Wetland (WL) 10-17” 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 periods, 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 two distinct plant communities. 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 nature of the 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 nutrient and hydrologic cycles.
This is a very stable state, resistant to change due to the high tolerance of inland saltgrass 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 productivity of this site.
This alternative state should be tested through long-term observation of ecosystem behavior and repeated application of conservation and restoration practices. This state should be reevaluated and refined.
Submodel
Description
The Increased Bare Ground state develops with heavy, excessive grazing and/or excessive defoliation. An ecological threshold has been crossed. The Increased Bare Ground state denotes changes in infiltration, runoff, aggregate stability and species composition. The changes in water movement and the plant community affect changes in hydrologic functionality, biotic integrity, and soil and site stability. Infiltration, runoff, and soil erosion vary depending on the vegetation present. Erosion and loss of organic matter and carbon reserves are resource concerns. Desertification is advanced.
This alternative state should be tested and refined in future updates through long-term observation of ecosystem behavior, and repeated application of conservation and restoration practices.
Submodel
Mechanism
Excessive grazing without adequate recovery periods, 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 Increased Bare Ground state.
Erosion and loss of organic matter, along with invasion of introduced plants and noxious weeds, are resource concerns.
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.