Loamy Overflow
Scenario model
Current ecosystem state
Select a state
Management practices/drivers
Select a transition or restoration pathway
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Transition T1A
Heavy grazing, high levels of ground litter accumulation, or introduction of invasive species.
More details -
Transition T1B
Lack of fire for more than 5 years.
More details -
Transition T1C
Tillage or other agricultural practices.
More details -
Restoration pathway R1A
Managed grazing plans
More details -
Transition T2A
Lack of fire for more than 5 years.
More details -
Transition T2B
Tillage and farming practices.
More details - Restoration pathway R3A More details
- Transition T3B More details
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Transition T3A
Lands have been cleared and cultivated.
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 considered to be representative of the native range of variability under pre Euro-settlement conditions. Community phase changes in this state are primarily driven by a fire return interval less than 5 years, periodic drought cycles, and light to moderate grazing pressure.
Submodel
Description
This state is dominated by cool season invasive grasses resulting from heavy grazing and high ground litter accumulation. Some native species are still present. From this state, a shift can occur to an agricultural state or a return to the reference state.
Submodel
Description
The encroached state is characterized by increased cover of native woody species due to the absence of wildfire. Ecological processes such as energy distribution, nutrient cycling, and soil moisture recharge are being controlled by trees. Herbaceous species in the understory experience reduced productivity and reproductive capacity due to shading.
Submodel
Description
Lands have been cleared and cultivated. These management actions represent a discrete event that truncates energy, nutrient, water cycling dynamics reducing ecological resilience.
Once the site is cultivated, soil properties such as structure and organic matter are permanently altered.
Submodel
Mechanism
The introduction of non-native, cool-season, perennial grasses that can not be removed from the system. Prolong periods of heavy grazing pressure reduce vigor and reproductive capacity of native species allowing non-natives to establish. This process can be exacerbated by the absence of wildfire that allows for the accumulation of litter that favors non-native, cool-season, grasses.
Mechanism
Lengthened fire return intervals (greater than 5 years) allow native woody species in encroach and being to dominant the ecological processes. As canopy cover increases herbaceous perennial understory is reduced in both vigor and reproductive capacity. Heavy grazing pressure may exacerbate the impacts of woody species encroachment. Nutrient cycling, energy capture and hydrologic function have been spatially and temporally truncated by the dominance of trees.
Mechanism
Lands have been cleared and cultivated. These management actions represent a discrete event that truncates energy, nutrient, water cycling dynamics reducing ecological resilience. Once the site is cultivated, soil properties such as structure and organic matter are permanently altered.
Mechanism
Managed grazing plans remove invasive species and allow native grasses to regain dominance on the site.
Mechanism
Lengthened fire return intervals (greater than 5 years) allow native woody species in encroach and being to dominant the ecological processes. As canopy cover increases herbaceous perennial understory is reduced in both vigor and reproductive capacity. Heavy grazing pressure may exacerbate the impacts of woody species encroachment. Nutrient cycling, energy capture and hydrologic function have been spatially and temporally truncated by the dominance of trees.
Mechanism
Lands have been cleared and cultivated. These management actions represent a discrete event that truncates energy, nutrient, water cycling dynamics reducing ecological resilience. Once the site is cultivated, soil properties such as structure and organic matter are permanently altered.
Mechanism
The encroached state will not return to the reference state without significant management actions. To restore this community to reference-like conditions requires the continued use of prescribed burning (fire return interval of ~5years is required to maintain the reference state). Management may also initially require herbicide and mechanical brush control. Additional considerations include deferment from grazing and the health and vigor of remnant native grass species in the understory.
Mechanism
Fire returns to this site but is coupled with heavy grazing soon after allowing a return to the invaded state rather than the reference state.
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.