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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.
Classification relationships
Modal Soil: Fergus Family GRV-CL, 10-25% — fine, mixed Typic Argiborolls
Associated sites
R047XC320UT Upland Shallow Loam (black sagebrush)
R047XC326UT Upland Shallow Loam (pinyon/Utah juniper)
Similar sites
R047XC320UT Upland Shallow Loam (black sagebrush)
Table 1. Dominant plant species
Tree Not specified
Shrub (1) Artemisia nova
Herbaceous (1) Pseudoroegneria spicata
Physiographic features
Hill Sides
Table 2. Representative physiographic features
Landforms (1) Hill
Elevation 7800 – 8500 ft Slope 10 – 25 % Climatic features
The climate is characterized by cool, moist summers and cold, snowy winters. Approximately 60 percent of the moisture comes as rain from May through October. On the average, January through April are the driest months and May through October are the wettest months. The soil moisture regime is ustic and soil temperatrures are in the frigid regime.
Table 3 Representative climatic features
Frost-free period (average) 90 days Freeze-free period (average) 0 days Precipitation total (average) 20 in BarLineFigure 1. Monthly precipitation range
BarLineFigure 2. Monthly average minimum and maximum temperature
">Influencing water features
Soil features
This site occurs on hill sides. The soil is deep and well drained. It formed in colluvium and residuum derived from sandstone, shale and quartzite parent materials. The surface soil is very gravelly clay loam about 9 to 12 inches thick. Forty percent of the soil surface is covered by rock fragments. Available water capacity is 0.12 to 0.14 inches per inch.
Table 4. Representative soil features
Surface texture (1) Very gravelly clay loam
Drainage class Well drained Soil depth 40 – 60 in Available water capacity
(0-40in)0.12 – 0.14 in Ecological dynamics
As this site deteriorates due to livestock grazing pressure perennial grasses, blue flax, and balsamroot decrease while black sagebrush increases. Fire will reduce or eliminate black sagebrush but perennial and annual grasses and forbs will increase. Utah juniper may invade this 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
State 1 submodel, plant communities
State 1
Reference StateCommunity 1.1
Reference StateThe general view of this area is. The composition by air-dry weight is approximately 40 percent grasses and grasslike plants, 15 percent forbs, 45 percent shrubs, and 5-10 percent trees.
Figure 3. 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 160 240 300 Shrub/Vine 160 240 300 Forb 60 90 113 Tree 20 30 38 Total 400 600 751 Table 6. Ground cover
Tree foliar cover 0% Shrub/vine/liana foliar cover 10-20% Grass/grasslike foliar cover 40-40% Forb foliar cover 0-10% Non-vascular plants 0% Biological crusts 0% Litter 0% Surface fragments >0.25" and <=3" 0% Surface fragments >3" 0% Bedrock 0% Water 0% Bare ground 0% Table 7. Canopy structure (% cover)
Height Above Ground (ft) Tree Shrub/Vine Grass/
GrasslikeForb <0.5 – – – – >0.5 <= 1 – – – 4-6% >1 <= 2 – 14-16% 39-41% – >2 <= 4.5 – – – – >4.5 <= 13 – – – – >13 <= 40 – – – – >40 <= 80 – – – – >80 <= 120 – – – – >120 – – – – Additional community tables
Table 8. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Shrub/Vine0 Dominant Shrub 98–130 black sagebrush ARNO4 Artemisia nova 98–130 – 3 Sub-Dominant Shrubs 56–153 Shrub (>.5m) 2SHRUB Shrub (>.5m) 20–33 – Utah serviceberry AMUT Amelanchier utahensis 7–20 – yellow rabbitbrush CHVIV4 Chrysothamnus viscidiflorus ssp. viscidiflorus var. viscidiflorus 7–20 – slender buckwheat ERMI4 Eriogonum microthecum 7–20 – winterfat KRLA2 Krascheninnikovia lanata 7–20 – plains pricklypear OPPO Opuntia polyacantha 7–20 – spineless horsebrush TECA2 Tetradymia canescens 7–20 – Grass/Grasslike0 Dominant Grasses 281–358 bluebunch wheatgrass PSSP6 Pseudoroegneria spicata 228–260 – prairie Junegrass KOMA Koeleria macrantha 33–65 – 1 Sub-Dominant Grasses 35–100 Grass, annual 2GA Grass, annual 7–20 – Grass, perennial 2GP Grass, perennial 7–20 – Indian ricegrass ACHY Achnatherum hymenoides 7–20 – needle and thread HECO26 Hesperostipa comata 7–20 – Sandberg bluegrass POSE Poa secunda 7–20 – Forb0 Dominant Forbs 60–99 blue flax LIPE2 Linum perenne 20–33 – spiny phlox PHHO Phlox hoodii 20–33 – stemless mock goldenweed STAC Stenotus acaulis 20–33 – 2 Sub-Dominant Forbs 117–198 Forb, annual 2FA Forb, annual 