Natural Resources
Conservation Service
Ecological site R028AY238UT
Semidesert Shallow Loam (Utah Juniper-Bluebunch Wheatgrass)
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.
Ecological site concept
The Semidesert Shallow Loam (Utah Juniper / Bluebunch Wheatgrass) ecological site is found on mountainsides and hillsides in the northern Great Salt Lake Area (MLRA D28A) at elevations between 4800 and 7000 feet. It occurs in the semidesert climate zone and recieves about 8-10 inches of annual precipitation. Plant growth relies on spring moisture in April and May, which is usually followed by hot, dry summers when most plants to go dormant. The soils are shallow and loamy with low water holding capacity. These soils typically formed in colluvium and residuum derived from limestone and/or sandstone. The reference plant community is dominated by Utah juniper, bluebunch wheatgrass, and often black sagebrush. Fire is the most common natural disturbance on this site. Cheatgrass and storksbill are common invaders of the understory, and cheatgrass is capable of dominating this site and altering the fire regime.
Associated sites
| R028AY215UT |
Semidesert Gravelly Loam (Wyoming Big Sagebrush) North |
|---|---|
| R028AY220UT |
Semidesert Loam (Wyoming Big Sagebrush) |
Similar sites
| R028AY232UT |
Semidesert Shallow Hardpan (Utah Juniper) |
|---|
Table 1. Dominant plant species
| Tree |
(1) Juniperus osteosperma |
|---|---|
| Shrub |
(1) Artemisia nova |
| Herbaceous |
(1) Pseudoroegneria spicata |
Physiographic features
This site is commonly found on mountainsides and hillsides, and may extend across ridges and fan pediments in some areas. It occurs on all aspects, and at elevations between 4800 and 7000 feet.
Table 2. Representative physiographic features
| Landforms |
(1)
Mountain slope
(2) Hill |
|---|---|
| Flooding frequency | None |
| Ponding frequency | None |
| Elevation | 4,800 – 7,000 ft |
| Slope | 10 – 70% |
| Aspect | Aspect is not a significant factor |
Climatic features
This site has a semiarid climate that is characterized by spring moisture, hot summers and cold winters. Precipitation is usually 8 to 10 inches, with April and May as the wettest months and July as the driest month during the growning season. Moisture becomes limiting to plant growth in June and throughout the remainder of the growing season. Plant growth begins about mid-March and continues until mid-June when plants mature or go dormant due to soil moisture depletion and high temperatures. Some of the grasses and forbs green up during the early fall due to increased precipitation and cooler temperatures.
Table 3. Representative climatic features
| Frost-free period (average) | 183 days |
|---|---|
| Freeze-free period (average) | 210 days |
| Precipitation total (average) | 10 in |
Figure 2. Monthly precipitation range
Figure 3. Monthly average minimum and maximum temperature
Influencing water features
Due to its landscape position, this site is not typically influenced by streams or wetlands.
Soil features
The soils of this site formed mostly in colluvium and residuum derived from limestone and sandstone. Soils are shallow to bedrock with loamy surface textures. Rock fragments may be abundant or completely absent on the soil surface and throughout the profile. High amounts of carbonates are common in these soils but are not present in all locations for this site. The soil moisture regime is xeric and the soil temperature regime is mesic. Total water holding capacity ranges from 1.1 to 1.9 inches of water. These soils are well to somewhat excessively drained with moderately slow to moderately rapid permeability.
Table 4. Representative soil features
| Parent material |
(1)
Colluvium
–
limestone
(2) Slope alluvium – limestone and sandstone |
|---|---|
| Surface texture |
(1) Very cobbly loam (2) Very stony sandy loam (3) Gravelly |
| Family particle size |
(1) Loamy |
| Drainage class | Well drained to somewhat excessively drained |
| Permeability class | Moderately slow to moderately rapid |
| Soil depth | 10 – 20 in |
| Surface fragment cover <=3" | 20% |
| Surface fragment cover >3" | 30% |
| Available water capacity (0-40in) |
1.1 – 1.9 in |
| Calcium carbonate equivalent (0-40in) |
40% |
| Electrical conductivity (0-40in) |
4 mmhos/cm |
| Sodium adsorption ratio (0-40in) |
10 |
| Soil reaction (1:1 water) (0-40in) |
7.4 – 9 |
| Subsurface fragment volume <=3" (Depth not specified) |
35% |
| Subsurface fragment volume >3" (Depth not specified) |
20% |
Ecological dynamics
State and transition model
Figure 4. 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
State 1 submodel, plant communities
State 2 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
State 1
Reference State
The reference state is characterized by mature stands of Utah juniper with an understory of bluebunch wheatgrass and black sagebrush. Fire, the most common natural disturbance on this site, removes juniper and most shrubs, while promoting bluebunch wheatgrass growth for several decades following fire. Non-sprouting shrubs and juniper increases slowly in the plant community after fire. Juniper regains overstory dominance after about 70 years (Barney and Frischknecht 1974).
Community 1.1
Juniper woodland / Bunchgrass
Figure 5. Phase 1.1
Figure 6. Phase 1.1 Landscape
The juniper woodland / bunchgrass community is characterized by scattered mature Utah junipers with an understory of bluebunch wheatgrass, black sagebrush, and other perennial grasses, shrubs, and forbs. Percent composition by air-dry weight is 30-65% grasses, 2-10% forbs, 15-35% shrubs and 15-35% trees. The overstory is composed of Utah juniper as the dominant woodland species with a few singleleaf or two-needle pinyon occurring on moister sites. The understory shrub layer is most commonly black sagebrush and shadscale, with yellow rabbitbrush, horsebrush, and various other shrubs occurring in different locations. Bluebunch wheatgrass is the primary component of the understory, with lesser amounts of Nevada bluegrass and Indian ricegrass commonly present. Scattered perennial forbs are diverse and species vary by location.
