Natural Resources
Conservation Service
Ecological site R064XY049NE
Badlands Overflow
Accessed: 04/25/2024
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: 43h – White River Badlands.
Associated sites
R064XY048NE |
Badlands Terrace |
---|
Similar sites
R064XY048NE |
Badlands Terrace [No switchgrass; more little bluestem; less productive.] |
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Table 1. Dominant plant species
Tree |
Not specified |
---|---|
Shrub |
Not specified |
Herbaceous |
(1) Pascopyrum smithii |
Physiographic features
This site occurs in the eroded badlands on nearly level areas that receive additional water from overflow of intermittent streams or runoff from adjacent slopes.
Table 2. Representative physiographic features
Landforms |
(1)
Flood plain
(2) Drainageway (3) Alluvial fan |
---|---|
Flooding duration | Brief (2 to 7 days) |
Flooding frequency | Frequent |
Ponding frequency | None |
Elevation | 2,900 – 4,000 ft |
Slope | 3% |
Water table depth | 80 in |
Aspect | Aspect is not a significant factor |
Climatic features
MLRA 64 is considered to have a continental climate – cold winters and hot summers, low humidity, light rainfall, and much sunshine. Extremes in temperature may also abound. The climate is the result of this MLRA’s location near the geographic center of North America. There are few natural barriers on the northern Great Plains and the winds move freely across the plains and account for rapid changes in temperature.
Annual precipitation ranges from 14 to 20 inches per year. The normal average annual temperature is about 47° F. January is the coldest month with average temperatures ranging from about 21° F (Wood, SD) to about 25° F (Hemingford, NE). July is the warmest month with temperatures averaging from about 70° F (Keeline 3 W, WY) to about 76° F (Wood, SD). The range of normal average monthly temperatures between the coldest and warmest months is about 55° F. This large annual range attests to the continental nature of this area's climate. Hourly winds 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 strong storms may bring brief periods of high winds with gusts to more than 50 miles per hour.
Growth of native cool season plants begins mid to late March and continues to late June. Native warm season plants begin growth in early May and continue to late August. 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) | 143 days |
---|---|
Freeze-free period (average) | 163 days |
Precipitation total (average) | 20 in |
Figure 2. Monthly precipitation range
Figure 3. Monthly average minimum and maximum temperature
Influencing water features
Stream Type: B6, C6
(Rosgen System)
Soil features
The soils of this site are very deep, well drained soils that formed in sodium enriched alluvium. These soils typically have dispersive characteristics due to the high content of sodium. This feature tends to cause these soils to be naturally erosive, as the aggregate stability is low in the surface and structure is lacking in all horizons. These soils have moderate to moderately slow permeability. The surface soil will vary from 2 to 4 inches deep and have loam or silt loam textures. These areas receive additional water from overflow of intermittent streams or runoff from adjacent slopes. Available water capacity is typically high. This site should show slight to no evidence of rills, wind scoured areas or pedestalled plants. Water flow paths are broken, irregular in appearance or discontinuous with numerous debris dams or vegetative barriers. The soil surface is stable and intact. Sub-surface soil layers are not restrictive to water movement and root penetration.
These soils are mainly susceptible to water erosion. Headcuts may develop if adequate vegetative cover is not maintained or due to sinkholes or other soil sloughing due to piping as a result of natural features such as animal burrows, root channels, etc. A drastic loss of the soil surface layer on this site can result in a shift in species composition and/or production.
More information can be found in the various soil survey reports. Contact the local USDA Service Center for soil survey reports that include more detail specific to your location.
Table 4. Representative soil features
Surface texture |
(1) Silt loam (2) Loam |
---|---|
Family particle size |
(1) Loamy |
Drainage class | Well drained |
Permeability class | Moderately slow to moderate |
Soil depth | 80 in |
Surface fragment cover <=3" | Not specified |
Surface fragment cover >3" | Not specified |
Available water capacity (0-40in) |
8 – 9 in |
Calcium carbonate equivalent (0-40in) |
5 – 30% |
Electrical conductivity (0-40in) |
4 mmhos/cm |
Sodium adsorption ratio (0-40in) |
10 – 35 |
Soil reaction (1:1 water) (0-40in) |
7.4 – 9 |
Subsurface fragment volume <=3" (Depth not specified) |
10% |
Subsurface fragment volume >3" (Depth not specified) |
5% |
Ecological dynamics
The most significant influence in the development of this site is in relation to the geologic erosion episodes that occur on this and adjacent landscape positions in the White River Badlands. Due to the proximity of loose, weathered parent material, this site is constantly in flux. The Great Plains climate plays an important role, as sporadic heavy rainfall events cause fluctuating erosion and deposition to occur on this site. Recent grazing or browsing patterns do have an effect, but only if the site is stable long enough to establish vegetation for an extended period of time. While the following descriptions describe more typical transitions between communities that will occur, severe disturbances, such as periods of well-below average precipitation, can cause significant shifts in plant communities and/or species composition.
