Natural Resources
Conservation Service
Ecological site R034BY009UT
Loamy Bottom (Basin Big Sagebrush)
Last updated: 3/05/2022
Accessed: 11/21/2024
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.
MLRA notes
Major Land Resource Area (MLRA): 034B–Warm Central Desertic Basins and Plateaus
MLRA 34B occurs in is in Utah (70 percent) and Colorado (30 percent). It makes up about 12,850 square miles (33,290 square kilometers). A small part of the area is in the High Plateaus of Utah Section of the Colorado Plateaus Province of the Intermontane Plateaus. The northern part of the MLRA occurs in the Uinta Basin Section, which is bounded by the Uinta Mountains to the north, the Wasatch Range to the west, the Roan Plateau to the south, and the Rabbit Hills to the east. The southern part of the MLRA occurs in the northern third of the Canyon Lands Section. This section is bounded by the Roan Plateau to the north, the Wasatch Plateau to the west, the southern end of the San Rafael Swell to the south, and the western slope of the Rocky Mountains to the east. Elevation ranges from 4,100 feet (1,250 meters) near Green River, Utah, to 7,500 feet (2,285 meters) at the base of the Wasatch Range and the Roan Plateau.
Most of this area is covered by residual basin-floor materials and materials washed in from the surrounding mountains and plateaus. Shale and sandstone are the dominant rock types. The Tertiary-age Green River, Uinta, and Duchesne Formations dominate the northern part of the MLRA. The southern part is dominated by Cretaceous-age materials with lesser amounts of Jurassic and Triassic materials. The dominant Cretaceous formations are Mancos Shale, Dakota Sandstone, and the members of the Mesa Verde Group. The dominant Jurassic formations are the Morrison, Entrada, and Navajo. The dominant Triassic formations are the Chinle and Moenkopi. Quaternary alluvial, eolian, and glacial deposits occur in both parts of the MLRA.
The average annual precipitation in most of this area ranges from 6 to 10 inches (150 to 255 millimeters). A small part of this area receives as much as 24 inches of annual precipitation.
Much of the precipitation occurs as high-intensity, convective thunderstorms during the period July through September. May and June are usually the drier months. Precipitation is more evenly distributed throughout the year in the northern part of the MLRA than in the southern part, where there is a significant peak in late summer. The northern part of the MLRA receives more precipitation as snow during winter than the southern part. The average annual temperature ranges from 41 to 54 degrees F (5 to 12 degrees C). The freeze-free period averages 170 days and ranges from 110 to 235 days.
The dominant soil orders in this MLRA are Aridisols and Entisols. Mollisols occur at the higher elevations, particularly in the northern part of the MLRA. The dominant soil temperature regime is mesic, and the dominant soil moisture regime is aridic. The soils receiving less than 8 inches (205 millimeters) of precipitation annually have an aridic soil moisture regime. The soils receiving 8 to 12 inches (205 to 305 millimeters) have an aridic soil moisture regime that borders on ustic. The soils receiving 12 to 16 inches (305 to 405 millimeters) generally have an ustic soil moisture regime that borders on aridic. The dominant soil mineralogy is mixed and soils are formed in slope alluvium or residuum derived from shale or sandstone. Many of the soils are shallow or moderately deep to shale or sandstone bedrock. The soils at the lower elevations generally have significant amounts of calcium carbonate, salts, and gypsum.
Ecological site concept
The soils of this site formed mostly in alluvium from mixed sedimentary rock. Surface soils are loam, fine sandy loam and sandy loam in texture. Rock fragments may be present on the soil surface and throughout the profile, but make up less than 35 percent of the soil volume. These soils are deep to very deep, moderately well to well-drained, and have moderately slow to moderately rapid permeability. pH is slightly to strongly alkaline.. Available water-holding capacity ranges from 3 to 8 inches of water in the upper 60 inches of soil. The soil moisture regime is typic aridic to ustic aridic and the soil temperature regime is mesic. Precipitation ranges from 6-12 inches annually.
