Natural Resources
Conservation Service
Loamy 22+ PZ ARTRV/FEID-BRMA4
Scenario model
Current ecosystem state
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Management practices/drivers
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- Transition T1A More details
- Transition T1B More details
- Transition T2A More details
- Transition T2B More details
- Transition T3A More details
- Transition T3B More details
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No transition or restoration pathway between the selected states has been described
Target ecosystem state
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Submodel
Description
This plant community is dominated by annuals and some perennial forbs. Cheatgrass or bulbous bluegrass is dominant in the community, particularly at lower elevations. There may be a variety of invasive forbs and noxious species that have invaded the site. Some soil loss has occurred. The community has developed due to continued improper grazing management and frequent fire. This site has crossed the threshold. It is economically impractical to return this state to State 1 with accelerated practices.
Submodel
Description
This plant community is dominated by Utah juniper with annuals in the understory. There is a Utah juniper seed source in the proximity. Cheatgrass and bulbous bluegrass are dominant at lower elevations. There are few shrubs present due to competition from junipers. Some deep-rooted perennials may be present under the junipers. When shrub cover is below 12-13%, bare ground is above 27-28%, juniper cover is greater than 20%, and infiltration less than 6 cm/hr, the plant community has crossed the threshold. Some soil loss has occurred. This plant community has developed due to the continued lack of fire and improper grazing management. It is economically impractical to return this community to State 1 with accelerated practices.
Submodel
Description
This plant community is dominated by seeded species. The seeding may be introduced species or natives to mimic the Reference Plant Community Phase, Phase A.
Submodel
Description
This plant community has gone over the threshold to a new site. Site potential has been reduced. Significant soil loss has occurred. Infiltration has been reduced and run-off has become more rapid. This state has developed due to continued improper grazing management and no fire or frequent fires from State 2 or the continued absence of fire and improper grazing management from State 3 where the site is dominated by juniper. It is economically impractical to return this community to State 1 with accelerated practices.
Submodel
Mechanism
State 1 Phase C and D to State 2. Develops through improper grazing management and frequent fire. This site has crossed the threshold. It is economically impractical to return this state to State 1 with accelerated practices.
Mechanism
State 1, Phase B to 3. Develops with no fire and improper grazing management from a juniper invaded phase of State 1. This site has crossed the threshold. It is economically impractical to return State 3 to State 1 with accelerated practices.
Mechanism
Excessive soil loss and changes in the hydrologic cycle caused by improper grazing management and no fire or frequent fire cause this state to cross the threshold and retrogress to a new site with reduced potential. It is economically impractical to return this plant community to State 1 with accelerated practices.
Mechanism
Continued lack of fire or improper grazing management cause this state to cross the threshold and retrogress to a new site with reduced potential due to significant soil loss and changes in hydrology. It is economically impractical to return this plant community to State 1 with accelerated practices.
Model keys
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Ecological sites
Major Land Resource Areas
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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