Natural Resources
Conservation Service
Ecological site R061XN024SD
Shallow Loamy-North (18-22" PZ)
Accessed: 05/01/2024
General information
Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.
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.
Classification relationships
Level IV Ecoregions of the Conterminous United States: 17a – Black Hills Foothills.
Associated sites
| R061XN010SD |
Loamy-North (18-22" PZ) |
|---|---|
| R061XN012SD |
Thin Upland-North (18-22" PZ) |
| R061XY029SD |
Stony Hills |
Similar sites
| R061XY029SD |
Stony Hills (R061XN029SD) – Stony Hills [more big bluestem and ponderosa pine; higher production] |
|---|---|
| R061XN012SD |
Thin Upland-North (18-22" PZ) (R061XN012SD) – Thin Upland [more little bluestem and sideoats grama; less big bluestem] |
Table 1. Dominant plant species
| Tree |
Not specified |
|---|---|
| Shrub |
Not specified |
| Herbaceous |
(1) Schizachyrium scoparium |
Physiographic features
This site occurs on gently to steeply sloping uplands.
Table 2. Representative physiographic features
| Landforms |
(1)
Ridge
(2) Hogback (3) Hill |
|---|---|
| Flooding frequency | None |
| Ponding frequency | None |
| Elevation | 2,900 – 4,000 ft |
| Slope | 6 – 45% |
| Aspect | Aspect is not a significant factor |
Climatic features
The climate in this MLRA is typical of the drier portions of the Northern Great Plains where sagebrush steppes to the west yield to grassland steppes to the east. Annual precipitation ranges from 18 to 21 inches per year, with most occurring during the growing season. Temperatures show a wide range between summer and winter and between daily maximums and minimums, due to the high elevation and dry air, which permits rapid incoming and outgoing radiation. Cold air outbreaks from Canada in winter move rapidly from northwest to southeast and account for extreme minimum temperatures. Chinook winds may occur in winter and bring rapid rises in temperature. Extreme storms may occur during the winter, but most severely affect ranch operations during late winter and spring.
The average annual temperature is about 46° F. January is the coldest month with average temperatures ranging from about 20° F (Sundance, Wyoming (WY)) to about 26° F (Fort Meade, South Dakota (SD)). July is the warmest month with temperatures averaging from about 69° F (Sundance, WY) to about 72° F (Fort Meade, SD). The range of average monthly temperatures between the coldest and warmest months is about 48° F. Hourly winds are estimated to average about 11 miles per hour annually, ranging from about 13 miles per hour during the spring to about 10 miles per hour during the summer. Daytime winds are generally stronger than nighttime and occasional storms may bring brief periods of high winds with gusts to more than 50 miles per hour.
Growth of cool season plants begins in early to mid March, slowing or ceasing in late June. Warm season plants begin growth about mid May and continue to early or mid September. Green up of cool season plants may occur in September and October when adequate soil moisture is present.
Table 3. Representative climatic features
| Frost-free period (average) | 140 days |
|---|---|
| Freeze-free period (average) | 167 days |
| Precipitation total (average) | 21 in |
Figure 2. Monthly precipitation range
Figure 3. Monthly average minimum and maximum temperature
Influencing water features
No riparian areas or wetland features are directly associated with this site.
Soil features
The common features of soils in this site are fine sandy loam to silty clay loam textured sub-surface soils, with slopes ranging from about 6 to 45 percent. The soils in this site are well drained and formed in residuum. The fine sandy loam to silt loam surface layer is 3 to 6 inches thick. The soils have a moderately rapid to moderately slow infiltration rate. This site typically should show slight to no evidence of rills, wind scoured areas or pedestalled plants. If present, water flow paths are broken, irregular in appearance or discontinuous. The soil surface is stable and intact. There is a restrictive layer of bedrock (typically sandstone, siltstone, or limestone) at about 10 to 20 inches in depth which impedes water movement and root penetration.
These soils are mainly susceptible to water erosion. The hazard of water erosion increases on slopes greater than about 10 percent. Loss of 50 percent or more of the surface layer of the soils on this site can result in a shift in species composition and/or production.
Access Web Soil Survey (http://websoilsurvey.nrcs.usda.gov/app/) for specific local soils information.
Table 4. Representative soil features
| Surface texture |
(1) Loam (2) Silt loam (3) Fine sandy loam |
|---|---|
| Family particle size |
(1) Loamy |
| Drainage class | Well drained |
| Permeability class | Moderately slow to moderately rapid |
| Soil depth | 10 – 20 in |
| Surface fragment cover <=3" | 15% |
| Surface fragment cover >3" | 7% |
| Available water capacity (0-40in) |
1 – 3 in |
| Calcium carbonate equivalent (0-40in) |
20% |
| Electrical conductivity (0-40in) |
4 mmhos/cm |
| Sodium adsorption ratio (0-40in) |
4 |
| Soil reaction (1:1 water) (0-40in) |
6.1 – 8.4 |
| Subsurface fragment volume <=3" (Depth not specified) |
50% |
| Subsurface fragment volume >3" (Depth not specified) |
30% |
Ecological dynamics
This site developed under Northern Great Plains climatic conditions, light to severe grazing by bison and other large herbivores, sporadic natural or man-caused wildfire (often of light intensities), and other biotic and abiotic factors that typically influence soil/site development. Changes will occur in the plant communities due to short-term weather variations, impacts of native and/or exotic plant and animal species, and management actions. While the following plant community descriptions describe more typical transitions that will occur, severe disturbances, such as periods of well-below average precipitation, can cause significant shifts in plant communities and/or species composition.
