JD Mahogany Rockland 12-16 PZ
Scenario model
Current ecosystem state
Select a state
Management practices/drivers
Select a transition or restoration pathway
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Transition T1A
Time without fire, possibly combined with improperly managed grazing
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Transition T1B
Crown fire that removes overstory woody species, possibly combined with improperly managed grazing
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Transition T2A
Fire, drought event or improperly managed grazing
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Transition T2B
Fire, possibly combined with improperly managed grazing
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Transition T3A
Catastrophic fire, possibly combined with improperly managed grazing
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No transition or restoration pathway between the selected states has been described
Target ecosystem state
Select a state
Description
There are three phases in the reference state. Phase 1.1 is the mountain mahogany steppe phase dominated by mountain mahogany and bluebunch wheatgrass with antelope bitterbrush being common. The mountain mahogany perennial grass and forb phase, 1.2, results from the occurrence of fire. Phase 1.3 has an increase of juniper as a result of no fire and improper grazing.
Submodel
Description
State 2 is a state dominated by juniper and mountain mahogany. Phase 2.1 maintains only a very sparse component of shrubs, grasses and forbs. As the juniper matures it becomes the juniper woodland phase (2.2) with juniper in complete control of the ecological processes. There is no potential repair pathway for this state to state 1 due to the steepness of the site, very shallow soils, low available water capacity and high erosion potential.
Submodel
Description
State 3 is cheatgrass and shrub dominated as a result of improper grazing and severe fire in the juniper-mountain mahogany phase (1.3) or severe fire, improper grazing and drought in the juniper woodland phase (2.2). This process eliminates the woody overstory components and allows the increase of cheatgrass which gains control of the site ecological processes. There is no potential repair pathway for this state to State 1 due to the steepness of the site, very shallow soils, low available water capacity and high erosion potential.
Submodel
Description
State 4 is the eroded state of this site. Improper grazing and fire in the juniper woodland phase (2.2) and the cheatgrass shrub phase (3.1) exposes significant amounts of bare ground which leads to severe erosion.
Submodel
Mechanism
Time without fire, possibly combined with improperly managed grazing
Mechanism
Crown fire that removes overstory woody species, possibly combined with improperly managed grazing in the presence of invasive annual species
Mechanism
Fire, drought event or improperly managed grazing in the presence of invasive annual species
Mechanism
Catastrophic fire, possibly combined with improperly managed grazing
Model keys
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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.