Figure 7. 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 | 200 | 300 | 400 |
| Shrub/Vine | 125 | 175 | 225 |
| Tree | 100 | 150 | 200 |
| Forb | 25 | 50 | 75 |
| Total | 450 | 675 | 900 |
Table 6. Ground cover
| Tree foliar cover | 5-15% |
|---|---|
| Shrub/vine/liana foliar cover | 10-15% |
| Grass/grasslike foliar cover | 5-15% |
| Forb foliar cover | 0-5% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 10-20% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 15-30% |
Table 7. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 0-5% | 0-5% |
| >0.5 <= 1 | 0% | 0-5% | 0-5% | 0-5% |
| >1 <= 2 | 0% | 5-20% | 5-15% | 0-5% |
| >2 <= 4.5 | 0% | – | – | – |
| >4.5 <= 13 | 5-15% | – | – | – |
| >13 <= 40 | 0-5% | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
Figure 8. Plant community growth curve (percent production by month). UT2381, PNC. Excellent Condition.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 5 | 15 | 40 | 30 | 5 | 5 | 0 | 0 | 0 | 0 |
Figure 9. Plant community growth curve (percent production by month). UT2382, Good Condition NO. 1. Bluegrass, Black Sagebrush.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 0 | 20 | 50 | 20 | 5 | 5 | 0 | 0 | 0 | 0 |
Community 1.2
Post-fire Grassland
Figure 10. Phase 1.2
Figure 11. Phase 1.2 landscape
The post-fire grassland community consists of bluebunch wheatgrass and other perennial grasses, forbs, and sometimes sprouting shrubs. Percent composition by air-dry weight is 70-95% grasses, 0-10% forbs, 0-15% shrubs and 0-10% trees. Some mature juniper trees may survive surface fires, but most are usually killed by fire, along with non-sprouting shrubs and forbs. Bluebunch wheatgrass responds most vigorously to the burn and dominates the site for 10-30 years before shrubs begin to increase. Utah juniper may increase slowly in this community phase, but normally does not regain dominance of the overstory until about 70 years following fire (Barney and Frischknecht 1974).
Figure 12. 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 | 375 | 450 | 525 |
| Shrub/Vine | 0 | 50 | 100 |
| Tree | 0 | 25 | 65 |
| Forb | 0 | 25 | 60 |
| Total | 375 | 550 | 750 |
Table 9. Ground cover
| Tree foliar cover | 0-5% |
|---|---|
| Shrub/vine/liana foliar cover | 0-5% |
| Grass/grasslike foliar cover | 20-35% |
| Forb foliar cover | 0-5% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 10-20% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 15-30% |
Table 10. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 0-5% | 0-5% |
| >0.5 <= 1 | 0% | 0-5% | 0-5% | 0-5% |
| >1 <= 2 | 0% | 0-5% | 15-30% | 0-5% |
| >2 <= 4.5 | 0-5% | – | 0-5% | – |
| >4.5 <= 13 | 0-5% | – | – | – |
| >13 <= 40 | – | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
Pathway 1.1a
Community 1.1 to 1.2
This pathway occurs when a crown or surface fire kills most or all of the trees and shrubs on the site. Perennial grasses respond to fire with vigorous growth and drive the ecological processes in phase 1.2 for several decades after the fire event.
Pathway 1.2a
Community 1.2 to 1.1
This pathway occurs gradually as Utah juniper trees mature and regain dominance after about 70 years without fire. This timeframe may be affected by the pre-fire plant community and seedbank, or by fire intensity and subsequent events (such as soil erosion from unusually heavy rainfall).
Conservation practices
| Firebreak | |
|---|---|
| Fuel Break |
State 2
Invaded State
The invaded state functions similarly to the reference state, but allows for the presence of non-native species.
Community 2.1
Juniper woodland / Bunchgrass
Figure 13. Phase 2.1
The juniper woodland / bunchgrass community is characterized by scattered mature Utah junipers with an understory of bluebunch wheatgrass, black sagebrush, and other perennial grasses, shrubs, and forbs. Invasive species, including cheatgrass, storksbill, halogeton, Russian thistle and others, are present but not dominant. Percent composition by air-dry weight is 30-65% grasses, 2-10% forbs, 15-35% shrubs and 15-35% trees. The overstory is composed of Utah juniper as the dominant woodland species with a few singleleaf or two-needle pinyon occurring on moister sites. The understory shrub layer is most commonly black sagebrush and shadscale, with yellow rabbitbrush, horsebrush, and various other shrubs occurring in some locations. Bluebunch wheatgrass is the primary component of the understory, with lesser amounts of Nevada bluegrass and Indian ricegrass commonly present. Scattered perennial forbs are diverse and species vary by location.