Heavy continuous grazing (e.g., every spring and/or every summer at moderate to heavy stocking levels) without adequate recovery periods following grazing events causes departure from the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (1.1). Bluegrass will increase and eventually develop into a sod. Western wheatgrass will increase initially and then begin to decrease. Needleandthread, green needlegrass, big bluestem, sideoats grama, Indiangrass and little bluestem will decrease in frequency and production. Excessive defoliation can cause threeawn and annuals to increase and dominate the site. A few mature trees comprised of ponderosa pine and Rocky Mountain juniper occupy this site. With extended periods of a lack of fire, trees will begin to encroach into the herbaceous community and may eventually dominate the site.
Interpretations are primarily based on the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (1.1). It has been determined by study of rangeland relic areas, areas protected from excessive disturbance, and areas under long-term rotational grazing regimes. Trends in plant community dynamics ranging from heavily grazed to lightly grazed areas, seasonal use pastures, and historical accounts also have been used. Plant community phases, states, transitional pathways, and thresholds have been determined through similar studies and experience.
The following is a diagram that illustrates the common plant community phases that can occur on the site and the transition pathways between communities. These are the most common plant community phases based on current knowledge and experience, and changes may be made as more data is collected. Narratives following the diagram contain more detail pertaining to the ecological processes.
State and transition model
More interactive model formats are also available.
View Interactive Models
More interactive model formats are also available.
View Interactive Models
Click on state and transition labels to scroll to the respective text
Ecosystem states
State 2 submodel, plant communities
State 3 submodel, plant communities
State 1
Reference
This state represents the natural range of variability that dominates the dynamics of this ecological site. This state is dominated by warm-season grasses, with cool-season grasses being subdominant. In pre-European times, the primary disturbance mechanisms for this site in the reference condition included occasional fire and grazing by large ungulates. Timing of fires and grazing coupled with weather events dictated the dynamics that occurred within the natural range of variability. Taller cool- and warm-season grasses would have declined and a corresponding increase in short statured grass and grass-like species would have occurred. Today, a similar state can be found on areas that are properly managed with grazing and/or prescribed burning, and sometimes on areas receiving occasional short periods of rest.
Community 1.1
Little Bluestem/Sideoats Grama/Big Bluestem
Interpretations are based primarily on the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (this is also considered to be climax). The potential vegetation is about 75 percent grasses or grass-like plants, 10 percent forbs, 10 percent shrubs, and up to 5 percent trees. The community is dominated by warm-season grasses, with cool-season grasses being subdominant. The major grasses include little bluestem, sideoats grama, big bluestem, and western wheatgrass. Other grasses include plains muhly, slender wheatgrass, prairie dropseed, Indiangrass, prairie sandreed, blue grama, and a variety of other grass and grass-like species. This plant community is resilient and well adapted to the Northern Great Plains climatic conditions. The diversity in plant species allows for high drought tolerance. This is a sustainable plant community in regards to site/soil stability, watershed function, and biologic integrity.
Figure 4. Annual production by plant type (representative values) or group (midpoint values)
Table 5. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 1500 | 1815 | 2180 |
| Shrub/Vine | 100 | 165 | 250 |
| Forb | 100 | 165 | 250 |
| Tree | 0 | 55 | 120 |
| Total | 1700 | 2200 | 2800 |
Figure 5. Plant community growth curve (percent production by month). SD6104, Black Hills Foot Slopes, warm-season dominant, cool-season sub-dominant. Warm-season dominant, cool-season sub-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 7 | 17 | 25 | 25 | 15 | 7 | 1 |
Community 1.2
Little Bluestem/Western Wheatgrass/Needleandthread
This plant community developed under heavy continuous grazing or from over utilization during extended drought periods. This community can also develop where this site occurs near water sources. The potential plant community is made up of approximately 75 percent grasses and grass-like species, 10 percent forbs, 10 percent shrubs, and up to about 6 percent trees. Dominant grasses include little bluestem, western wheatgrass, needleandthread, sideoats grama, and blue grama. Grasses and grass-likes species of secondary importance include threadleaf sedge, big bluestem, slender wheatgrass, plains muhly, prairie sandreed, hairy grama, and a variety of other grasses. Forbs commonly found in this plant community include cudweed sagewort, goldenrod, white prairie aster, scurfpea, and western ragweed. When compared to the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (1.1), blue grama, sedge, and western wheatgrass have increased. Tall warm-season grasses have decreased, and production has also been reduced. Needleandthread will persist in this phase. This plant community is moderately resistant to change. This is due in part to the shallow rooted nature of the shortgrass species which decreases infiltration especially to the deeper rooted tall and mid grass species. The herbaceous species present are well adapted to grazing; however, species composition can be altered through continued overgrazing. If the herbaceous component is intact, it tends to be resilient if the disturbance is not long-term.