Table 1. Dominant plant species
| Tree |
Not specified |
|---|---|
| Shrub |
(1) Artemisia tridentata ssp. tridentata |
| Herbaceous |
(1) Leymus cinereus |
Physiographic features
Slope on this site ranges from 0 to 8%. Common landforms this site is found on include: floodplains, alluvial fans, insert fans, drainages, and flooded slopes
Table 2. Representative physiographic features
| Landforms |
(1)
Flood plain
(2) Alluvial flat |
|---|---|
| Runoff class | Low to medium |
| Flooding duration | Very brief (4 to 48 hours) to brief (2 to 7 days) |
| Flooding frequency | None to rare |
| Ponding frequency | None |
| Elevation | 4,000 – 7,000 ft |
| Slope | 8% |
| Ponding depth |
Not specified |
| Water table depth |
Not specified |
| Aspect | W, NW, N, NE, E, SE, S, SW |
Climatic features
Average annual precipitation is 6 to 12 inches. Approximately 55 percent occurs as rain from March through May. On the average, June through September are the driest months and March through May are the wettest months. The mean annual air temperature is 7 Celsius and the soil temperatures are in the mesic regime. The average freeze-free period is 115 to 125 days. This site receives run-in moisture from surrounding areas which supplies much of the plant's water needs. In average years, plants begin growth around March 10 and end growth around October 15.
Table 3. Representative climatic features
| Frost-free period (actual range) | 110-140 days |
|---|---|
| Freeze-free period (actual range) | 115-125 days |
| Precipitation total (actual range) | 6-12 in |
Influencing water features
This site receives extra moisture from adjacent upland positions in the form of run-in.
Soil features
The soils of this site formed mostly in alluvium from mixed sedimentary rock. Surface soils are loam, fine sandy loam and sandy loam in texture. Rock fragments may be present on the soil surface and throughout the profile, but make up less than 35 percent of the soil volume. These soils are deep to very deep, moderately well to well-drained, and have moderately slow to moderately rapid permeability. pH is slightly to strongly alkaline.. Available water-holding capacity ranges from 3 to 8 inches of water in the upper 60 inches of soil. The soil moisture regime is typic aridic to ustic aridic and the soil temperature regime is mesic.
Table 4. Representative soil features
| Parent material |
(1)
Alluvium
–
sedimentary rock
|
|---|---|
| Surface texture |
(1) Loam (2) Fine sandy loam (3) Sandy loam |
| Family particle size |
(1) Fine-loamy (2) Coarse-loamy |
| Drainage class | Moderately well drained to well drained |
| Permeability class | Moderately slow to moderately rapid |
| Depth to restrictive layer | 60 – 100 in |
| Soil depth | 60 – 100 in |
| Surface fragment cover <=3" | 15% |
| Surface fragment cover >3" | 10% |
| Available water capacity (Depth not specified) |
3 – 8 in |
| Calcium carbonate equivalent (Depth not specified) |
1 – 15% |
| Electrical conductivity (Depth not specified) |
4 mmhos/cm |
| Sodium adsorption ratio (Depth not specified) |
13 |
| Soil reaction (1:1 water) (Depth not specified) |
7.4 – 9 |
| Subsurface fragment volume <=3" (Depth not specified) |
20% |
| Subsurface fragment volume >3" (Depth not specified) |
15% |
Ecological dynamics
Ecological Dynamics of the Site
It is impossible to determine in any quantitative detail the historic climax plant community (HCPC) for this ecological site because of the lack of direct historical documentation preceding all human influence. In some areas, the earliest reports of dominant plants include the cadastral survey conducted by the General Land Office, which began in the late 19th century for this area (Galatowitsch 1990). However, up to the 1870s the Shoshone Indians, prevalent in northern Utah and neighboring states, grazed horses and set fires to alter the vegetation for their needs (Parson 1996). In the 1860s, Europeans brought cattle and horses to the area, grazing large numbers of them on unfenced parcels year-long (Parson 1996). Itinerant and local sheep followed, largely replacing cattle as the browse component increased.
Below is a State and Transition Model diagram to illustrate the “phases” (common plant communities), and “states” (aggregations of those plant communities) that can occur on the site. Differences between phases and states depend primarily upon observations of a range of disturbance histories in areas where this ESD is represented. These situations include grazing gradients to water sources, fence-line contrasts, patches with differing dates of fire, herbicide treatment, tillage, etc. Reference State 1 illustrates the common plant communities that probably existed just prior to European settlement.
The major successional pathways within states, (“community pathways”) are indicated by arrows between phases. “Transitions” are indicated by arrows between states. The drivers of these changes are indicated in codes decipherable by referring to the legend at the bottom of the page and by reading the detailed narratives that follow the diagram. The transition between Reference State 1 and State 2 is considered irreversible because of the naturalization of exotic species of both flora and fauna, possible extinction of native species, and climate change. There may have also been accelerated soil erosion.