Figure 14. Annual production by plant type (representative values) or group (midpoint values)
Table 11. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 200 | 300 | 400 |
| Shrub/Vine | 125 | 175 | 225 |
| Tree | 100 | 150 | 200 |
| Forb | 25 | 50 | 75 |
| Total | 450 | 675 | 900 |
Table 12. Ground cover
| Tree foliar cover | 5-15% |
|---|---|
| Shrub/vine/liana foliar cover | 10-15% |
| Grass/grasslike foliar cover | 5-15% |
| Forb foliar cover | 0-5% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 10-20% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 15-30% |
Table 13. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 0-5% | 0-5% |
| >0.5 <= 1 | 0% | 0-5% | 0-5% | 0-5% |
| >1 <= 2 | 0% | 5-20% | 5-15% | 0-5% |
| >2 <= 4.5 | 0% | – | – | – |
| >4.5 <= 13 | 5-15% | – | – | – |
| >13 <= 40 | 0-5% | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
Figure 15. Plant community growth curve (percent production by month). UT2381, PNC. Excellent Condition.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 5 | 15 | 40 | 30 | 5 | 5 | 0 | 0 | 0 | 0 |
Figure 16. Plant community growth curve (percent production by month). UT2382, Good Condition NO. 1. Bluegrass, Black Sagebrush.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| J | F | M | A | M | J | J | A | S | O | N | D |
| 0 | 0 | 0 | 20 | 50 | 20 | 5 | 5 | 0 | 0 | 0 | 0 |
Community 2.2
Post-fire Grassland
Figure 17. Phase 2.2
The post-fire grassland community consists of bluebunch wheatgrass and other perennial grasses, forbs, and sometimes sprouting shrubs. Percent composition by air-dry weight is 70-95% grasses, 0-10% forbs, 0-15% shrubs and 0-10% trees. Invasive species are present but not dominant. Some mature juniper trees may survive surface fires, but most are usually killed by fire, along with non-sprouting shrubs and forbs. Bluebunch wheatgrass responds most vigorously to the burn and dominates the site for 10-30 years before shrubs begin to increase. Utah juniper may increase slowly in this community phase, but normally does not regain dominance of the overstory until about 70 years following fire (Barney and Frischknecht 1974).
Figure 18. Annual production by plant type (representative values) or group (midpoint values)
Table 14. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 375 | 450 | 525 |
| Shrub/Vine | 0 | 50 | 100 |
| Tree | 0 | 25 | 65 |
| Forb | 0 | 25 | 60 |
| Total | 375 | 550 | 750 |
Table 15. Ground cover
| Tree foliar cover | 0-5% |
|---|---|
| Shrub/vine/liana foliar cover | 0-5% |
| Grass/grasslike foliar cover | 20-35% |
| Forb foliar cover | 0-5% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 10-20% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 15-30% |
Table 16. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 0-5% | 0-5% |
| >0.5 <= 1 | 0% | 0-5% | 0-5% | 0-5% |
| >1 <= 2 | 0% | 0-5% | 15-30% | 0-5% |
| >2 <= 4.5 | 0-5% | – | 0-5% | – |
| >4.5 <= 13 | 0-5% | – | – | – |
| >13 <= 40 | – | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
Community 2.3
At-risk, Increasing Invasives
Figure 19. Phase 2.3 At-Risk
This community phase is characterized by the co-dominance of invasive annual species with perennial grasses in the understory. It is at-risk of transitioning to states 3 and 4, which are dominated by invasive annuals. When perennial grass vigor is reduced, resources become available for invasive annual species. The presence of invasive species in the plant community provides a seed source, and invasive species increase to the point that the plant community becomes at-risk of losing the perennial grasses. Reduced perennial grass vigor is often the result of improper grazing and/or disturbance (such as fire, mechanical treatment, etc).
Figure 20. Annual production by plant type (representative values) or group (midpoint values)
Table 17. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 200 | 300 | 400 |
| Shrub/Vine | 125 | 175 | 225 |
| Tree | 100 | 150 | 200 |
| Forb | 25 | 50 | 75 |
| Total | 450 | 675 | 900 |
Table 18. Ground cover
| Tree foliar cover | 5-15% |
|---|---|
| Shrub/vine/liana foliar cover | 10-15% |
| Grass/grasslike foliar cover | 5-15% |
| Forb foliar cover | 0-5% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 10-20% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 15-30% |
Table 19. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 0-5% | 0-5% |
| >0.5 <= 1 | 0% | 0-5% | 0-5% | 0-5% |
| >1 <= 2 | 0% | 5-20% | 5-15% | 0-5% |
| >2 <= 4.5 | 0% | – | – | – |
| >4.5 <= 13 | 5-15% | – | – | – |
| >13 <= 40 | 0-5% | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
Pathway 2.1a
Community 2.1 to 2.2
This pathway occurs when a crown or surface fire kills most or all of the trees and shrubs on the site. Perennial grasses respond to fire with vigorous growth and drive the ecological processes in phase 1.2 for several decades after the fire event. Mechanical or chemical removal of shrubs and trees are not documented for this site. However, they are not expected to result in vigorous growth of perennial grasses as compared to fire. Mechanical and chemical removal of woody species leaves many nutrients tied up in woody debris, and may cause a different response in the plant community than fire. An increase in invasive species often occurs with disturbance in the invaded state due to the presence of invasive species seed in the seedbank that take advantage of resources made available by disturbance.
Conservation practices
| Brush Management | |
|---|---|
| Prescribed Burning | |
| Grazing Land Mechanical Treatment |
Pathway 2.1b
Community 2.1 to 2.3
This pathway occurs when invasive annual species increase due to the reduction in vigor of perennial grasses. Improper grazing and/or disturbance (fire, mechanical treatments, etc.) drive this communtiy pathway.
Pathway 2.2a
Community 2.2 to 2.1
This pathway occurs gradually as Utah juniper trees mature and regain dominance after about 70 years without fire. This timeframe may be affected by the pre-fire plant community and seedbank, or by fire intensity and subsequent events (such as soil erosion from unusually heavy rainfall).