20–33 – Forb, perennial 2FP Forb, perennial 20–33 – littleleaf pussytoes ANMI3 Antennaria microphylla 7–13 – lesser rushy milkvetch ASCO12 Astragalus convallarius 7–13 – cutleaf balsamroot BAMA4 Balsamorhiza macrophylla 7–13 – arrowleaf balsamroot BASA3 Balsamorhiza sagittata 7–13 – Douglas' dustymaiden CHDO Chaenactis douglasii 7–13 – bastard toadflax COUM Comandra umbellata 7–13 – roughseed cryptantha CRFL6 Cryptantha flavoculata 7–13 – hoary tansyaster MACA2 Machaeranthera canescens 7–13 – rock goldenrod PEPU7 Petradoria pumila 7–13 – Rocky Mountain penstemon PEST2 Penstemon strictus 7–13 – Pacific aster SYCHC Symphyotrichum chilense var. chilense 7–13 – Interpretations
Animal community
This site provides grazing for sheep and cattle during spring, summer, and fall.
The site provides food and cover for a few species of wildlife.
Wildlife species using this site include sage grouse, rabbit, coyote, and mule deer.
Hydrological functions
The soils in this site are in hydrologic group b and the hydrologic curve number is 61 when the vegetation is in good condition.
Recreational uses
This site offers color and aesthetic appeal during the growing season.
Wood products
None
Supporting information
Contributors
Garth W. Leishman, Lars L. Rassmussen
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) V. Keith Wadman (NRCS Retired). Contact for lead author shane.green@ut.usda.gov Date 10/17/2012 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
None to very few. Some very minor rill development may occur on steeper slopes (>15%) or on areas located below exposed bedrock or other water shedding areas where increased runoff may occur. Any rills present should be <1 inch deep, fairly short (<6 feet long) and somewhat widely spaced (8-10 feet). Minor rill development may be observed following major thunderstorm or spring runoff events, but they should heal during the next growing season. -
Presence of water flow patterns:
Slight. Some very minor evidence of water flow patterns may be found around perennial plant bases. They show little evidence of current erosion. They are expected to be somewhat short (3-6 feet), stable, sinuous and not connected. There may also be very minor evidence of deposition. Evidence of water flow may increase somewhat with slope. -
Number and height of erosional pedestals or terracettes:
None to Slight. Perennial vegetation shows little evidence of erosional pedestalling (2 to 3% of individual plants). Plant roots are covered and litter remains in place around plant crowns. Terracettes should be absent or, if present, stable. A slight increase in both pedestal and terracette development may occur with increasing slope. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
25-30% bare ground. Soil surface is typically covered by <15% coarse fragments. Bare ground spaces should not be greater than 2 to 3 feet in diameter and should not be connected. -
Number of gullies and erosion associated with gullies:
None to Very Few. A few gullies may be present in landscape settings where they transport runoff from areas of greater water flow such as exposed bedrock. These gullies will be limited to slopes exceeding 20% slope and adjacent to sites where this runoff accumulation occurs. Any gullies present should show little sign of accelerated erosion and should be stabilized with perennial vegetation. -
Extent of wind scoured, blowouts and/or depositional areas:
None. No evidence of wind generated soil movement is expected. -
Amount of litter movement (describe size and distance expected to travel):
Most litter resides in place with some redistribution caused by water movement. Minor litter removal may occur in flow channels with deposition occurring within 1 to 2 feet at points of obstruction. The majority of litter accumulates at the base of plants. Some grass leaves and small twigs (grass stems) may accumulate in soil depressions adjacent to plants. Woody stems are not likely to move. However, some litter movement is expected (up to 6 feet) with increases in slopes >10% and/or increased runoff resulting from heavy thunderstorms. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
This site should have a soil stability rating of 4 or 5 under the plant canopies, and a rating of 3 to 4 in the interspaces. The average rating should be a 4. Soil surface texture is typically a clay loam. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
