Shallow To Moderately Deep Petrocalcic Fan Remnants (Provisional)
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
This state represents the natural range of variability for this ecological site, pre-European settlement. This state no longer exists due to the naturalization of non-native species, and data for this state does not exist. This state had infrequent fire, only native species, and no livestock grazing. Fluctuations in annual productivity would have occurred with climatic variability.
Submodel
Description
This is the representative state for this ecological site. It is similar in composition to the reference state, but non-native species are present, perennial grasses may be less abundant, and livestock grazing and high severity, large fires introduce new ecological dynamics.
Submodel
Mechanism
This transition occurred with naturalization of non-native annual species such as red brome (Bromus rubens), cheatgrass (Bromus tectorum), and redstem storks bill (Erodium cicutarium), and the introduction of livestock grazing with European exploration and settlement from the 1860s through the 1900s (e.g. Brooks and Chambers 2011). The ubiquitous presence of non-native annuals means that removing them entirely and returning to the reference state is not possible.
Model keys
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Ecological sites
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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.