Conservation practices
| Firebreak | |
|---|---|
| Fuel Break |
Pathway 2.2b
Community 2.2 to 2.3
This pathway occurs when invasive annual species increase due to the reduction in vigor of perennial grasses. Shrubs and Utah juniper also increase. Improper grazing and/or disturbance (excluding fire) drive this community pathway.
State 3
Utah Juniper / Annual Understory
This state retains juniper dominance in the overstory, but is dominated by invasive annual species in the understory. Production is greatly reduced and limited to a few weeks in April and early May. This state is not resistant or resillient against further degradation to state 4, in which the juniper overstory is lost.
Community 3.1
Invasive-dominant Understory
This community phase is characterized by the dominance of invasive annual species in the understory and Utah juniper in the overstory. It is at-risk of transitioning to state 4, which is dominated by invasive annuals without a juniper overstory. Composition by air-dry weight is 0-10% perennial grasses, 30-40% annual grasses, 10-20% forbs, 15-30% shrubs, and 15-40% Utah juniper.
Figure 21. Annual production by plant type (representative values) or group (midpoint values)
Table 20. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 100 | 200 | 300 |
| Tree | 100 | 150 | 200 |
| Shrub/Vine | 75 | 125 | 175 |
| Forb | 50 | 75 | 100 |
| Total | 325 | 550 | 775 |
Table 21. Ground cover
| Tree foliar cover | 5-15% |
|---|---|
| Shrub/vine/liana foliar cover | 2-10% |
| Grass/grasslike foliar cover | 5-25% |
| Forb foliar cover | 2-20% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 15-30% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 10-20% |
Table 22. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 5-15% | 5-15% |
| >0.5 <= 1 | 0% | 0-5% | 10-20% | 5-15% |
| >1 <= 2 | 0% | 0-10% | 0-5% | 0-5% |
| >2 <= 4.5 | 0% | – | – | – |
| >4.5 <= 13 | 5-15% | – | – | – |
| >13 <= 40 | 0-5% | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
State 4
Annual Dominance
This state is dominated by invasive annuals, primarily cheatgrass, which increases the fire frequency to every several years (as opposed to decades or centuries). The fire frequency precludes woody species from ragaining dominance on the site, and the resource pulses favor annual species. There is currently no transition or restoration pathway out of this state.
Community 4.1
Invasive-dominant Understory
Figure 22. Phase 4.1
This community phase is characterized by the dominance of invasive annual species in the understory and the general lack of native woody and herbaceous species. Total production is greatly reduced due to the loss of all functional/structural groups besides annual grasses and forbs. Composition by air-dry weight is 0-10% perennial grasses, 60-85% annual grasses, 10-25% forbs, 0-10% shrubs, and 0-5% Utah juniper.
Figure 23. Annual production by plant type (representative values) or group (midpoint values)
Table 23. Annual production by plant type
| Plant type | Low (lb/acre) |
Representative value (lb/acre) |
High (lb/acre) |
|---|---|---|---|
| Grass/Grasslike | 100 | 250 | 450 |
| Shrub/Vine | 5 | 50 | 100 |
| Forb | 50 | 75 | 100 |
| Tree | 0 | 20 | 40 |
| Total | 155 | 395 | 690 |
Table 24. Ground cover
| Tree foliar cover | 0-2% |
|---|---|
| Shrub/vine/liana foliar cover | 0-5% |
| Grass/grasslike foliar cover | 20-35% |
| Forb foliar cover | 2-25% |
| Non-vascular plants | 0% |
| Biological crusts | 0% |
| Litter | 15-30% |
| Surface fragments >0.25" and <=3" | 0-20% |
| Surface fragments >3" | 0-30% |
| Bedrock | 0-5% |
| Water | 0% |
| Bare ground | 10-30% |
Table 25. Canopy structure (% cover)
| Height Above Ground (ft) | Tree | Shrub/Vine | Grass/ Grasslike |
Forb |
|---|---|---|---|---|
| <0.5 | 0% | 0% | 5-15% | 5-20% |
| >0.5 <= 1 | 0% | 0-5% | 15-30% | 5-20% |
| >1 <= 2 | 0% | 0-5% | 0-5% | 0-5% |
| >2 <= 4.5 | 0% | – | – | – |
| >4.5 <= 13 | 0-2% | – | – | – |
| >13 <= 40 | 0-2% | – | – | – |
| >40 <= 80 | – | – | – | – |
| >80 <= 120 | – | – | – | – |
| >120 | – | – | – | – |
Transition T1a
State 1 to 2
This transition occurs when invasive species establish on the site. Establishment of invasive species provides a seed source that decreases the resillience of the site following natural or human disturbance.
Transition T2a
State 2 to 3
This transition occurs when invasive annual species, such as cheatgrass and storksbill, become dominant in the understory, while Utah juniper remains dominant in the overstory. Some perennial grasses may be present but not dominant. Improper grazing that further reduces the vigor of perennial grasses during the growing season can drive this transition.
Transition T2b
State 2 to 4
This transition occurs when fire or other disturbance removes the woody species and frees up resources for invasive annuals, such as cheatgrass and storksbill. Invasive annuals now dominate the site and drive the ecological processes in their own favor, and to the exclusion of native species. Perennial grasses may be present but not dominant. The fire return interval is expected to be reduced to every few years, instead of several decades or centuries.
Transition T3a
State 3 to 4
This transition occurs when fire or other disturbance removes woody species and frees up resources for invasive annual species to thrive. Juniper and other woody species are not able to regain dominance in the community due to increased fire frequency following this transition.