Figure 6. Annual production by plant type (representative values) or group (midpoint values)
Table 6. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 1230 | 1476 | 1680 |
| Shrub/Vine | 85 | 135 | 200 |
| Forb | 85 | 135 | 200 |
| Tree | 0 | 54 | 120 |
| Total | 1400 | 1800 | 2200 |
Figure 7. Plant community growth curve (percent production by month). SD6103, Black Hills Foot Slopes, cool-season/warm-season co-dominant. Cool-season, warm-season co-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 10 | 20 | 28 | 21 | 10 | 5 | 3 |
Community 1.3
Western Wheatgrass/Needleandthread/Sedge/Blue Grama
This plant community developed under heavy continuous grazing or from over utilization during extended drought periods. This community can also develop where this site occurs near water sources. The potential plant community is made up of approximately 65 percent grasses and grass-like species, 15 percent forbs, 15 percent shrubs, and up to about 7 percent trees. Dominant grass and grass-like species include western wheatgrass, needleandthread, blue grama, and threadleaf sedge. Grasses of secondary importance include little bluestem, hairy grama, big bluestem, slender wheatgrass, plains muhly, prairie sandreed, hairy grama, and a variety of other grasses. Forbs commonly found in this plant community include cudweed sagewort, goldenrod, white prairie aster, scurfpea, and western ragweed. When compared to the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (1.1), blue grama, sedge, and western wheatgrass have increased. Tall and mid warm-season grasses have decreased, and production has also been reduced. This plant community is moderately resistant to change. This is due in part to the shallow rooted nature of the shortgrass species which decreases infiltration especially to the deeper rooted tall and mid grass species. The herbaceous species present are well adapted to grazing; however, species composition can be altered through continued overgrazing. If the herbaceous component is intact, it tends to be resilient if the disturbance is not long-term. This plant community phase is reaching a critical point where continued overgrazing will likely shift this community over a threshold leading to a short grass and grass-like dominated state. The shorter, more grazing tolerant species tend to self-perpetuate as the shallow, dense rooting structure takes advantage of rainfall and reduces deeper infiltration to the taller species.
Figure 8. Annual production by plant type (representative values) or group (midpoint values)
Table 7. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 960 | 1148 | 1275 |
| Shrub/Vine | 70 | 150 | 255 |
| Forb | 70 | 150 | 255 |
| Tree | 0 | 52 | 115 |
| Total | 1100 | 1500 | 1900 |
Figure 9. Plant community growth curve (percent production by month). SD6103, Black Hills Foot Slopes, cool-season/warm-season co-dominant. Cool-season, warm-season co-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 10 | 20 | 28 | 21 | 10 | 5 | 3 |
Pathway 1.1a
Community 1.1 to 1.2
Heavy continuous grazing (stocking levels well above carrying capacity for extended portions of the growing season) or a combination of disturbances for extended periods of time will lead to the 1.2 Little Bluestem/Western Wheatgrass/Needleandthread Plant Community Phase.
Pathway 1.2b
Community 1.2 to 1.1
Prescribed grazing (alternating season of use and providing adequate recovery periods) or periodic light to moderate grazing possibly including periodic rest will convert this plant community to the 1.1 Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase.
Conservation practices
| Prescribed Grazing |
|---|
Pathway 1.2a
Community 1.2 to 1.3
Heavy continuous grazing (stocking levels well above carrying capacity for extended portions of the growing season) or a combination of disturbances for extended periods of time will lead to the 1.3 Western Wheatgrass/Needleandthread/Sedge/Blue Grama Plant Community Phase.
Pathway 1.3a
Community 1.3 to 1.2
Prescribed grazing (alternating season of use and providing adequate recovery periods) or periodic light to moderate grazing possibly including periodic rest will convert this plant community to the 1.2 Little Bluestem/Western Wheatgrass/Needleandthread Plant Community Phase.
Conservation practices
| Prescribed Grazing |
|---|
State 2
Shortgrass Sod
This state is a result of overgrazing (individual plants of selected species being repeatedly grazed due to continuous grazing systems which allow for long paddock occupation periods). This type of grazing causes reduced vigor of the selected species (i.e., typically the most desired by grazing ungulates). As the photosynthetic area of these species is repeatedly removed, carbohydrate production needed for root respiration is inadequate, and the root systems of these species begin to falter. The shorter, more grazing tolerant species are given the advantage, and will dominate the site. In the early stages of this State, mid and tall grass remnants may be present in sufficient quantities to allow for recovery to the Reference State. Over time, this recovery will become less likely due to higher runoff and reduced infiltration.
Community 2.1
Sedge/Blue Grama/Fringed Sagewort
This plant community evolved under heavy continuous grazing, heavy continuous season-long grazing or from over utilization during extended drought periods. The potential plant community is made up of approximately 65 percent grasses and grass-like species, 10 percent forbs, 15 percent shrubs, and up to about 10 percent trees. Dominant grass and grass-like species include threadleaf sedge, blue grama, and threeawn. Grasses of secondary importance include western wheatgrass, needleandthread, little bluestem, sideoats grama, hairy grama, and prairie junegrass. Cheatgrass may also invade and become quite prevalent. Forbs commonly found in this plant community include cudweed sagewort, goldenrod, spiny phlox, and western ragweed. When compared to the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (1.1), short statured species are dominant on this plant community. Tall and mid grasses have decreased significantly. This vegetation state is very resistant to change due to the increase in the root mat near the surface of the soil which further reduces infiltration. The herbaceous species present are well adapted to grazing. This plant community is less productive than other plant community phases. The thick sod prevents other species from getting established. Lack of litter and reduced plant vigor causes higher soil temperatures, poor water infiltration rates, and high evapotranspiration which give the short statured species a competitive advantage. Soil erosion will be minimal due to the sod forming habit of dominant species in this phase.
