The Reference State represents the plant communities that are adapted to a high water table under a natural disturbance regime. The water table is quite variable across this site and the depth of the available water will largely determine the plants present on the site. Drier locations will have plants adapted to drier soil conditions (Nevada bluegrass), while wetter locations will have plants adapted to wetter soil conditions (sedge/rushes).
The Current Potential State is similar to the Reference State except the plant communities have non-native species present. The presence of non-native species, especially those that are invasive, lowers the resistance and resiliency of the state. Invasive/non-native plants that can come in with a high water table are meadow foxtail (Alopecurus arundinaceus), quackgrass (Elymus repens), reed canarygrass (Phlaris arundinacea), and Kentucky bluegrass (Poa pratensis). These species are also more tolerant of grazing and can increase and may become dominant on the site.
The Degraded/Lower water table State develops after a permanent lowering of the water table. This can occur from excessive grazing that can cause meadow downcutting or through artificial meadow drainage to decrease soil saturation. State 1 and State 2 can transition to this state. This state can be similar to the Semiwet Fresh Meadow site in early seral status. The site has crossed the threshold. This state cannot be returned to State 1 without raising the water table.
This transition develops through permanently lowering the late growing season water table.
This can occur with continued improper grazing management. It may also occur with proper grazing on the site, but channel erosion may continue if poor off-site conditions because more frequent and/or severe flooding.
Model keys
Briefcase
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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.
) icon wherever it occurs. Drag and drop items to reorder. Cookies are used to store briefcase items between browsing sessions. Because of this, the number of items that can be added to your briefcase is limited, and briefcase items added on one device and browser cannot be accessed from another device or browser. Users who do not wish to place cookies on their devices should not use the briefcase tool. Briefcase cookies serve no other purpose than described here and are deleted whenever browsing history is cleared.