Continuous season-long grazing (during the typical growing season of May through October) and/or repeated seasonal grazing (e.g., every spring, every summer) without adequate recovery periods following each grazing occurrence causes this site to depart from the Switchgrass/Wheatgrass/ Needlegrass, Shrubs Plant Community. Wheatgrass increases initially and will eventually decrease with continuous grazing. Grasses such as switchgrass and green needlegrass will decrease in frequency and production. Reduction of vegetative cover can result in rapid degeneration of the site and high amounts of soil erosion. Headcuts and downcutting are relatively common, and can move this site to the Badlands Terrace site.
Interpretations are primarily based on the Switchgrass/Wheatgrass/Needlegrass, Shrubs Plant Community. 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 communities, states, transitional pathways, and thresholds have been determined through similar studies and experience.
The following is a diagram that illustrates the common plant communities that can occur on the site and the transition pathways between communities. The ecological processes will be discussed in more detail in the plant community descriptions following the diagram.
State and transition model
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View Interactive Models
Click on state and transition labels to scroll to the respective text
State 1 submodel, plant communities
State 2 submodel, plant communities
State 1
Switchgrass/Wheatgrass/Needlegrass, Shrubs
Community 1.1
Switchgrass/Wheatgrass/Needlegrass, Shrubs
Interpretations are based primarily on the Switchgrass/Wheatgrass/Needlegrass, Shrubs Plant Community (this is also considered climax). This plant community evolved with grazing by large herbivores and infrequent flooding. Potential vegetation is about 85% grasses or grass-like plants, 5% forbs, and 10% shrubs. The plant community is dominated by both warm and cool season grasses. The major grasses include western wheatgrass and/or thickspike wheatgrass, switchgrass, green needlegrass and needleandthread. Other grasses and grass-likes include big bluestem, prairie sandreed and tall dropseed. Significant forbs include cudweed sagewort, goldenrod and scurfpea. The dominant shrubs are rose, silver sagebrush and western snowberry. Big sagebrush occurs on this site in the western portion of the MLRA. This plant community is productive and diverse. 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 as long as extreme erosion or depositional events do not occur.
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 | 1835 | 2172 | 2500 |
Shrub/Vine | 45 | 144 | 250 |
Forb | 20 | 72 | 125 |
Tree | 0 | 12 | 25 |
Total | 1900 | 2400 | 2900 |
Figure 5. Plant community growth curve (percent production by month). NE6408, Pine Ridge/Badlands, lowland cool-season/warm-season co-dominant. Cool-season, warm-season co-dominant, lowland.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
J | F | M | A | M | J | J | A | S | O | N | D |
5 | 12 | 20 | 25 | 19 | 11 | 5 | 3 |
State 2
Wheatgrass/Needlegrass/Prairie Sandreed, Shrubs
Community 2.1
Wheatgrass/Needlegrass/Prairie Sandreed, Shrubs
This plant community is a result of continuous season-long grazing, natural erosion and/or deposition. Western wheatgrass and/or thickspike wheatgrass increase. Switchgrass, big bluestem and green needlegrass decrease, while prairie sandreed and needleandthread will increase. Other grasses and grass-likes include tall dropseed, little bluestem, sideoats grama, inland saltgrass and blue grama. Potential vegetation is about 80% grasses or grass-like plants, 10% forbs, and 10% shrubs. Production and diversity has declined somewhat compared to the Switchgrass/Wheatgrass/ Needlegrass, Shrubs Plant Community. There is typically more bare ground as a result of erosion and/or deposition. The plant community is still relatively stable, but more prone to continued erosion.