Figure 10. Annual production by plant type (representative values) or group (midpoint values)
Table 8. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 700 | 853 | 1075 |
| Shrub/Vine | 50 | 110 | 185 |
| Tree | 0 | 54 | 120 |
| Forb | 50 | 83 | 120 |
| Total | 800 | 1100 | 1500 |
Figure 11. Plant community growth curve (percent production by month). SD6104, Black Hills Foot Slopes, warm-season dominant, cool-season sub-dominant. Warm-season dominant, cool-season sub-dominant.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 3 | 7 | 17 | 25 | 25 | 15 | 7 | 1 |
State 3
Conifer/Herbaceous
This state consists of areas where tree canopy increases to a level that impedes the reproductive capability of the major native perennial grass species. The increase in tree canopy is a result of a disruption of the natural historic fire regime that kept the trees at an immature stage. This State is reached when mature tree canopy reaches about 25% or more. Tree canopy typically is dominated by ponderosa pine, but bur oak, eastern redcedar, and Rocky Mountain juniper may also be present in varying amounts.
Community 3.1
Little Bluestem/Sideoats Grama/Bur Oak/Ponderosa Pine
This plant community develops where trees from adjacent sites encroach, or trees naturally occurring on the site increase and begin to shade out the herbaceous component. Ponderosa pine is the most common species to occupy the site, but encroachment also occurs by eastern redcedar, Rocky Mountain juniper, and/or occasionally deciduous trees such as bur oak. These species expand on this site due to suppression of fire. The tree canopy is 25 percent or greater. The potential plant community is made up of approximately 45 percent grasses and grass-like species, 10 percent forbs, 10 percent shrubs, and 35 percent trees. Dominant grass and grass-like species include little bluestem, sideoats grama, western wheatgrass, green needlegrass, and threadleaf sedge. As the canopy increases, warm-season grasses tend to decrease as the cool-season grasses initially increase. Forbs commonly found in this community include cudweed sagewort, goldenrod, and western yarrow. Non-native species such as cheatgrass and bluegrass will tend to invade. Compared to the Little Bluestem/Sideoats Grama/Big Bluestem Plant Community Phase (1.1), tree canopy increases significantly. The grass component decreases dramatically with increased shading and the buildup of duff. Annual herbaceous production also decreases significantly. While the tree canopy provides excellent protection from the weather for both livestock and wildlife, it is not capable of supporting large numbers of wildlife and livestock due to decreased production. A significant reduction of tree canopy can be accomplished through timber harvest or crown fire. The vegetation in the understory is capable of enduring fire; however, very hot crown fires will have a detrimental effect to the plant community. The total annual production of the understory can range from nearly non-existent under a closed canopy to about 500 pounds per acre (air-dry weight) under a medium canopy.
Figure 12. Plant community growth curve (percent production by month). SD6111, Black Hills Foot Slopes, heavy conifer canopy. Mature ponderosa pine/juniper overstory.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 1 | 3 | 7 | 11 | 24 | 27 | 12 | 5 | 4 | 3 | 2 | 1 |
Transition T1a
State 1 to 2
Heavy continuous grazing (stocking levels well above carrying capacity for extended portions of the growing season) or a combination of disturbances for extended periods of time will lead this plant community over a threshold and result in the 2.1 Sedge/Blue Grama/Fringed Sagewort Plant Community Phase within the Shortgrass Sod State (State 2).
Transition T1b
State 1 to 3
Encroachment and/or an increase in canopy cover of native coniferous tree species will lead this plant community phase over a threshold to the Conifer/Herbaceous State (State 3). This threshold will be crossed when tree canopy reaches about 25% or more of mature trees.
Restoration pathway R2
State 2 to 1
Long-term prescribed grazing (moderate stocking levels coupled with adequate recovery periods, or other grazing systems such as high-density, low-frequency intended to treat specific species dominance, or periodic light to moderate stocking levels possibly including periodic rest) may lead this plant community phase over a threshold to the Reference State (State 1). This will likely take a long period of time, possibly up to 10 years or more, and recovery may not be attainable. Under certain circumstances, the harsh conditions created by the shortgrass sod can lead to the elimination of invasive grass species such as Kentucky bluegrass.
Conservation practices
| Prescribed Grazing |
|---|
Restoration pathway R3
State 3 to 1
Prescribed burning in conjunction with long-term prescribed grazing may lead this plant community across a threshold back to the Reference State (State 1). This would have to take place before the trees reach maturity and are still susceptible to fire, and reproductive propagules of the perennial grasses are still present. After trees reach maturity, a crown fire or timber harvest would be needed to move this plant community over the threshold back to the Reference State (State 1).