Additional community tables
Table 26. Community 1.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 100–200 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 100–200 | 5–15 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–20 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–20 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 125–225 | ||||
| black sagebrush | ARNO4 | Artemisia nova | 50–125 | 5–15 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 5–50 | 0–3 | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 5–50 | 0–3 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–50 | 0–3 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–30 | 0–2 | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–30 | 0–2 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–30 | 0–2 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–30 | 0–2 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 180–400 | ||||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 160–360 | 8–15 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 10–50 | 1–3 | ||
| Sandberg bluegrass | POSE | Poa secunda | 10–50 | 1–3 | ||
| 1 | Secondary Grasses | 0–35 | ||||
| purple threeawn | ARPU9 | Aristida purpurea | 0–20 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–20 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–20 | 0–2 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–20 | 0–2 | ||
| western wheatgrass | PASM | Pascopyrum smithii | 0–20 | 0–2 | ||
| James' galleta | PLJA | Pleuraphis jamesii | 0–20 | 0–2 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 25–75 | ||||
| desert princesplume | STPI | Stanleya pinnata | 0–35 | 0–3 | ||
| aster | ASTER | Aster | 0–20 | 0–2 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–20 | 0–2 | ||
| cryptantha | CRYPT | Cryptantha | 0–20 | 0–2 | ||
| fleabane | ERIGE2 | Erigeron | 0–20 | 0–2 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–20 | 0–2 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–20 | 0–2 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–20 | 0–2 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–2 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–15 | 0–2 | ||
Table 27. Community 1.2 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 0–65 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 0–65 | 0–4 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–10 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–10 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 0–100 | ||||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–50 | 0–4 | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 0–50 | 0–3 | ||
| black sagebrush | ARNO4 | Artemisia nova | 0–50 | 0–3 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–50 | 0–3 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 0–30 | 0–2 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–30 | 0–2 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–30 | 0–2 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–30 | 0–2 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 375–525 | ||||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 300–500 | 15–20 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 10–75 | 1–5 | ||
| Sandberg bluegrass | POSE | Poa secunda | 10–75 | 1–5 | ||
| 1 | Secondary Grasses | 0–75 | ||||
| purple threeawn | ARPU9 | Aristida purpurea | 0–40 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–40 | 0–2 | ||
| James' galleta | PLJA | Pleuraphis jamesii | 0–40 | 0–2 | ||
| western wheatgrass | PASM | Pascopyrum smithii | 0–30 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–30 | 0–2 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–30 | 0–2 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 0–60 | ||||
| desert princesplume | STPI | Stanleya pinnata | 0–35 | 0–3 | ||
| aster | ASTER | Aster | 0–20 | 0–2 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–20 | 0–2 | ||
| cryptantha | CRYPT | Cryptantha | 0–20 | 0–2 | ||
| fleabane | ERIGE2 | Erigeron | 0–20 | 0–2 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–20 | 0–2 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–20 | 0–2 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–20 | 0–2 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–2 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–15 | 0–2 | ||
Table 28. Community 2.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 100–200 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 100–200 | 5–15 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–20 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–20 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 125–225 | ||||
| black sagebrush | ARNO4 | Artemisia nova | 50–125 | 5–15 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 5–50 | 0–3 | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 5–50 | 0–3 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–50 | 0–3 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–30 | 0–2 | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–30 | 0–2 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–30 | 0–2 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–30 | 0–2 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 180–400 | ||||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 160–360 | 8–15 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 10–50 | 1–3 | ||
| Sandberg bluegrass | POSE | Poa secunda | 10–50 | 1–3 | ||
| cheatgrass | BRTE | Bromus tectorum | 1–25 | 0–2 | ||
| 1 | Secondary Grasses | 0–35 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 0–20 | 0–2 | ||
| James' galleta | PLJA | Pleuraphis jamesii | 0–20 | 0–2 | ||
| purple threeawn | ARPU9 | Aristida purpurea | 0–20 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–20 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–20 | 0–2 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–20 | 0–2 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 25–75 | ||||
| desert princesplume | STPI | Stanleya pinnata | 0–35 | 0–3 | ||