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 | 1370 | 1720 | 2065 |
Shrub/Vine | 35 | 120 | 205 |
Forb | 95 | 150 | 205 |
Tree | 0 | 10 | 25 |
Total | 1500 | 2000 | 2500 |
Figure 7. Plant community growth curve (percent production by month). NE6407, Pine Ridge/Badlands, cool-season dominant, warm-season sub-dominant. Cool-season dominant, warm-season sub-dominant, lowland.
Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
---|---|---|---|---|---|---|---|---|---|---|---|
J | F | M | A | M | J | J | A | S | O | N | D |
5 | 8 | 25 | 30 | 15 | 10 | 2 | 5 |
Additional community tables
Table 7. Community 1.1 plant community composition
Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
---|---|---|---|---|---|---|
Grass/Grasslike
|
||||||
1 | Wheatgrass | 240–600 | ||||
thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 240–600 | – | ||
western wheatgrass | PASM | Pascopyrum smithii | 240–600 | – | ||
2 | Needlegrass | 120–360 | ||||
needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 120–360 | – | ||
green needlegrass | NAVI4 | Nassella viridula | 120–360 | – | ||
3 | Tall Warm-Season Grasses | 480–840 | ||||
switchgrass | PAVI2 | Panicum virgatum | 120–480 | – | ||
big bluestem | ANGE | Andropogon gerardii | 120–360 | – | ||
prairie sandreed | CALO | Calamovilfa longifolia | 48–240 | – | ||
marsh muhly | MURA | Muhlenbergia racemosa | 0–120 | – | ||
prairie cordgrass | SPPE | Spartina pectinata | 0–120 | – | ||
4 | Warm-Season Grasses | 120–480 | ||||
composite dropseed | SPCOC2 | Sporobolus compositus var. compositus | 48–240 | – | ||
little bluestem | SCSC | Schizachyrium scoparium | 24–120 | – | ||
sideoats grama | BOCU | Bouteloua curtipendula | 48–120 | – | ||
blue grama | BOGR2 | Bouteloua gracilis | 0–120 | – | ||
hairy grama | BOHI2 | Bouteloua hirsuta | 0–120 | – | ||
saltgrass | DISP | Distichlis spicata | 0–72 | – | ||
plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–72 | – | ||
5 | Native Grasses and Grass-likes | 0–120 | ||||
Grass, perennial | 2GP | Grass, perennial | 0–120 | – | ||
Indian ricegrass | ACHY | Achnatherum hymenoides | 0–72 | – | ||
sedge | CAREX | Carex | 0–72 | – | ||
prairie Junegrass | KOMA | Koeleria macrantha | 0–72 | – | ||
Sandberg bluegrass | POSE | Poa secunda | 0–72 | – | ||
Forb
|
||||||
7 | Forbs | 24–120 | ||||
goldenrod | SOLID | Solidago | 24–72 | – | ||
Forb, perennial | 2FP | Forb, perennial | 24–72 | – | ||
white sagebrush | ARLU | Artemisia ludoviciana | 24–72 | – | ||
false boneset | BREU | Brickellia eupatorioides | 0–72 | – | ||
American licorice | GLLE3 | Glycyrrhiza lepidota | 0–72 | – | ||
scurfpea | PSORA2 | Psoralidium | 24–72 | – | ||
upright prairie coneflower | RACO3 | Ratibida columnifera | 24–48 | – | ||
dotted blazing star | LIPU | Liatris punctata | 0–48 | – | ||
scarlet beeblossom | GACO5 | Gaura coccinea | 24–48 | – | ||
common yarrow | ACMI2 | Achillea millefolium | 24–48 | – | ||
Cuman ragweed | AMPS | Ambrosia psilostachya | 0–48 | – | ||
white heath aster | SYER | Symphyotrichum ericoides | 24–48 | – | ||
American vetch | VIAM | Vicia americana | 24–48 | – | ||
Forb, annual | 2FA | Forb, annual | 0–24 | – | ||
vervain | VERBE | Verbena | 0–24 | – | ||
Shrub/Vine
|
||||||
8 | Shrubs | 50–150 | ||||
silver sagebrush | ARCA13 | Artemisia cana | 0–120 | – | ||
big sagebrush | ARTR2 | Artemisia tridentata | 0–120 | – | ||
willow | SALIX | Salix | 0–120 | – | ||
western snowberry | SYOC | Symphoricarpos occidentalis | 24–120 | – | ||
silver buffaloberry | SHAR | Shepherdia argentea | 0–72 | – | ||
rose | ROSA5 | Rosa | 24–72 | – | ||
Subshrub (<.5m) | 2SUBS | Subshrub (<.5m) | 0–72 | – | ||
rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–24 | – | ||
Tree
|
||||||
9 | Trees | 0–24 | ||||
plains cottonwood | PODEM | Populus deltoides ssp. monilifera | 0–24 | – |
Table 8. Community 2.1 plant community composition
Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
---|---|---|---|---|---|---|
Grass/Grasslike
|
||||||