When available, monitoring data (of various types) were employed to validate more subjective inferences made in this diagram. See the complete files in the office of the State Range Conservationist for more details.
The plant communities shown in this State and Transition Model may not represent every possibility, but are probably the most prevalent and recurring plant communities. As more monitoring data are collected, some phases or states may be revised, removed, and/or new ones may be added. None of these plant communities should necessarily be thought of as “Desired Plant Communities.” According to the USDA NRCS National Range & Pasture Handbook (USDA-NRCS 2003), Desired Plant Communities (DPC’s) will be determined by the decision-makers and will meet minimum quality criteria established by the NRCS. The main purpose for including descriptions of a plant community is to capture the current knowledge at the time of this revision.
State 1: Reference State
Community Phase 1.1: Reference State
The Reference State is a description of this ecological site just prior to Euro-American settlement but long after the arrival of Native Americans. The description of the Reference State was determined by NRCS Soil Survey Type Site Location information and familiarity with rangeland relict areas where they exist. The Reference State for this site would have been characterized as a shrub steppe co-dominated by basin big sagebrush (Artemisia tridentata ssp. tridentata), the dominant shrub, and having a rich herbaceous understory. The proportions of shrubs and herbs would have been dependent upon the length of time elapsed since the last wildfire or other sagebrush-killing event. If fire had not occurred within the past 30 years (1.2a), basin big sagebrush would have been the dominant shrub, having a native perennial herbaceous understory (1.1). If less than 10 years had elapsed since the last fire (1.1a), perennial native herbs would have increased and the shrub component would have been dominated by root-sprouting species such as rubber rabbitbrush (Ericameria nauseosa), and yellow rabbitbrush (Chrysothamnus viscidiflorus) (1.2). Soil anoxia from extremely wet years or an outbreak of Aroga (Aroga spp.) moth (1.1b) could have also reduced sagebrush and enhanced root-sprouting shrubs and perennial herbs (1.2) in some years. The same effect would have also been achieved by parch blight due to lack of snow cover during dry, cold winters (1.1c). A more complete list of species by lifeform for the Reference State is available in the accompanying tables in the “Plant Community Composition by Weight and Percentage” section of this document.
Community Phase 1.1: Basin big sagebrush/ abundant native perennial herbs
This plant community would have developed in the absence of recent fire and was characterized by basin big sagebrush and abundant native perennial herbs. Primary bunchgrasses would have included basin wildrye (Leymus cinereus), needle-and-thread (Hesperostipa comata), Indian ricegrass (Achnatherum hymenoides), and bluebunch wheatgrass (Pseudoroegneria spicata).
Community Pathway 1.1a
Wildfire would have removed basin big sagebrush, allowing root-sprouting shrubs and the native perennial forbs and grasses to increase.
Community Pathway 1.1b
An extremely wet period such as an El Nino-Southern Oscillation event and subsequent anoxious soil conditions would have killed off basin big sagebrush and converted the plant community to one dominated by root-sprouting shrubs and native perennial herbs. The same result would have been seen following a sudden insect (e.g. Aroga moth), or other pathogen outbreak on sagebrush.
Community Pathway 1.1c
Unusually cold, dry winters may have caused severe parch blight, killing off substantial portions of sagebrush and allowing roots-sprouting shrubs and native perennial herbs to dominate the plant community.
Community Phase 1.2: root-sprouting shrubs/ increased perennial herbs
This phase of the Reference State would have been dominated by root-sprouting shrubs such as rubber rabbitbrush, yellow rabbitbrush, and snakeweed (Gutierrezia sarothrae), with a rich understory of native perennial herbs.
Community Pathway 1.2a
In the absence of fire, this plant community would have responded with an increase in basin big sagebrush and a corresponding decrease in native perennial herbs.
T1a: Transition from State 1 to State 2 (Reference State to Basin Big Sagebrush/ Introduced Non-natives State)
The simultaneous introduction of exotic species, both plants and animals, and possible extinctions, along with climate change, has caused State 1 to transition to State 2. Reversal of such historic changes (i.e. a return pathway) back to State 1 is not practical.