Conservation practices
| Prescribed Burning | |
|---|---|
| Prescribed Grazing |
Additional community tables
Table 9. Community 1.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Mid Warm-Season Grasses | 220–770 | ||||
| little bluestem | SCSC | Schizachyrium scoparium | 110–660 | – | ||
| sideoats grama | BOCU | Bouteloua curtipendula | 44–330 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 22–220 | – | ||
| prairie dropseed | SPHE | Sporobolus heterolepis | 0–176 | – | ||
| 2 | Tall Warm-Season Grasses | 110–440 | ||||
| big bluestem | ANGE | Andropogon gerardii | 110–440 | – | ||
| prairie sandreed | CALO | Calamovilfa longifolia | 22–176 | – | ||
| Indiangrass | SONU2 | Sorghastrum nutans | 22–176 | – | ||
| switchgrass | PAVI2 | Panicum virgatum | 0–110 | – | ||
| 3 | Cool-Season Bunchgrasses | 110–330 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 44–220 | – | ||
| sleepygrass | ACRO7 | Achnatherum robustum | 22–110 | – | ||
| green needlegrass | NAVI4 | Nassella viridula | 22–110 | – | ||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 0–110 | – | ||
| spike fescue | LEKI2 | Leucopoa kingii | 0–66 | – | ||
| 4 | Wheatgrass | 110–330 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 110–330 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–220 | – | ||
| 5 | Short Warm-Season Grasses | 44–176 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 22–154 | – | ||
| hairy grama | BOHI2 | Bouteloua hirsuta | 0–66 | – | ||
| threeawn | ARIST | Aristida | 0–44 | – | ||
| 6 | Other Native Grasses | 22–154 | ||||
| prairie Junegrass | KOMA | Koeleria macrantha | 22–110 | – | ||
| Graminoid (grass or grass-like) | 2GRAM | Graminoid (grass or grass-like) | 0–110 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–66 | – | ||
| onespike danthonia | DAUN | Danthonia unispicata | 0–44 | – | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–44 | – | ||
| 7 | Grass-likes | 22–110 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 22–110 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–66 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 110–220 | ||||
| Forb, native | 2FN | Forb, native | 22–66 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 22–44 | – | ||
| prairie clover | DALEA | Dalea | 22–44 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 22–44 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 22–44 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 22–44 | – | ||
| beardtongue | PENST | Penstemon | 22–44 | – | ||
| scurfpea | PSORA2 | Psoralidium | 22–44 | – | ||
| goldenrod | SOLID | Solidago | 22–44 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 22–44 | – | ||
| American vetch | VIAM | Vicia americana | 22–44 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–22 | – | ||
| stemless four-nerve daisy | TEACA2 | Tetraneuris acaulis var. acaulis | 0–22 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 0–22 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–22 | – | ||
| hairy false goldenaster | HEVI4 | Heterotheca villosa | 0–22 | – | ||
| bladderpod | LESQU | Lesquerella | 0–22 | – | ||
| buckwheat | ERIOG | Eriogonum | 0–22 | – | ||
| downy Indian paintbrush | CAPU11 | Castilleja purpurea | 0–22 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 0–22 | – | ||
| textile onion | ALTE | Allium textile | 0–22 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 0–22 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 110–220 | ||||
| leadplant | AMCA6 | Amorpha canescens | 22–88 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 22–44 | – | ||
| rose | ROSA5 | Rosa | 22–44 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 22–44 | – | ||
| soapweed yucca | YUGL | Yucca glauca | 0–22 | – | ||
| pricklypear | OPUNT | Opuntia | 0–22 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–22 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 0–22 | – | ||
|
Tree
|
||||||
| 10 | Trees | 0–110 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–110 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–110 | – | ||
| Tree | 2TREE | Tree | 0–66 | – | ||
| juniper | JUNIP | Juniperus | 0–66 | – | ||
Table 10. Community 1.2 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Mid Warm-Season Grasses | 180–450 | ||||
| little bluestem | SCSC | Schizachyrium scoparium | 90–450 | – | ||
| sideoats grama | BOCU | Bouteloua curtipendula | 18–180 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–90 | – | ||
| prairie dropseed | SPHE | Sporobolus heterolepis | 0–54 | – | ||
| 2 | Tall Warm-Season Grasses | 36–180 | ||||
| big bluestem | ANGE | Andropogon gerardii | 18–144 | – | ||
| prairie sandreed | CALO | Calamovilfa longifolia | 0–90 | – | ||
| Indiangrass | SONU2 | Sorghastrum nutans | 0–54 | – | ||
| switchgrass | PAVI2 | Panicum virgatum | 0–18 | – | ||
| 3 | Cool-Season Bunchgrasses | 90–270 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 90–270 | – | ||
| green needlegrass | NAVI4 | Nassella viridula | 0–54 | – | ||
| sleepygrass | ACRO7 | Achnatherum robustum | 0–36 | – | ||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 0–18 | – | ||
| 4 | Wheatgrass | 90–360 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 90–360 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–126 | – | ||
| 5 | Short Warm-Season Grasses | 36–180 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 36–180 | – | ||