1 | Wheatgrass | 300–600 | ||||
thickspike wheatgrass | ELLAL | Elymus lanceolatus ssp. lanceolatus | 300–600 | – | ||
western wheatgrass | PASM | Pascopyrum smithii | 300–600 | – | ||
2 | Needlegrass | 100–500 | ||||
needle and thread | HECOC8 | Hesperostipa comata ssp. comata | 100–400 | – | ||
green needlegrass | NAVI4 | Nassella viridula | 20–100 | – | ||
3 | Tall Warm-Season Grasses | 200–400 | ||||
prairie sandreed | CALO | Calamovilfa longifolia | 200–400 | – | ||
switchgrass | PAVI2 | Panicum virgatum | 0–60 | – | ||
big bluestem | ANGE | Andropogon gerardii | 0–60 | – | ||
prairie cordgrass | SPPE | Spartina pectinata | 0–20 | – | ||
4 | Warm-Season Grasses | 100–300 | ||||
little bluestem | SCSC | Schizachyrium scoparium | 40–300 | – | ||
composite dropseed | SPCOC2 | Sporobolus compositus var. compositus | 40–160 | – | ||
sideoats grama | BOCU | Bouteloua curtipendula | 40–160 | – | ||
blue grama | BOGR2 | Bouteloua gracilis | 20–100 | – | ||
hairy grama | BOHI2 | Bouteloua hirsuta | 0–100 | – | ||
saltgrass | DISP | Distichlis spicata | 20–100 | – | ||
plains muhly | MUCU3 | Muhlenbergia cuspidata | 0–40 | – | ||
5 | Native Grasses and Grass-likes | 20–100 | ||||
Indian ricegrass | ACHY | Achnatherum hymenoides | 0–100 | – | ||
sedge | CAREX | Carex | 0–60 | – | ||
prairie Junegrass | KOMA | Koeleria macrantha | 0–60 | – | ||
Sandberg bluegrass | POSE | Poa secunda | 0–60 | – | ||
Grass, perennial | 2GP | Grass, perennial | 0–60 | – | ||
6 | Non-Native Grasses | 20–100 | ||||
bluegrass | POA | Poa | 0–100 | – | ||
cheatgrass | BRTE | Bromus tectorum | 20–60 | – | ||
Forb
|
||||||
7 | Forbs | 100–200 | ||||
Forb, annual | 2FA | Forb, annual | 0–100 | – | ||
common yarrow | ACMI2 | Achillea millefolium | 20–100 | – | ||
American licorice | GLLE3 | Glycyrrhiza lepidota | 0–100 | – | ||
white sagebrush | ARLU | Artemisia ludoviciana | 20–100 | – | ||
white heath aster | SYER | Symphyotrichum ericoides | 20–100 | – | ||
goldenrod | SOLID | Solidago | 20–60 | – | ||
scurfpea | PSORA2 | Psoralidium | 20–60 | – | ||
upright prairie coneflower | RACO3 | Ratibida columnifera | 0–60 | – | ||
Cuman ragweed | AMPS | Ambrosia psilostachya | 20–60 | – | ||
Forb, perennial | 2FP | Forb, perennial | 20–60 | – | ||
American vetch | VIAM | Vicia americana | 0–60 | – | ||
cocklebur | XANTH2 | Xanthium | 0–40 | – | ||
curlycup gumweed | GRSQ | Grindelia squarrosa | 0–40 | – | ||
dotted blazing star | LIPU | Liatris punctata | 0–40 | – | ||
curly dock | RUCR | Rumex crispus | 0–40 | – | ||
scarlet beeblossom | GACO5 | Gaura coccinea | 0–40 | – | ||
vervain | VERBE | Verbena | 0–40 | – | ||
false boneset | BREU | Brickellia eupatorioides | 0–20 | – | ||
knotweed | POLYG4 | Polygonum | 0–20 | – | ||
Shrub/Vine
|
||||||
8 | Shrubs | 40–200 | ||||
silver sagebrush | ARCA13 | Artemisia cana | 0–200 | – | ||
big sagebrush | ARTR2 | Artemisia tridentata | 0–200 | – | ||
rose | ROSA5 | Rosa | 20–100 | – | ||
western snowberry | SYOC | Symphoricarpos occidentalis | 20–100 | – | ||
broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–60 | – | ||
silver buffaloberry | SHAR | Shepherdia argentea | 0–60 | – | ||
Subshrub (<.5m) | 2SUBS | Subshrub (<.5m) | 0–40 | – | ||
rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–40 | – | ||
fewflower buckwheat | ERPA9 | Eriogonum pauciflorum | 0–20 | – | ||
Tree
|
||||||
9 | Trees | 0–20 | ||||
Tree | 2TREE | Tree | 0–20 | – | ||
plains cottonwood | PODEM | Populus deltoides ssp. monilifera | 0–20 | – |
Interpretations
Hydrological functions
Water is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic group B. Infiltration rate is moderate. Runoff potential for this site varies from moderate to high depending on soil hydrologic group and ground cover. In many cases, areas with greater than 75% ground cover have the greatest potential for high infiltration and lower runoff. An example of an exception would be where short-grasses form a strong sod and dominate the site. Areas where ground cover is less than 50% have the greatest potential to have reduced infiltration and higher runoff (refer to Section 4, NRCS National Engineering Handbook).
