Shallow Clayey (SwCy) 15-17” PZ
Scenario model
Current ecosystem state
Select a state
Management practices/drivers
Select a transition or restoration pathway
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Transition T1A
Excessive grazing without adequate recovery between grazing events or frequent and severe defoliation
More details -
Transition T2A
Long-term excessive grazing or frequent and severe defoliation without adequate recovery between grazing events or heavy, excessive grazing with overstocking
More details -
No transition or restoration pathway between the selected states has been described
Target ecosystem state
Select a state
Description
The Reference State is characterized by three distinct plant community phases: Reference, Increased Big Sagebrush, and Decreased Midgrasses Plant Community. The plant communities, and various successional stages between them, represent the natural range of variability within the Reference State.
Submodel
Description
This state is characterized by the Sod-bound Plant Community. An ecological threshold has been crossed and a significant amount of production and diversity has been lost when compared to the Reference State. Significant biotic and soil changes have negatively impacted energy flow and the nutrient and hydrologic cycles.
This is a very stable state, resistant to change due to the high tolerance of blue grama and/or buffalograss to grazing, the development of a shallow root system (root pan), and subsequent changes in hydrology and nutrient cycling. The loss of other functional/structural groups such as cool-season bunch and rhizomatous grasses, forbs, and shrubs, reduces the biodiversity and productivity of this site.
Submodel
Description
The Eroded State develops with long-term excessive grazing or frequent and severe defoliation, without adequate recovery between grazing events, heavy, excessive grazing with overstocking, will cause a shift across an ecological threshold to the Increased Bare Ground State.
An ecological threshold has been crossed. Erosion and loss of organic matter or carbon reserves are concerns.
Submodel
Mechanism
Transition 1.3 to 2: Excessive grazing without adequate recovery between grazing events or frequent and severe defoliation, will shift this plant community across an ecological threshold toward the Sod-Bound State. Biotic integrity and hydrologic function will be impaired because of this transition.
Mechanism
Long-term excessive grazing or frequent and severe defoliation without adequate recovery between grazing events or heavy, excessive grazing with overstocking, will cause a shift across an ecological threshold to the Eroded Ground State. Non-native annual bromes begin to invade in this transition.
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.