman ragweed AMPS Ambrosia psilostachya 0–26 – field sagewort ARCA12 Artemisia campestris 0–26 – white sagebrush ARLU Artemisia ludoviciana 0–26 – milkvetch ASTRA Astragalus 0–26 – white prairie clover DACA7 Dalea candida 0–26 – purple prairie clover DAPU5 Dalea purpurea 0–26 – larkspur DELPH Delphinium 0–26 – blacksamson echinacea ECAN2 Echinacea angustifolia 0–26 – sanddune wallflower ERCA14 Erysimum capitatum 0–26 – buckwheat ERIOG Eriogonum 0–26 – scarlet beeblossom GACO5 Gaura coccinea 0–26 – hairy false goldenaster HEVI4 Heterotheca villosa 0–26 – dotted blazing star LIPU Liatris punctata 0–26 – desertparsley LOMAT Lomatium 0–26 – Indian breadroot PEDIO2 Pediomelum 0–26 – beardtongue PENST Penstemon 0–26 – woolly plantain PLPA2 Plantago patagonica 0–26 – slimflower scurfpea PSTE5 Psoralidium tenuiflorum 0–26 – upright prairie coneflower RACO3 Ratibida columnifera 0–26 – scarlet globemallow SPCO Sphaeralcea coccinea 0–26 – American vetch VIAM Vicia americana 0–26 – meadow deathcamas ZIVE Zigadenus venenosus 0–26 – 13 15 75–225 Forb, perennial 2FP Forb, perennial 0–75 – textile onion ALTE Allium textile 0–30 – Cuman ragweed AMPS Ambrosia psilostachya 0–30 – field sagewort ARCA12 Artemisia campestris 0–30 – white sagebrush ARLU Artemisia ludoviciana 0–30 – milkvetch ASTRA Astragalus 0–30 – white prairie clover DACA7 Dalea candida 0–30 – purple prairie clover DAPU5 Dalea purpurea 0–30 – larkspur DELPH Delphinium 0–30 – blacksamson echinacea ECAN2 Echinacea angustifolia 0–30 – sanddune wallflower ERCA14 Erysimum capitatum 0–30 – buckwheat ERIOG Eriogonum 0–30 – scarlet beeblossom GACO5 Gaura coccinea 0–30 – hairy false goldenaster HEVI4 Heterotheca villosa 0–30 – dotted blazing star LIPU Liatris punctata 0–30 – desertparsley LOMAT Lomatium 0–30 – Indian breadroot PEDIO2 Pediomelum 0–30 – beardtongue PENST Penstemon 0–30 – woolly plantain PLPA2 Plantago patagonica 0–30 – slimflower scurfpea PSTE5 Psoralidium tenuiflorum 0–30 – upright prairie coneflower RACO3 Ratibida columnifera 0–30 – scarlet globemallow SPCO Sphaeralcea coccinea 0–30 – American vetch VIAM Vicia americana 0–30 – meadow deathcamas ZIVE Zigadenus venenosus 0–30 – Shrub/Vine7 12 65–130 Shrub (>.5m) 2SHRUB Shrub (>.5m) 0–65 – big sagebrush ARTR2 Artemisia tridentata 0–65 – winterfat KRLA2 Krascheninnikovia lanata 0–65 – plains pricklypear OPPO Opuntia polyacantha 0–26 – prairie rose ROAR3 Rosa arkansana 0–26 – fourwing saltbush ATCA2 Atriplex canescens 0–26 – yellow rabbitbrush CHVI8 Chrysothamnus viscidiflorus 0–26 – rubber rabbitbrush ERNA10 Ericameria nauseosa 0–26 – broom snakeweed GUSA2 Gutierrezia sarothrae 0–26 – silver sagebrush ARCA13 Artemisia cana 0–26 – prairie sagewort ARFR4 Artemisia frigida 0–26 – 14 15 75–150 Shrub (>.5m) 2SHRUB Shrub (>.5m) 0–75 – big sagebrush ARTR2 Artemisia tridentata 0–75 – winterfat KRLA2 Krascheninnikovia lanata 0–75 – plains pricklypear OPPO Opuntia polyacantha 0–30 – prairie rose ROAR3 Rosa arkansana 0–30 – fourwing saltbush ATCA2 Atriplex canescens 0–30 – rubber rabbitbrush ERNA10 Ericameria nauseosa 0–30 – broom snakeweed GUSA2 Gutierrezia sarothrae 0–30 – prairie sagewort ARFR4 Artemisia frigida 0–30 – yellow rabbitbrush CHVI8 Chrysothamnus viscidiflorus 0–8 – 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 (%) Table 10. Community 4.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 11. Community 4.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Animal community
Wildlife Interpretations
Reference Plant Community - Needle and Thread, Western Wheatgrass, Blue Grama:
The predominance of grasses plus high forb diversity in this community favors large grazers such as pronghorn and elk. Suitable thermal and escape cover for mule deer is limited due to low shrub cover. White and black- tailed jackrabbit, badger, and coyote commonly use this community. The Reference Plant Community also provides habitat for a wide array of smaller mammals, so diverse prey populations are available for raptors such as ferruginous and Swainson’s hawks. Birds such as western kingbird, western meadowlark, lark bunting, and grasshopper sparrow utilize this community for nesting and foraging.