Recreational uses
This site provides hunting, hiking, photography, bird watching and other opportunities. The wide varieties of plants that bloom from spring until fall have an esthetic value that appeals to visitors.
Wood products
No appreciable wood products are present on this site.
Other products
None noted.
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; Kent Cooley, Soil Scientist, NRCS; Rick Peterson, Range Management Specialist, NRCS; L. Michael Stirling Range Management Specialist, NRCS.
Other references
Carey, Carol. 2004. Provided art work for Plant Communities and Transitional Pathways diagram.
High Plains Regional Climate Center, University of Nebraska, 830728 Chase Hall, Lincoln, NE 68583-0728. (http://hpccsun.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.
USDA, NRCS, Various Published Soil Surveys.
Contributors
SCB
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 | 01/05/2010 |
Approved by | Stan Boltz |
Approval date | |
Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
None on stable areas; some rills present during early development phase. -
Presence of water flow patterns:
Typically none or barely visible on stable areas. Water flow patterns will be conspicuous on areas under the early development phase. -
Number and height of erosional pedestals or terracettes:
None. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
0 to 5 percent is typical on stable areas. On areas under the early development phase, 50 to 80 percent bare ground may occur. -
Number of gullies and erosion associated with gullies:
None typical, however limited headcutting may form after high runoff or flooding events. Existing gullies should be stabilized with good vegetative cover. Severe downcutting results in a shift to the Badlands Terrace ecological site. -
Extent of wind scoured, blowouts and/or depositional areas:
None typical on stable areas, but limited deposition may occur after major runoff or flooding events. Major deposition can occur on areas under the early development phase, especially adjacent to badlands. -
Amount of litter movement (describe size and distance expected to travel):
Litter of small and medium size classes will move after average to high rainfall events. Litter does not travel far, typically being trapped in small bunches by the extensive vegetative cover. Litter movement may be fairly extensive after major runoff or flooding events. -
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 3 to 4. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
A-horizon should be 2 to 6 inches thick, and mollic colors are typically not present. Structure typically is weak very thin platy structure in the A-horizon. -
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 on stable areas. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None – when dry, A horizon can appear to be compacted as platy structure is common. -
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):
Dominant:
Tall warm-season rhizomatous grasses > Mid cool-season rhizomatous grasses >Sub-dominant:
Mid/tall cool-season bunchgrasses > Mid/short warm-season grasses > Shrubs >Other:
ForbsAdditional:
-
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):
Litter cover is typically 50 to 70 percent, with depth roughly 0.25 to 0.5 inches. These values are for stable areas. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Total annual production ranges from 1,900 to 2,900 pounds/acre, with the reference value being 2,400 pounds/acre (air-dry 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:
State and local noxious weeds. -
Perennial plant reproductive capability:
All species exhibit high vigor relative to climatic conditions. Do not rate based solely on seed production. Perennial grasses should have vigorous rhizomes or tillers.
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