| Russian thistle | SAKA | Salsola kali | 0–25 | 0–2 | ||
| tall tumblemustard | SIAL2 | Sisymbrium altissimum | 0–25 | 0–2 | ||
| redstem stork's bill | ERCI6 | Erodium cicutarium | 0–25 | 0–2 | ||
| saltlover | HAGL | Halogeton glomeratus | 0–25 | 0–2 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–20 | 0–2 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–20 | 0–2 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–2 | ||
| fleabane | ERIGE2 | Erigeron | 0–20 | 0–2 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–20 | 0–2 | ||
| aster | ASTER | Aster | 0–20 | 0–2 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–20 | 0–2 | ||
| cryptantha | CRYPT | Cryptantha | 0–20 | 0–2 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–15 | 0–2 | ||
Table 29. Community 2.2 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 0–65 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 0–65 | 0–4 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–10 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–10 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 0–100 | ||||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–50 | 0–4 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–50 | 0–3 | ||
| black sagebrush | ARNO4 | Artemisia nova | 0–50 | 0–3 | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 0–50 | 0–3 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–30 | 0–2 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 0–30 | 0–2 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–30 | 0–2 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–30 | 0–2 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 375–525 | ||||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 300–500 | 15–20 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 10–75 | 1–5 | ||
| Sandberg bluegrass | POSE | Poa secunda | 10–75 | 1–5 | ||
| cheatgrass | BRTE | Bromus tectorum | 1–50 | 0–3 | ||
| 1 | Secondary Grasses | 0–75 | ||||
| James' galleta | PLJA | Pleuraphis jamesii | 0–40 | 0–2 | ||
| purple threeawn | ARPU9 | Aristida purpurea | 0–40 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–40 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–30 | 0–2 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–30 | 0–2 | ||
| western wheatgrass | PASM | Pascopyrum smithii | 0–30 | 0–2 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 0–60 | ||||
| redstem stork's bill | ERCI6 | Erodium cicutarium | 0–50 | 0–4 | ||
| desert princesplume | STPI | Stanleya pinnata | 0–35 | 0–3 | ||
| Russian thistle | SAKA | Salsola kali | 0–25 | 0–2 | ||
| tall tumblemustard | SIAL2 | Sisymbrium altissimum | 0–25 | 0–2 | ||
| saltlover | HAGL | Halogeton glomeratus | 0–25 | 0–2 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–20 | 0–2 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–20 | 0–2 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–2 | ||
| fleabane | ERIGE2 | Erigeron | 0–20 | 0–2 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–20 | 0–2 | ||
| aster | ASTER | Aster | 0–20 | 0–2 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–20 | 0–2 | ||
| cryptantha | CRYPT | Cryptantha | 0–20 | 0–2 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–15 | 0–2 | ||
Table 30. Community 2.3 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 100–200 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 100–200 | 5–15 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–20 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–20 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 125–225 | ||||
| black sagebrush | ARNO4 | Artemisia nova | 50–125 | 5–15 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 5–50 | 0–3 | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 5–50 | 0–3 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–50 | 0–3 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–30 | 0–2 | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–30 | 0–2 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–30 | 0–2 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–30 | 0–2 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 180–400 | ||||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 80–180 | 4–8 | ||
| cheatgrass | BRTE | Bromus tectorum | 80–180 | 0–2 | ||
| Sandberg bluegrass | POSE | Poa secunda | 10–50 | 1–3 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 10–50 | 1–3 | ||
| 1 | Secondary Grasses | 0–35 | ||||
| western wheatgrass | PASM | Pascopyrum smithii | 0–20 | 0–2 | ||
| James' galleta | PLJA | Pleuraphis jamesii | 0–20 | 0–2 | ||
| purple threeawn | ARPU9 | Aristida purpurea | 0–20 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–20 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–20 | 0–2 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–20 | 0–2 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 25–75 | ||||
| desert princesplume | STPI | Stanleya pinnata | 0–35 | 0–3 | ||
| Russian thistle | SAKA | Salsola kali | 0–25 | 0–2 | ||
| tall tumblemustard | SIAL2 | Sisymbrium altissimum | 0–25 | 0–2 | ||
| redstem stork's bill | ERCI6 | Erodium cicutarium | 0–25 | 0–2 | ||
| saltlover | HAGL | Halogeton glomeratus | 0–25 | 0–2 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–20 | 0–2 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–20 | 0–2 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–2 | ||
| fleabane | ERIGE2 | Erigeron | 0–20 | 0–2 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–20 | 0–2 | ||
| aster | ASTER | Aster | 0–20 | 0–2 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–20 | 0–2 | ||
| cryptantha | CRYPT | Cryptantha | 0–20 | 0–2 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–15 | 0–2 | ||
Table 31. Community 3.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 100–200 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 100–200 | 5–15 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–20 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–20 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 75–175 | ||||