1.2 Community - Threadleaf Sedge, Blue Grama, with Remnant Mid-grasses:
The reduction in taller grasses in this community results in decreased use by lark buntings and western meadowlarks. Use by long-billed curlew increases, provided there is standing water within one-quarter mile. Killdeer, horned larks, and McCown’s longspurs also make significant use of this community. Pronghorn may forage in this community.
1.3 Community - Low Plant Density, Increased Litter, Decadent Plants, and Standing Dead Canopy:
This community has low habitat value for most wildlife species. Horned larks may nest in this community.
2.1 Community - Blue Grama, Buffalograss, Threadleaf Sedge, Fringed sagewort, Pricklypear:
This community provides limited foraging for antelope and other grazers. Ground-nesting birds that favor sparse vegetation may use this community. Long-billed curlews use the 2.1 Community if standing water is present within one-quarter mile. Generally, this is not a target vegetative community for wildlife habitat management.
3.1 Community – Broom Snakeweed,
Annual Grasses and Forbs, Threadleaf Sedge, Cheatgrass, Invasives, and Bare Ground:
Sparse vegetation and greater amounts of bare ground provide suitable habitat for prairie dogs, horned larks, and McCown’s longspurs. However, a lack of complex vegetation structure and residual cover makes this community poor habitat in general for most ground-nesting birds and big game species.
4.1 Community:
The wildlife species found here are similar to the Increased Bare Ground Community.
Seeded Community (Adapted Seed Mixes):
Wildlife use of tilled and replanted fields is dependent upon the plant species used in the planted seed mix. Purpose of the seeding (i.e. reclamation, soil erosion control, livestock grazing, targeted wildlife species, etc.) affects the usability for wildlife. If wildlife use is a primary concern, then seed mixes must be formulated to meet species specific habitat requirements.
Grazing Interpretations
The following table is a guide to stocking rates for the plant communities described in the Loamy 12 to 17 inch PZ 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, 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 (AUM/acre) are listed below: Example:
Reference PC – (1300) (.36)
1,300 lbs. per acre X 25% percent Harvest Efficiency = 325 lbs. forage demand for one month. 325 lbs. per acre/912 demand per AUM =.36 AUMs/ac.
12-14" PZ
Reference PC - (1300) (.36)
1.2 PC - (900) (.25)
2.1 PC - (500) (.14)
1.3 PC (1200)(.33)
15-17" PZ
Reference PC – (1500) (.41)
1.2 PC – (1100) (0.30)
2.1 PC (700) (.19)
1.3 PC - (1400) (.38)
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
Water is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic group B and C, with localized areas in hydrologic group D. Infiltration ranges from moderately slow to moderate. Runoff potential for this site varies from low to moderate depending on soil hydrologic group and ground cover. In many cases, areas with greater than 75 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 (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 1-2 percent of the soil surface.Recreational uses
This site provides hunting, hiking, photography, bird watching, and other recreational 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).
The Annual Production Table and Species Composition List 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 NRCS NE and WY state offices in the future.
Existing NRI or 417 Inventory Data References updated.
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: NRI Number of Records: 37 Sample Period: 2006-2016 States: NE, WY, CO Counties: Banner, Garden, Kimball, Morrill, Scotts Bluff (NE); Goshen, Laramie, Platte (WY); Weld (CO) NRI: references to Natural Resource Inventory data 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)
References
-
Guyette, R.P., M.C. Stambaugh, D.C. Dey, and R. Muzika. 2012. Predicting Fire Frequency with Chemistry and Climate. Ecosystems 15:322–335.
-
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.
Other references
Other References
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National Range and Pasture Handbook. Available online. http://www.glti.nrcs.usda.gov/technical/publications/nrph.html.