(Fergus) Soil surface 0-4 inches. Texture is a clay loam; color is dark brown (7.5YR 5/2); structure is medium granular. Mollic epipedon ranges to 15 inches. Use the specific information for the soil you are assessing found in the published soil survey to supplement this description. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
The clay loam surface texture and clay within the soil profile would be expected to provide a runoff surface that would naturally reduce infiltration in all but gentle storms and slow snowmelt. Perennial vegetation produces sufficient cover and spatial arrangement to intercept most raindrops and reduce raindrop splash erosion. Litter on soil surface and cryptogamic crusting, where present, also protects soil from splash erosion and encourages a higher rate of infiltration. Good plant spatial distribution should slow runoff, allowing additional time for infiltration. Bare spaces are expected to be small and irregular in shape and are usually not connected. Vegetative structure is usually adequate to capture snow and ensure that snowmelt occurs in a controlled manner, allowing maximum time for infiltration, and reducing runoff and erosion in all but the most extreme storm events. When perennial grasses and shrubs decrease due to natural events including drought, insect damage, etc., which reduce ground cover and increasing bare ground, runoff is expected to increase and any associated infiltration reduced. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None. This site has a well developed argillic horizon beginning at 9 inches that should not be mistaken for a compaction laver. -
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:
Sprouting shrubs (black sagebrush, green rabbitbrush), > Perennial bunchgrasses (bluebunch wheatgrass, prairie junegrass).Sub-dominant:
Other perennial bunchgrasses (Nevada bluegrass, needle-and-thread >> Rhizomatous grasses (western wheatgrass) > Shrubs (slender wild buckwheat) >> Perennial forbs (stemless goldenweed).Other:
Perennial and annual forbs can be expected to vary widely in their expression in the plant community based upon departures from average growing conditions.Additional:
Natural disturbance regimes include fire, drought, and insects. Assumed fire cycle of 50 to 60+ years. Functional/structural groups may appropriately contain non-native species if their ecological function is the same as the native species in the reference state. Following a disturbance such as fire, drought, rodents or insects that remove woody vegetation, forbs and perennial grasses (herbaceous species) may dominate the community for a period of time. If a disturbance has not occurred for an extended period of time, woody species may continue to increase. These conditions would reflect a functional community phase within the reference state. -
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
All age classes of perennial grasses should be present under average to above average growing conditions with age class expression likely subdued during periods of extended drought. Slight decadence in the principle shrubs could occur near the end of the fire cycle or during periods of extended drought, or insect infestations. In general, a mix of age classes should be expected with some dead and decadent plants present. -
Average percent litter cover (%) and depth ( in):
Litter cover will be heavier under plants. Most litter will be herbaceous and depths of 1/2 to 3/4 inch would be considered normal. Perennial vegetation should be well distributed on the site. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Annual production in air-dry herbage should be approximately 550 - 650#/acre on an average year, but could range from 350 to 800#/acre during periods of prolonged drought or above average precipitation. -
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:
Cheatgrass, halogeton, Russian thistle, Utah juniper, alyssum, & mustard species. -
Perennial plant reproductive capability:
All perennial plants should have the ability to reproduce in all years, except in extreme drought years. Green rabbitbrush sprouts vigorously following fire. There are no restrictions on either seed or vegetative reproduction. Some seedling recruitment of major species is present during average and above average growing years.
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