State 2: Basin Big Sagebrush/ Introduced Non-native Herbs State
Community Phase 2.2: Basin Big Sagebrush/ Introduced Non-native Herbs State
State 2 is very similar to State 1 in form and function, with the exception of the presence of non-native plants and animals, possible extinctions of native species, and a different climate. State 2 is a description of the ecological site shortly following Euro-American settlement. This State can be regarded as the current potential. As with State 1, a shift will be seen in the abundance of basin big sagebrush relative to the perennial herbs based upon the amount of time that has elapsed since the last wildfire or other sagebrush-killing event. Wildfire (2.1a) will temporarily remove basin big sagebrush, allowing root-sprouting shrubs and all types of herbs (both native and non-native) to increase (2.2). Lack of fire (2.2a) will favor the return of basin big sagebrush provided that there is adequate seed source from adjacent unburned areas. Perennial native herbs and non-native annuals will maintain their presence post-fire. Other drivers that could reduce sagebrush and favor root-sprouting shrubs (2.2) include anoxic soils from extremely wet years, outbreaks of Aroga moth (2.1b), or parch blight due to lack of snow cover during dry cold winters (2.1c). The resiliency of this State is maintained by a healthy, productive, and diverse plant community that can provide native seed sources and promotes soil stability, water infiltration, and soil moisture retention. The resiliency of this State can be maintained by reducing livestock grazing impacts, especially during the growing season of perennial herbs. Conversely, continued heavy grazing will negatively impact the resiliency of this State.
Community Phase 2.1: Basin big sagebrush/ abundant native perennial herbs
This plant community will develop in the absence of fire and is characterized by basin big sagebrush with an understory made up of both native perennial and introduced herbs. Bunchgrasses include basin wildrye, needle-and-thread, Indian ricegrass, and bluebunch wheatgrass. Common invaders are cheatgrass and Russian thistle.
Community Pathway 2.1a
Wildfire will remove basin big sagebrush, allowing root-sprouting shrubs and the native perennial forbs and grasses to increase.
Community Pathway 2.1b
An extremely wet period such as an El Nino-Southern Oscillation event and subsequent anoxious soil conditions can kill basin big sagebrush and convert the plant community to one dominated by root-sprouting shrubs and native perennial herbs. The same result would be seen following a sudden insect (e.g. Aroga moth) or other pathogen outbreak on sagebrush.
Community Pathway 2.1c
Unusually cold, dry winters may cause severe parch blight, killing substantial portions of sagebrush and allowing roots-sprouting shrubs and native perennial herbs to dominate the plant community.
Community Phase 2.2: root-sprouting shrubs/ increased native perennial herbs
This plant community is dominated by root-sprouting shrubs such as rubber rabbitbrush, and yellow rabbitbrush, with a rich understory of native perennial herbs.
Community Pathway 2.2a
In the absence of fire, this plant community will respond with an increase in basin big sagebrush and a corresponding decrease in native perennial herbs.
T2a: Transition from State 2 to State 3 (Basin Big Sagebrush/ Introduced Non-native Herbs State to Brush Super-dominance State)
The Basin Big Sagebrush/ Introduced Non-natives State will transition to the Brush Super-dominance State following excessive livestock grazing, particularly during the growing season of herbs. Native perennial herbs are eventually depleted such that mere reduction or removal of livestock will not allow for their recovery. The approach to this transition is indicated by the dominance of large, old sagebrush. This transition can be avoided by removal or reduction of sagebrush by prescribed fire, herbicides, or mechanical means well before the diminishment of native perennial herbs has occurred.
State 3: Brush Super-dominance State
Community Phase 3.3: Brush Super-dominance State
With multiple-year heavy livestock grazing, especially during the growing season, native perennial herbs are diminished. Once the soil seed reserve is exhausted, there is little opportunity for recovery. In the absence of fire (3.2a) basin big sagebrush will begin to dominate (3.1). Where mechanical or fire damage occur to the non-sprouting basin big sagebrush (3.1a), root-sprouting shrubs can increase (3.2). The state is maintained by the lack of a healthy, productive and diverse herb component capable of providing native seed source, soil stabilization, and soil moisture retention.
Community Phase 3.1: Basin big sagebrush super-dominance
This plant community is characterized as a basin big sagebrush-dominated site where the understory is greatly diminished in species richness and abundance from heavy continuous livestock grazing and lack of fire.