| black sagebrush | ARNO4 | Artemisia nova | 50–125 | 5–15 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 5–50 | 0–3 | ||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 5–50 | 0–3 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–50 | 0–3 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–30 | 0–2 | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–30 | 0–2 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–30 | 0–2 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–30 | 0–2 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 100–300 | ||||
| cheatgrass | BRTE | Bromus tectorum | 90–290 | 5–25 | ||
| Sandberg bluegrass | POSE | Poa secunda | 10–50 | 1–3 | ||
| 1 | Secondary Grasses | 0–25 | ||||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 0–25 | 0–2 | ||
| James' galleta | PLJA | Pleuraphis jamesii | 0–20 | 0–2 | ||
| purple threeawn | ARPU9 | Aristida purpurea | 0–20 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–20 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–10 | 0–1 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–10 | 0–1 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 0–10 | 0–1 | ||
| western wheatgrass | PASM | Pascopyrum smithii | 0–1 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 50–100 | ||||
| redstem stork's bill | ERCI6 | Erodium cicutarium | 0–100 | 0–8 | ||
| Russian thistle | SAKA | Salsola kali | 0–75 | 0–6 | ||
| tall tumblemustard | SIAL2 | Sisymbrium altissimum | 0–50 | 0–4 | ||
| saltlover | HAGL | Halogeton glomeratus | 0–50 | 0–4 | ||
| desert princesplume | STPI | Stanleya pinnata | 0–35 | 0–3 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–20 | 0–2 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–20 | 0–2 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–20 | 0–2 | ||
| fleabane | ERIGE2 | Erigeron | 0–20 | 0–2 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–20 | 0–2 | ||
| aster | ASTER | Aster | 0–20 | 0–2 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–20 | 0–2 | ||
| cryptantha | CRYPT | Cryptantha | 0–20 | 0–2 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–15 | 0–2 | ||
Table 32. Community 4.1 plant community composition
| Group | Common name | Symbol | Scientific name | Annual production (lb/acre) | Foliar cover (%) | |
|---|---|---|---|---|---|---|
|
Tree
|
||||||
| 1 | Trees | 0–40 | ||||
| Utah juniper | JUOS | Juniperus osteosperma | 0–40 | 0–2 | ||
| twoneedle pinyon | PIED | Pinus edulis | 0–10 | 0–1 | ||
| singleleaf pinyon | PIMO | Pinus monophylla | 0–10 | 0–1 | ||
|
Shrub/Vine
|
||||||
| 2 | Shrubs | 5–100 | ||||
| yellow rabbitbrush | CHVI8 | Chrysothamnus viscidiflorus | 0–100 | 0–8 | ||
| rubber rabbitbrush | ERNA10 | Ericameria nauseosa | 0–100 | 0–8 | ||
| broom snakeweed | GUSA2 | Gutierrezia sarothrae | 0–100 | 0–8 | ||
| shortspine horsebrush | TESP2 | Tetradymia spinosa | 0–75 | 0–5 | ||
| plains pricklypear | OPPO | Opuntia polyacantha | 0–50 | 0–4 | ||
| spineless horsebrush | TECA2 | Tetradymia canescens | 0–50 | 0–4 | ||
| black sagebrush | ARNO4 | Artemisia nova | 0–10 | 0–1 | ||
| shadscale saltbush | ATCO | Atriplex confertifolia | 0–10 | 0–1 | ||
|
Grass/Grasslike
|
||||||
| 3 | Primary Grasses | 100–400 | ||||
| cheatgrass | BRTE | Bromus tectorum | 100–400 | 10–30 | ||
| 1 | Secondary Grasses | 0–50 | ||||
| Sandberg bluegrass | POSE | Poa secunda | 0–40 | 0–3 | ||
| bluebunch wheatgrass | PSSP6 | Pseudoroegneria spicata | 0–25 | 0–2 | ||
| purple threeawn | ARPU9 | Aristida purpurea | 0–20 | 0–2 | ||
| blue grama | BOGR2 | Bouteloua gracilis | 0–20 | 0–2 | ||
| James' galleta | PLJA | Pleuraphis jamesii | 0–20 | 0–2 | ||
| squirreltail | ELEL5 | Elymus elymoides | 0–10 | 0–1 | ||
| needle and thread | HECO26 | Hesperostipa comata | 0–10 | 0–1 | ||
| basin wildrye | LECI4 | Leymus cinereus | 0–10 | 0–1 | ||
| Indian ricegrass | ACHY | Achnatherum hymenoides | 0–10 | 0–1 | ||
| western wheatgrass | PASM | Pascopyrum smithii | 0–1 | 0–1 | ||
|
Forb
|
||||||
| 2 | Forbs | 50–100 | ||||
| redstem stork's bill | ERCI6 | Erodium cicutarium | 0–100 | 0–8 | ||
| Russian thistle | SAKA | Salsola kali | 0–75 | 0–6 | ||
| tall tumblemustard | SIAL2 | Sisymbrium altissimum | 0–75 | 0–6 | ||
| saltlover | HAGL | Halogeton glomeratus | 0–50 | 0–4 | ||
| gooseberryleaf globemallow | SPGR2 | Sphaeralcea grossulariifolia | 0–20 | 0–2 | ||
| desert princesplume | STPI | Stanleya pinnata | 0–10 | 0–1 | ||
| fleabane | ERIGE2 | Erigeron | 0–10 | 0–1 | ||
| cushion buckwheat | EROV | Eriogonum ovalifolium | 0–10 | 0–1 | ||
| ballhead ipomopsis | IPCOC3 | Ipomopsis congesta ssp. congesta | 0–10 | 0–1 | ||
| Chambers' twinpod | PHCH2 | Physaria chambersii | 0–10 | 0–1 | ||
| spiny phlox | PHHO | Phlox hoodii | 0–10 | 0–1 | ||
| browse milkvetch | ASCI2 | Astragalus cibarius | 0–10 | 0–1 | ||
| aster | ASTER | Aster | 0–10 | 0–1 | ||
| Hooker's balsamroot | BAHO | Balsamorhiza hookeri | 0–10 | 0–1 | ||
| cryptantha | CRYPT | Cryptantha | 0–10 | 0–1 | ||
Interpretations
Animal community
Approximately 40 percent of the plants furnish some forage for livestock. Limited numbers of plant species occur, but they have enough variety to provide balanced nutrition for cattle, horses, and sheep. Grazing can be during all seasons, but best efficiency is in the fall or winter. Spring grazing is a common practice.
Wildlife using this site include antelope, blacktailed jackrabbit, coyote, morning dove, golden eagles (fall and spring), a few songbirds, and a few species of small mammals.
This is a short list of the more common species found. Many other species are present as well and migratory birds are present at times.
Hydrological functions
The soil series is in hydrologic group D. The hydrologic curve number is 80 when the vegetation is in good condition.
Recreational uses
Values are fair for camping, hiking, and picnicking.
Wood products
This site yields approximately three cords of juniper per acre for firewood.
Other information
Threatened and endangered species include plants and animals.