| hairy grama | BOHI2 | Bouteloua hirsuta | 0–90 | – | ||
| threeawn | ARIST | Aristida | 0–54 | – | ||
| 6 | Other Native Grasses | 18–90 | ||||
| Graminoid (grass or grass-like) | 2GRAM | Graminoid (grass or grass-like) | 0–72 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 18–72 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–36 | – | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–36 | – | ||
| onespike danthonia | DAUN | Danthonia unispicata | 0–18 | – | ||
| 7 | Grass-likes | 18–144 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 18–144 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–90 | – | ||
| 8 | Non-Native Grasses | 18–126 | ||||
| cheatgrass | BRTE | Bromus tectorum | 18–90 | – | ||
| bluegrass | POA | Poa | 0–90 | – | ||
|
Forb
|
||||||
| 9 | Forbs | 90–180 | ||||
| Forb, native | 2FN | Forb, native | 0–54 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 18–54 | – | ||
| scurfpea | PSORA2 | Psoralidium | 18–54 | – | ||
| goldenrod | SOLID | Solidago | 18–54 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 18–36 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 0–36 | – | ||
| Forb, introduced | 2FI | Forb, introduced | 18–36 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 18–36 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 0–36 | – | ||
| American vetch | VIAM | Vicia americana | 0–36 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–18 | – | ||
| buckwheat | ERIOG | Eriogonum | 0–18 | – | ||
| scarlet beeblossom | GACO5 | Gaura coccinea | 0–18 | – | ||
| hairy false goldenaster | HEVI4 | Heterotheca villosa | 0–18 | – | ||
| bladderpod | LESQU | Lesquerella | 0–18 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 0–18 | – | ||
| textile onion | ALTE | Allium textile | 0–18 | – | ||
| beardtongue | PENST | Penstemon | 0–18 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–18 | – | ||
| downy Indian paintbrush | CAPU11 | Castilleja purpurea | 0–18 | – | ||
| prairie clover | DALEA | Dalea | 0–18 | – | ||
| stemless four-nerve daisy | TEACA2 | Tetraneuris acaulis var. acaulis | 0–18 | – | ||
| upright prairie coneflower | RACO3 | Ratibida columnifera | 0–18 | – | ||
|
Shrub/Vine
|
||||||
| 10 | Shrubs | 90–180 | ||||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 18–54 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 18–54 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 18–54 | – | ||
| soapweed yucca | YUGL | Yucca glauca | 0–36 | – | ||
| pricklypear | OPUNT | Opuntia | 0–36 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–36 | – | ||
| rose | ROSA5 | Rosa | 18–36 | – | ||
| leadplant | AMCA6 | Amorpha canescens | 0–36 | – | ||
|
Tree
|
||||||
| 11 | Trees | 0–108 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–108 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–108 | – | ||
| Tree | 2TREE | Tree | 0–54 | – | ||
| juniper | JUNIP | Juniperus | 0–54 | – | ||
Table 11. Community 1.3 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Mid Warm-Season Grasses | 30–180 | ||||
| little bluestem | SCSC | Schizachyrium scoparium | 0–150 | – | ||
| sideoats grama | BOCU | Bouteloua curtipendula | 0–75 | – | ||
| plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–15 | – | ||
| 2 | Tall Warm-Season Grasses | 0–45 | ||||
| big bluestem | ANGE | Andropogon gerardii | 0–45 | – | ||
| 3 | Cool-Season Bunchgrasses | 15–120 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 15–120 | – | ||
| green needlegrass | NAVI4 | Nassella viridula | 0–15 | – | ||
| 4 | Wheatgrass | 75–300 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 75–300 | – | ||
| slender wheatgrass | ELTR7 | Elymus trachycaulus | 0–45 | – | ||
| 5 | Short Warm-Season Grasses | 75–225 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 75–255 | – | ||
| hairy grama | BOHI2 | Bouteloua hirsuta | 0–120 | – | ||
| threeawn | ARIST | Aristida | 15–75 | – | ||
| 6 | Other Native Grasses | 15–75 | ||||
| Graminoid (grass or grass-like) | 2GRAM | Graminoid (grass or grass-like) | 0–45 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 15–45 | – | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–30 | – | ||
| Cusick's bluegrass | POCU3 | Poa cusickii | 0–15 | – | ||
| 7 | Grass-likes | 75–225 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 75–225 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–75 | – | ||
| 8 | Non-Native Grasses | 15–150 | ||||
| cheatgrass | BRTE | Bromus tectorum | 15–150 | – | ||
| bluegrass | POA | Poa | 0–75 | – | ||
|
Forb
|
||||||
| 9 | Forbs | 75–225 | ||||
| Forb, introduced | 2FI | Forb, introduced | 15–60 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 15–60 | – | ||
| Forb, native | 2FN | Forb, native | 0–45 | – | ||
| scurfpea | PSORA2 | Psoralidium | 15–45 | – | ||
| goldenrod | SOLID | Solidago | 15–45 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 15–45 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 15–30 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 0–30 | – | ||
| textile onion | ALTE | Allium textile | 0–15 | – | ||
| prairie clover | DALEA | Dalea | 0–15 | – | ||
| blacksamson echinacea | ECAN2 | Echinacea angustifolia | 0–15 | – | ||
| buckwheat | ERIOG | Eriogonum | 0–15 | – | ||
| bladderpod | LESQU | Lesquerella | 0–15 | – | ||