Community Pathway 3.1a
Wildfire or mechanical removal of sagebrush will develop a plant community dominated by root-sprouting shrubs.
Community Phase 3.2: Root-sprouting shrubs super-dominance
As the site deteriorates from heavy continuous livestock grazing compounded by fire or mechanical removal of sagebrush, the plant community will become dominated by root-sprouting shrubs such as rubber rabbitbrush, and yellow rabbitbrush.
Community Pathway 3.2a
After an extended period without wildfire, provided a viable seed source is available, basin big sagebrush will begin to re-establish and dominate the site.
T3a: Transition from State 3 to State 4 (Brush Super-dominance State to Seeded State)
Because reduction or exclusion of livestock use will not allow ready recovery of the herbaceous understory in State 3, the manager is left with few options to increase the perennial herbaceous cover. Tillage followed by re-seeding is the usual action required. Thus, the transition from a Brush Super-dominance State (regardless of phase) to the Seeded State is commonly seen.
State 4: Seeded State
Community Phase 4.4: Seeded State
The most common seedings of the past have been to Eurasian wheatgrasses (Agropyron spp.) or ryegrasses (Elymus spp.) (4.1). Where tillage has been employed, the native forbs and browse have most likely been destroyed. Thus, if a more diverse plant community is required (4.2), other species will have to be added to the seed mix and utilization by livestock deferred for several years (4.1a). In some circumstances, the native forbs and shrubs will slowly re-establish (4.2 and 4.3) when adjacent area have not been tilled. Once a site is re-established with forbs and shrubs (4.2) and a sufficient length of time has elapsed since the last fire (4.2b), pioneering shrubs such as snakeweed, rubber rabbitbrush, and yellow rabbitbrush may dominate the site (4.3). Returning to a more diverse plant community (4.2) may require mechanically removing some shrubs and re-seeding (4.3b). This State can be maintained by moderate levels of livestock use or alteration of dates of use, particularly during the boot stage of the grass. Heavy spring use by livestock will reduce the resiliency of this State.
Community Phase 4.1: crested wheatgrass monoculture
This plant community is predominantly a monoculture of a seeded species, commonly crested wheatgrass (Agropyron cristatum).
Community Pathway 4.1a
Re-seeding with a mix of forbs and shrubs combined with limited use/prescribed grazing by livestock will be necessary to facilitate the re-establishment of a more diverse plant community.
Community Phase 4.2: re-invaded herbs and shrubs
This plant community is characterized by a mix of native and non-native herbs and shrubs that have re-invaded or been seeded into the site. Disturbance follower species that may be present include snakeweed, rubber rabbitbrush, yellow rabbitbrush, and Russian thistle (Salsola sp.). Other re-invaders could also include bulbous bluegrass (Poa bulbosa), or Kentucky bluegrass (Poa pratensis).
Community Pathway 4.2a
Either mechanical or chemical brush management will be required to maintain a grass-dominated site.
Community Pathway 4.2b
The absence of fire will shift this community into a re-invaded shrub-dominated site.
Community Phase 4.3: re-invaded shrub dominance
Disturbance following shrubs such as snakeweed, rubber rabbitbrush, and yellow rabbitbrush may dominate the site in the absence of fire.
Community Pathway 4.3a
Either mechanical or chemical brush management will be required to maintain a grass-dominated site.
Community Pathway 4.3b
Mechanically removing some shrubs and re-seeding with a diverse mixture of forbs and grasses will improve the balance between the herbaceous and shrub components.
State and transition model
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Ecosystem states
State 1 submodel, plant communities
State 1
Community 1.1
The dominant aspect of this plant community is basin big sagebrush and Great Basin wildrye. The composition by air-dry weight is approximately 65 percent perennial grasses, 10 percent forbs, and 25 percent shrubs. As ecological condition deteriorates due to over grazing, perennial grasses decrease while basin big sagebrush and rubber rabbitbrush increase to dominate the site. When the potential natural plant community is burned, basin big sagebrush will decrease while Great Basin wildrye and other grasses will increase. Cheatgrass, halogeton, and other annual weeds are most likely to invade this site and will dominate after fire if this site is in early seral progression when the fire occurs.