Supporting information
Type locality
| Location 1: Box Elder County, UT | |
|---|---|
| General legal description | Warm Springs Hill 15 Miles west of Park Valley |
Other references
Barney, Milo A.; Frischknecht, Neil C. 1974. Vegetation changes following fire in the pinyon-juniper type of west-central Utah. Journal of Range Management. 27(2): 91-96. [397]
Contributors
GR DJS
GR, David J. Somerville
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) |
Jack Alexander, Range Specialist, Synergy Resource Solutions, Inc. Julia Kluck, Soil Scientist, Synergy Resource Solutions, Inc. Shane Green, State Range Specialist, Utah NRCS |
|---|---|
| Contact for lead author | Shane Green, Shane.Green@ut.usda.gov |
| Date | 02/09/2010 |
| Approved by | Shane A. Green |
| Approval date | |
| Composition (Indicators 10 and 12) based on | Annual Production |
Indicators
-
Number and extent of rills:
Some rills present. Rill development may increase following large storm events, but should begin to heal during the following growing season. Frost heaving will accelerate recovery. Rill development may increase when run inflow enters site from other sites that produce large amounts of runoff (i.e. steeper sites, slickrock, rock outcrop). -
Presence of water flow patterns:
Water flow patterns will be short (2-5’) and meandering; interrupted by plants and exposed rocks. Some evidence of erosion or deposition associated with flow patterns. Where slopes exceed 5%, water flow patterns may be longer (5–10’). -
Number and height of erosional pedestals or terracettes:
Plants may have small pedestals (1-3”) where they are adjacent to water flow patterns, but without exposed roots. Terracettes should be few and stable. Terracettes should be small (1-3”) and show little sign of active erosion. Some plants may appear to have a pedestal but rather than be formed by erosion, the only place litter accumulates and soil collects is at plant bases forming the appearance of a pedestal.
Well-developed biological crusts may appear pedestalled, but are actually a characteristic of the crust formation. Some plants may appear to have a pedestal but rather than be formed by erosion, the only place litter accumulates and soil collects is at plant bases forming the appearance of a pedestal. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
20-40% bare ground (soil with no protection from raindrop impact). Herbaceous communities are most likely to have lower values. As species composition by shrubs increases, bare ground is likely to increase. Poorly developed biological soil crust that is susceptible to raindrop splash erosion should be recorded as bare ground. Very few if any bare spaces of greater than 1 square foot. -
Number of gullies and erosion associated with gullies:
No gullies present. -
Extent of wind scoured, blowouts and/or depositional areas:
Very minor evidence of active wind-generated soil movement. Wind scoured (blowouts) and depositional areas are rarely present. If present they have muted features and are mostly stabilized with vegetation and/or biological crust. Gravel or desert pavement protects the site from wind scour. -
Amount of litter movement (describe size and distance expected to travel):
Most litter resides in place with some redistribution caused by water and wind movement. Very minor litter removal may occur in flow patterns and rills with deposition occurring at points of obstruction. The majority of litter accumulates at the base of plants. Some leaves, stems, and small twigs may accumulate in soil depressions adjacent to plants. Woody stems are not likely to move. On steep slopes (>30%), litter will move downhill to next obstruction. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
This site should have an erosion rating of 5 or 6 under plant canopies and a rating of 4 to 5 in the interspaces with an average rating of 5 using the soil stability kit test. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
This description is based on the modal soil (Amtoft Family CBV-L, soil survey area: 611, Tooele), the only soil correlated with this site.
Soil surface horizon is typically 8 inches deep. Structure is typically weak medium subungular blocky. Color is typically pale brown (10YR 6/3), brown (10YR 4/3) moist. An ochric horizon extends to a depth of 8 inches. An ochric horizon typically extends to a depth of 2 to 10 inches. The ochric horizon is a surface horizon lacking fine stratification and which is either light colored, or thin, or has an low organic carbon content, or is massive and (very) hard when dry. The A horizon would be expected to be more strongly developed under plant canopies. It is important if you are sampling to observe the A horizon under plant canopies as well as the interspaces.
-
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Vascular plants and any well-developed biological soil crusts (where present) will break raindrop impact and splash erosion. Spatial distribution of vascular plants and interspaces between well-developed biological soil crusts (where present) provide detention storage and surface roughness that slows runoff allowing time for infiltration. Crowns of trees and accumulating litter at base of trees appear to create a micro-topography that may enhance development of water flow patterns below the drip line of the canopy. Significant increases in pinyon-juniper canopy reduces understory vegetation and increases runoff. -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None. Lithic contact (the boundary with hard bedrock) may occur at about 17 inches. Naturally occurring soil horizons may be harder than the surface because of an accumulation of calcium carbonate and should not be considered as 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:
Utah juniper > bluebunch wheatgrass, black sagebrushSub-dominant:
Indian ricegrass, shadscale saltbushOther:
other shrubs, other grasses, forbsAdditional:
In the northern portion of the MLRA cool-season perennial grasses (Indian ricegrass, needle and thread) dominate. In the southernmost portion of the MLRA warm-season perennial grasses (galleta, sand dropseed) dominate. The two groups share dominance in the middle portion of the MLRA. -
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
During years with average to above average precipitation, there should be very little recent mortality or decadence apparent in either the shrubs or grasses. Some bunchgrass and shrub mortality may occur during severe droughts, particularly on the shallower and coarser soils associated with this site. -
Average percent litter cover (%) and depth ( in):
Litter cover includes litter under plants. Most litter will be fine litter. Depth should be 1-2 leaf thickness in the interspaces and up to 1/2” under canopies. Litter cover may increase to 20-30% following years with favorable growing conditions. Excess litter may accumulate in absence of disturbance. Vegetative production may be reduced if litter cover exceeds 40%. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
650#/acre.
Even the most stable communities exhibit a range of production values. Production will vary between communities and across the MRLA. Refer to the community descriptions in the ESD. Production will differ across the MLRA due to the naturally occurring variability in weather, soils, and aspect. The biological processes on this site are complex; therefore, representative values are presented in a land management context. -
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, green rabbitbrush, annual forbs, broom snakeweed, Utah juniper, purple threeawn, medusahead rye. -
Perennial plant reproductive capability:
All perennial plants should have the ability to reproduce sexually or asexually, except in drought years. Density of plants indicates that plants reproduce at level sufficient to fill available resource. Within capability of site there are no restrictions on seed or vegetative reproductive capacity.
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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.
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