| dotted blazing star | LIPU | Liatris punctata | 0–15 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–15 | – | ||
| American vetch | VIAM | Vicia americana | 0–15 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–15 | – | ||
|
Shrub/Vine
|
||||||
| 10 | Shrubs | 75–225 | ||||
| prairie sagewort | ARFR4 | Artemisia frigida | 15–120 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 15–75 | – | ||
| soapweed yucca | YUGL | Yucca glauca | 15–75 | – | ||
| pricklypear | OPUNT | Opuntia | 0–60 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 15–60 | – | ||
| rose | ROSA5 | Rosa | 15–45 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–30 | – | ||
|
Tree
|
||||||
| 11 | Trees | 0–105 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–105 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–105 | – | ||
| Tree | 2TREE | Tree | 0–60 | – | ||
| juniper | JUNIP | Juniperus | 0–60 | – | ||
Table 12. Community 2.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | Mid Warm-Season Grasses | 0–55 | ||||
| sideoats grama | BOCU | Bouteloua curtipendula | 0–33 | – | ||
| little bluestem | SCSC | Schizachyrium scoparium | 0–33 | – | ||
| 2 | Cool-Season Bunchgrasses | 0–55 | ||||
| needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 0–55 | – | ||
| 3 | Wheatgrass | 0–110 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 0–110 | – | ||
| 4 | Short Warm-Season Grasses | 165–330 | ||||
| blue grama | BOGR2 | Bouteloua gracilis | 110–275 | – | ||
| threeawn | ARIST | Aristida | 22–110 | – | ||
| hairy grama | BOHI2 | Bouteloua hirsuta | 0–88 | – | ||
| 5 | Other Native Grasses | 11–55 | ||||
| prairie Junegrass | KOMA | Koeleria macrantha | 11–33 | – | ||
| Graminoid (grass or grass-like) | 2GRAM | Graminoid (grass or grass-like) | 0–22 | – | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–22 | – | ||
| 6 | Grass-likes | 110–330 | ||||
| threadleaf sedge | CAFI | Carex filifolia | 110–275 | – | ||
| Grass-like (not a true grass) | 2GL | Grass-like (not a true grass) | 0–110 | – | ||
| 7 | Non-Native Grasses | 11–110 | ||||
| cheatgrass | BRTE | Bromus tectorum | 11–110 | – | ||
| bluegrass | POA | Poa | 0–22 | – | ||
|
Forb
|
||||||
| 8 | Forbs | 55–110 | ||||
| Forb, introduced | 2FI | Forb, introduced | 11–33 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 11–33 | – | ||
| spiny phlox | PHHO | Phlox hoodii | 0–22 | – | ||
| scurfpea | PSORA2 | Psoralidium | 0–22 | – | ||
| goldenrod | SOLID | Solidago | 11–22 | – | ||
| white prairie aster | SYFA | Symphyotrichum falcatum | 0–22 | – | ||
| Cuman ragweed | AMPS | Ambrosia psilostachya | 0–22 | – | ||
| deathcamas | ZIGAD | Zigadenus | 0–11 | – | ||
| buckwheat | ERIOG | Eriogonum | 0–11 | – | ||
| bladderpod | LESQU | Lesquerella | 0–11 | – | ||
| Forb, native | 2FN | Forb, native | 0–11 | – | ||
| western yarrow | ACMIO | Achillea millefolium var. occidentalis | 0–11 | – | ||
|
Shrub/Vine
|
||||||
| 9 | Shrubs | 55–165 | ||||
| prairie sagewort | ARFR4 | Artemisia frigida | 33–132 | – | ||
| pricklypear | OPUNT | Opuntia | 0–44 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 11–33 | – | ||
| soapweed yucca | YUGL | Yucca glauca | 0–33 | – | ||
| rose | ROSA5 | Rosa | 0–22 | – | ||
| western snowberry | SYOC | Symphoricarpos occidentalis | 0–22 | – | ||
| skunkbush sumac | RHTR | Rhus trilobata | 0–11 | – | ||
|
Tree
|
||||||
| 10 | Trees | 0–110 | ||||
| ponderosa pine | PIPO | Pinus ponderosa | 0–110 | – | ||
| bur oak | QUMA2 | Quercus macrocarpa | 0–110 | – | ||
| Tree | 2TREE | Tree | 0–66 | – | ||
| juniper | JUNIP | Juniperus | 0–66 | – | ||
Interpretations
Animal community
Animal Community – Grazing Interpretations
The following table lists annual, suggested initial stocking rates with average growing conditions. These are conservative estimates that should be used only as guidelines in the initial stages of conservation planning. Often, the current plant composition does not entirely match any particular plant community (as described in this ecological site description). Because of this a resource inventory is necessary to document plant composition and production. More accurate carrying capacity estimates should eventually be calculated using the following stocking rate information along with animal preference data and actual stocking records, particularly when grazers other than cattle are involved. With consultation of the land manager, more intensive grazing management may result in improved harvest efficiencies and increased carrying capacity.
Little Bluestem/Sideoats Grama/Big Bluestem (1.1)
Average Annual Production (lbs./acre, air-dry): 2,200
Stocking Rate* (AUM/acre): 0.60
Little Bluestem/Western Wheatgrass/Needleandthread (1.2)
Average Annual Production (lbs./acre, air-dry): 1,800
Stocking Rate* (AUM/acre): 0.49
Western Wheatgrass/Needleandthread/Sedge/Blue Grama (1.3)
Average Annual Production (lbs./acre, air-dry): 1,500
Stocking Rate* (AUM/acre): 0.41
Sedge/Blue Grama/Fringed Sagewort (2.1)
Average Annual Production (lbs./acre, air-dry): 1,100
Stocking Rate* (AUM/acre): 0.30
Little Bluestem/Sideoats Grama/Bur Oak/Ponderosa Pine (3.1)
Average Annual Production (lbs./acre, air-dry): 500
Stocking Rate* (AUM/acre): 0.14
* Based on 912 lbs./acre (air-dry weight) per Animal Unit Month (AUM), and on 25% harvest efficiency (refer to USDA NRCS, National Range and Pasture Handbook).