Figure 2. 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 | 617 | 1072 | 1692 |
| Shrub/Vine | 238 | 413 | 613 |
| Forb | 95 | 165 | 245 |
| Total | 950 | 1650 | 2550 |
Additional community tables
Table 6. Community 1.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Grass/Grasslike
|
||||||
| 1 | – | |||||
| basin wildrye | LECI4 | Leymus cinereus | 225–425 | – | ||
| needle and thread | HECO26 | Hesperostipa comata | 85–170 | – | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 85–170 | – | ||
| muttongrass | POFE | Poa fendleriana | 85–170 | – | ||
| western wheatgrass | PASM | Pascopyrum smithii | 85–170 | – | ||
| Grass, perennial | 2GP | Grass, perennial | 85–170 | – | ||
| Grass, annual | 2GA | Grass, annual | 85–170 | – | ||
| saline wildrye | LESAS | Leymus salinus ssp. salinus | 17–51 | – | ||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 17–51 | – | ||
| blue grama | BOGR2 | Bouteloua gracilis | 17–51 | – | ||
| James' galleta | PLJA | Pleuraphis jamesii | 17–51 | – | ||
| prairie Junegrass | KOMA | Koeleria macrantha | 17–51 | – | ||
| squirreltail | ELEL5 | Elymus elymoides | 17–51 | – | ||
| sand dropseed | SPCR | Sporobolus cryptandrus | 17–51 | – | ||
| Geyer's sedge | CAGE2 | Carex geyeri | 17–51 | – | ||
|
Forb
|
||||||
| 2 | – | |||||
| Forb, perennial | 2FP | Forb, perennial | 85–170 | – | ||
| Forb, annual | 2FA | Forb, annual | 85–170 | – | ||
| scarlet globemallow | SPCO | Sphaeralcea coccinea | 17–34 | – | ||
| mountain pepperweed | LEMO2 | Lepidium montanum | 17–34 | – | ||
| hoary tansyaster | MACA2 | Machaeranthera canescens | 17–34 | – | ||
| western tansymustard | DEPI | Descurainia pinnata | 17–34 | – | ||
| narrowleaf goosefoot | CHLE4 | Chenopodium leptophyllum | 17–34 | – | ||
| roughseed cryptantha | CRFL6 | Cryptantha flavoculata | 17–34 | – | ||
| white sagebrush | ARLU | Artemisia ludoviciana | 17–34 | – | ||
|
Shrub/Vine
|
||||||
| 3 | – | |||||
| basin big sagebrush | ARTRT | Artemisia tridentata ssp. tridentata | 225–340 | – | ||
| fourwing saltbush | ATCA2 | Atriplex canescens | 51–85 | – | ||
| Shrub (>.5m) | 2SHRUB | Shrub (>.5m) | 3–85 | – | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 17–51 | – | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 17–51 | – | ||
| prairie sagewort | ARFR4 | Artemisia frigida | 17–51 | – | ||
| longleaf brickellbush | BRLO | Brickellia longifolia | 17–51 | – | ||
| winterfat | KRLA2 | Krascheninnikovia lanata | 17–51 | – | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 17–51 | – | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 17–51 | – | ||
| mountain snowberry | SYOR2 | Symphoricarpos oreophilus | 17–51 | – | ||
| spiny hopsage | GRSP | Grayia spinosa | 17–51 | – | ||
Interpretations
Animal community
Livestock - This site provides proper grazing for cattle and sheep during all seasons of the year.
Wildlife - This site provides food and cover for wildlife. Wildlife using this site include jackrabbit, coyote, kangaroo rat, snake, hawk, and mule deer.
Recreational uses
Recreation activities are hiking and hunting.
