GRAVELLY FAN APRON 5-7 PZ
Scenario model
Current ecosystem state
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Management practices/drivers
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- Transition T1 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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Description
The Reference State is representative of the natural range of variability under pristine conditions. Plant communities are dynamic in response to changes in disturbance regimes and weather patterns. Plant community phase changes are primarily driven by long-term drought, wildfire, disease and insect attack. This state is maintained by infrequent disturbances that allow native grasses to flourish while keeping the shrubs from dominating the site. Plant communities of the reference state are stable and long lived, both creosotebush and white bursage persist in the plant community even though their relative percentages may change over time.
Submodel
Description
The Invaded State is characterized by the presence of non-native annuals in the understory. Introduced annuals such as red brome and redstem filaree have invaded the reference plant community. A biotic threshold is crossed, with the introduction of non-native annuals that are difficult to remove from the system and have the potential to alter disturbance regimes significantly from their natural or historic range of variation. These non-natives annuals are highly flammable and promote wildfires where fires historically have been infrequent. The presence of non-natives has reduced the ecological resilience of the site.
Submodel
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.