Grazing by domestic livestock is one of the major income-producing industries in the area. Rangeland in this area may provide yearlong forage. During the dormant period, the forage for livestock will likely be lacking protein to meet livestock requirements, and added protein will allow ruminants to better utilize the energy stored in grazed plant materials. A forage quality test (either directly or through fecal sampling) should be used to determine the level of supplementation needed.
Hydrological functions
Water is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic group B and D. Infiltration and runoff potential for this site varies from moderate to high depending on soil hydrologic group, slope and ground cover. In many cases, areas with greater than 75% ground cover have the greatest potential for high infiltration and lower runoff. An example of an exception would be where shortgrasses form a strong sod and dominate the site. Dominance by blue grama, buffalograss, bluegrass, and/or smooth bromegrass will result in reduced infiltration and increased runoff. Areas where ground cover is less than 50% have the greatest potential to have reduced infiltration and higher runoff (refer to Section 4, NRCS National Engineering Handbook for runoff quantities and hydrologic curves).
Recreational uses
This site provides hunting, hiking, photography, bird watching and other opportunities. The wide variety of plants that bloom from spring until fall have an esthetic value that appeals to visitors.
Wood products
No appreciable wood products are typically present on this site.
Other products
Seed harvest of native plant species can provide additional income on this site.
Supporting information
Inventory data references
Information presented here has been derived from NRCS clipping data and other inventory data. Field observations from range-trained personnel were also used. Those involved in developing this site include: Stan Boltz, Range Management Specialist, NRCS; Cynthia Englebert, Range Management Specialist, Forest Service; George Gamblin, Range Management Specialist, NRCS; Tate Lantz, Range Management Specialist, NRCS; Ryan Murray, Range Management Specialist, NRCS; Cheryl Nielsen, Range Management Specialist, NRCS; L. Michael Stirling, Range Management Specialist, NRCS; Jim Westerman, Soil Scientist, NRCS.
Other references
High Plains Regional Climate Center, University of Nebraska, 830728 Chase Hall, Lincoln, NE 68583-0728. (http://www.hprcc.unl.edu/)
USDA, NRCS. National Water and Climate Center, 101 SW Main, Suite 1600, Portland, OR 97204-3224. (http://wcc.nrcs.usda.gov)
USDA, NRCS. National Range and Pasture Handbook, September 1997
USDA, NRCS. National Soil Information System, Information Technology Center, 2150 Centre Avenue, Building A, Fort Collins, CO 80526. (http://nasis.nrcs.usda.gov)
USDA, NRCS. 2001. The PLANTS Database, Version 3.1 (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
Contributors
SCB
Stan Boltz
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) | Stan Boltz |
|---|---|
| Contact for lead author | Stan Boltz, stanley.boltz@sd.usda.gov, 605-352-1236 |
| Date | 09/30/2009 |
| Approved by | Stan Boltz |
| Approval date | |
| Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
If present, rills are short (roughly 6 inches long or less), sporadic, and discontinuous. Typically on steeper slopes. -
Presence of water flow patterns:
None, or barely visible and discontinuous with numerous debris dams when present. -
Number and height of erosional pedestals or terracettes:
Few pedastalled plants typically on steeper slopes. Terracettes not present. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground normally less than 10 percent, and patches less than 2 inches in diameter. -
Number of gullies and erosion associated with gullies:
Active gullies should not be present. -
Extent of wind scoured, blowouts and/or depositional areas:
None. -
Amount of litter movement (describe size and distance expected to travel):
Small size litter classes will generally move short distances, some medium size class litter will move very short distances. Litter debris dams are occasionally present. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil aggregate stability ratings typically 5 to 6, normally 6. Surface organic matter adheres to the soil surface. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Soil surface structure is typically granular, and mollic (higher organic matter) colors of A-horizon about 3 to 5 inches deep. If conditions are other than this, refer to map unit component descriptions for component on which the site occurs. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Combination of shallow and deep rooted species (mid & tall rhizomatous and tufted perennial cool- and warm-season grasses) with fine and coarse roots positively influences infiltration. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None – when dry, B horizons can be hard and appear to be compacted, but no platy structure will be present. -
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):
Dominant:
Mid, warm-season grasses >Sub-dominant:
Tall, warm-season grasses > mid and tall, cool-season bunchgrasses = wheatgrasses (mid cool-season) >Other:
Short, warm-season grasses = forbs = shrubs > grass-likes speciesAdditional:
Other grasses occur in other functional groups in minor amounts. -
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 and shrubs are vigorous. -
Average percent litter cover (%) and depth ( in):
65 to 75 percent plant litter cover, roughly 0.25 to 0.5 inch depth. Litter cover is in contact with soil surface. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Ranges from 1,700 to 2,800 pounds/acre. Reference value is 2,200 pounds/acre (air-dry weight basis). -
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:
Refer to State and Local Noxious Weed List. -
Perennial plant reproductive capability:
All species exhibit high vigor relative to climatic conditions. Do not rate based solely on seed production. Perennial grasses typically have vigorous rhizomes or tillers.
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