Accessed 26 February, 2018.
U.S. Dept. of Agriculture, Natural Resources Conservation Service. National Soil Survey Handbook title 430-VI. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054242
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, NebraskaContributors
Kimberly Diller, Ecological Site Specialist, NRCS MLRA SSO, Pueblo CO
Andy Steinert, Project Leader, NRCS MLRA SSO, Fort Morgan, CO
Doug Whisenhunt, Ecological Site Specialist, NRCS MLRA SSO, Pueblo COApproval
Kirt Walstad, 12/10/2024
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, 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 11/04/2020 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 or terracettes are not expected on this site. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground is typically 5 to 10 percent, and patches less than 2 to 3 inches in diameter. Multi-year drought can cause bare ground to increase to 10 to 15 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 aggregate stability ratings should typically be 5 to 6, normally 6. Surface organic matter adheres to the soil surface. Soil surface peds will typically retain 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 5 to 12 inches (12.7-30.5 cm) thick. Soil colors range from grayish brown to dark grayish brown (values of 4 to 5) when dry and dark grayish brown or very dark grayish brown (values of 3 to 4) when moist. Soil surface structure is fine to medium 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 75 to 90 percent perennial grasses and grass-likes, 5 to 15 percent forbs, and 5 to 10 percent woody plants. The grass and grass-like component is made up of cool-season, bunch grasses (30-45%); cool-season, rhizomatous grasses (20-25%), warm-season short grasses (10-15%); warm-season mid-grasses (5-10%); and grass-likes (0-5%). -
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, C3 grasses – 390-630 #/ac (30-45%), 2 species minimum 15-17” PZ: Community 1.1 Native, C3, bunch grasses – 450-675 #/ac (30-45%), 2 species minimumSub-dominant:
12-14” PZ: Community 1.1 2. Native, C3, rhizomatous grasses – 260-325 (20-25%), 1 species minimum 3. Native, C4, short grasses – 130-195 #/ac (10-15%), 1 species minimum 4. Native, Perennial and Annual Forbs – 65-195 #/ac (5-15%), 3 species minimum 15-17” PZ: Community 1.1 2. Native, C3, rhizomatous grasses – 300-375 (20-25%), 1 species minimum 3. Native, C4, short grasses – 150-225 #/ac (10-15%), 1 species minimum 4. Native, Perennial and Annual Forbs – 75-225 #/ac (5-15%), 3 species minimumOther:
12-14” PZ: Community 1.1 5. Minor: Native, C4, mid-grasses – 65-130 #/ac (5-10%) 6. Minor: Shrubs, Vines, Cacti – 65-130 #/ac: (5-10%) 7. Minor: Grass-likes – 0-65 #/ac (0-5%) 15-17” PZ: Community 1.1 5. Minor: Native, C4, mid-grasses – 75-150 #/ac (5-10%) 6. Minor: Shrubs, Vines, Cacti – 75-150 #/ac: (5-10%) 7. Minor: Grass-likes – 0-75 #/ac (0-5%)Additional:
12-14” PZ: Community 1.1 12a. Relative Dominance: Community 1.1: Native, C3 bunch grasses > Native, C3, rhizomatous grasses > C4, short grasses > Native, Perennial and Annual Forbs > Native, C4, mid-grasses = Shrubs, cacti, vines > Grass-likes. 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: 7 15-17” PZ: Community 1.1 12a. Relative Dominance: Community 1.1: Native, C3 bunch grasses > Native, C3, rhizomatous grasses > C4, short grasses = Native, Perennial and Annual Forbs > Native, C4, mid-grasses = Shrubs, cacti, vines > Grass-likes. 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: 7 -
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. The exception is the potential for up to 10 percent mortality in the 15-17” PZ and up to 15 percent mortality in the 12-14” PZ of mid and short, warm-season bunch grasses during multi-year drought cycles. -
Average percent litter cover (%) and depth ( in):
Plant litter cover is evenly distributed throughout the site and is expected to be 50 to 70 percent. Litter depth is expected to be 0.25 to 0.50 inches (0.65-1.30 cm). -
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 750 to 1750 pounds per acres (air dry basis). Average annual production is 1,300 pounds per acre under normal precipitation and weather conditions. In the 15-17” Precipitation Zone, annual production ranges from 1000 to 2000 pounds per acre (air dry basis). Average annual production is 1,500 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:
Annual bromes, fringed sagewort, green sagewort, hairy goldaster (especially in the 12-14” PZ), prickly pear 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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