Wood products
none
Supporting information
Contributors
J. Lee Broadbent
Approval
Kirt Walstad, 3/05/2022
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 | 05/23/2012 |
| Approved by | Kirt Walstad |
| Approval date | |
| Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
Rills are normally not present. Some very minor rill development may occur in sparsely vegetated areas. Any rills present should be less than 1/2 inch deep, widely spaced (15 to 20 feet), and not connected. They should average < 15 feet in length. A slight increase in rill development may also be observed following large storm events or spring runoff periods, but should heal within the next year. Rill development may also increase where the site is adjacent to other sites that produce large amounts of runoff (i.e. steeper sites, slickrock, etc.) -
Presence of water flow patterns:
None to very few. Any flow patterns present should be sinuous and wind around perennial plant bases. They may be long (15 to 25 feet), < 1 foot wide, and spaced from 10 to 20 feet apart. They should be stable with only minor evidence of deposition. This site is periodically inundated with runoff water from adjacent sites. It also acts as a filter and trap sediment. -
Number and height of erosional pedestals or terracettes:
Plants may show very minor pedestalling where they are adjacent to water flow patterns, but there should be no exposed roots. A few terracettes may be present. Where they are present, they should be stable and occur behind litter blocking water flow patterns. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
25 to 30% bare ground. Bare ground openings should not be greater that 1 foot in size and normally should not be connected. Poorly developed biological crusting that functions the same as bare ground, should be recorded as bare ground. -
Number of gullies and erosion associated with gullies:
None at site level. Widely scattered landscape level gully channels, however, are a normal component of desert environments. Where landscape gullies are present, they should be stable, partially vegetated on their sides and bottoms, with little evidence of head-cutting. Some slight increase in disturbance may be evident following significant weather events or when gullies convey considerable runoff from higher elevation rocky or naturally eroding areas. -
Extent of wind scoured, blowouts and/or depositional areas:
No evidence of wind generated soil movement. Wind scoured (blowouts) and depositional areas are not present. One to two inches of depositional mounding around basin big sagebrush and perennial grass clumps is normal for this site and is not caused by wind erosion. -
Amount of litter movement (describe size and distance expected to travel):
The majority of litter accumulates in place at the base of plant canopies. Slight movement of the finest material (< 1/8 inch) may move 1 to 2 feet in the direction of prevailing winds or downslope if being transported by water. Little accumulation is observed behind obstructions. -
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 5 to 6 under plant canopies and a rating of 4 to 5 in the interspaces. The average should be 5. Surface textures typically vary from sandy loams to loams. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
(Ohtog) Soil surface is typically 0 to 9 inches deep. Surface texture is a loam and structure is weak fine and medium subangular blocky. The A-horizon color is brown (7.5YR 5/4). Soils have an Ochric epipedon that extends 9 inches into the soil profile. The A horizon is normally deeper and better developed under plant canopies. 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:
Perennial vegetation breaks raindrop impact and reduces splash erosion. Good spatial distribution of plants slows runoff by obstructing surface flows, allowing time for increased infiltration. With the physiographic location of this site being in low lying areas, it often acts as a terminal accumulation site for runoff. The amount of sodium in the soil can reduce the infiltration and facilitate puddling on the surface. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None. This site will normally have textural changes within its' soil profile. These should not be mistaken for compaction layers. -
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:
Non-sprouting Shrubs (basin big sagebrush) >> Perennial Grasses (basin wildrye, needle-and-thread) > Perennial Forbs (scarlet globemallow).Sub-dominant:
Sprouting Shrubs (four-wing saltbush, rubber rabbitbrush > Rhizomatous Grasses (western wheatgrass) >> Perennial Forbs (narrowleaf goosefoot).Other:
Functional/structural groups may appropriately contain non-native species if their ecological function is the same as the native species in the reference state. Biological soil crust is variable in its' expression where present on this site and is measured as a component of ground cover. 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:
Disturbance regimes include insects, infrequent fire, and flooding. Temporal variability can be caused by fires, droughts, insects, etc. Spatial variability can be caused by runoff, soil pH, and topography. Following a recent disturbance such as fire, drought, or insect damage that remove woody vegetation, forbs and perennial grasses may dominate the community for a time. If a disturbance has not occurred for an extended period of time, woody species may continue to increase on the site, reducing herbaceous species. These conditions may reflect community phases within the reference state. -
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
There should be no mortality or decadence in either shrubs or grasses during years with average to above average precipitation. During severe (multi-year) droughts that affect groundwater levels, up to 10% of the perennial shrubs may die. Minor mortality of bunchgrasses may also occur during these drought periods. There may be partial mortality of individual bunchgrasses and shrubs during less severe droughts. -
Average percent litter cover (%) and depth ( in):
Litter cover ranges from 25 to 30%. Depth should be 1/4 inch thickness in the interspaces and from 1 to 1.5 inches under perennial plant canopies. -
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 1600 to 1700 pounds per acre on an average year. Production could vary from 900 to 2500 pounds per acre during drought or above-average years. -
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:
Russian thistle, halogeton, mustard species, filarie, other non-native annual forbs and cheatgrass. -
Perennial plant reproductive capability:
All perennial plants should have the ability to reproduce sexually or asexually in most years, except in drought years.
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The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.