Loamy Terrace
Scenario model
Current ecosystem state
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Management practices/drivers
Select a transition or restoration pathway
- Transition T1A More details
- Transition T1B More details
- Transition T1C More details
- Transition T2A More details
- Transition T2B More details
- Transition T3A More details
- Restoration pathway R4A More details
- Restoration pathway R4B More details
- Restoration pathway R4C 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 describes the range of vegetative community phases that occur on the Loamy Lowland site where the natural processes are mostly intact.
The Reference Community is a representation of the native plant community phase that occupies a site that has been minimally altered by management. The Degraded Native Grass Community and the Excessive Litter Community are the phases that result from management decisions that are unfavorable for a healthy Reference Community. The Ephemeral Forb Community is the result of a high-intensity disturbance event.
High perennial grass cover and production allows for increased soil moisture retention, vegetative production, and overall soil quality.
Submodel
Description
This state has been degraded from the Reference State and much of the native warm-season grass community has been replaced by less desirable plants. The loss of warm-season tall- and mid-grasses has negatively impacted energy flow and nutrient cycling. Water infiltration is reduced due to the shallow root system and rapid runoff characteristics of the grazing-evasive plant communities.
The Native Shortgrass/Invaded Grass and the Smooth Brome Communities are the components of the Native/Invaded Grass State.
Submodel
Description
This threshold is crossed as a result of mechanical disturbance to facilitate production agriculture. If farming operations are suspended, the site can; be abandoned, which will result in the Natural Reclamation Community, or be reseeded to a desired perennial forage mixture, which is described as the Reseeded Pasture Community. Permanent alterations of the soil community and the hydrological cycle make restoration to the original native Reference State extremely difficult, if not impossible. Formation of a compacted plow pan in the soil profile is likely.
Submodel
Description
Once the tree canopy cover reaches 15 percent with an average tree height exceeding 5 feet, the threshold is crossed to the Invaded Woody State. The primary coniferous interloper is eastern redcedar. Honeylocust and green ash number among the deciduous native trees, along with several exotic introduced species such as Siberian elm. These woody species are encroaching due to lack of prescribed fire and other brush management practices. Typical ecological impacts are a loss of native warm-season grasses, degraded forage productivity, and reduced soil quality. This state includes the Mixed Woody Community and the Eastern Redcedar Community.
Submodel
Mechanism
Heavy grazing without adequate recovery periods will cause this state to lose a significant proportion of warm-season tall- and midgrass species and cross a threshold to the Native/Invaded Grass State. Water infiltration and other hydrologic functions will be reduced due to the root matting presence of sod-forming grasses. With the decline and loss of deeper penetrating root systems, soil structure and biological integrity are catastrophically degraded to the point that recovery is unlikely. Once this occurs, it is highly unlikely that grazing management alone will return the community to the Reference State.
Mechanism
The Reference State is significantly altered by mechanical tillage to allow the site to be placed into production agriculture. The disruption to the plant community, the soil and the hydrology of the system make restoration to a true reference state unlikely.
Mechanism
Disruption of the natural fire regime and the planting of invasive exotic and native woody species can cause this state to shift to the Invaded Woody State.
Mechanism
The state is significantly altered by mechanical tillage to allow the site to be placed into production agriculture. The disruption to the plant community, the soil, and the hydrology of the system make restoration to a true Reference State unlikely.
Mechanism
Disruption of the natural fire regime and the planting of invasive exotic and native woody species can cause this state to shift to the Invaded Woody State.
Mechanism
Disruption of the natural fire regime, and the planting of invasive exotic and native woody species causes a major shift in the vegetative community. The resulting impacts to the system cross the threshold into the Invaded Woody State.
Mechanism
Prescribed burning, wildfire, harvest, and brush management will move this plant community toward one of the herbaceous dominated plant communities. The forb component of a site with heavy tree density or canopy cover will initially increase following tree removal through mechanical brush management treatments and prescribed fire.
If resprouting brush or trees such as honeylocust or Siberian elm are present, stumps must be chemically treated immediately after mechanical removal. Ongoing brush management such as hand cutting, chemical spot treatments, or periodic prescribed burning is required to prevent a return to this state.
Relevant conservation practices
| Practice | External resources |
|---|---|
|
Brush Management |
|
|
Prescribed Burning |
Mechanism
Prescribed burning, wildfire, harvest, and brush management will move this plant community toward one of the herbaceous dominated plant communities. The forb component of a site with heavy tree density or canopy cover will initially increase following tree removal through mechanical brush management treatments and prescribed fire.
If resprouting brush or trees such as honeylocust or Siberian elm are present, stumps must be chemically treated immediately after mechanical removal. Ongoing brush management such as hand cutting, chemical spot treatments, or periodic prescribed burning is required to prevent a return to this state.
Relevant conservation practices
| Practice | External resources |
|---|---|
|
Brush Management |
|
|
Prescribed Burning |
Mechanism
Prescribed burning, wildfire, harvest, and brush management will move this plant community toward one of the herbaceous dominated plant communities. The forb component of a site with heavy tree density or canopy cover will initially increase following tree removal through mechanical brush management treatments and prescribed fire.
If resprouting brush or trees such as honeylocust or Siberian elm are present, stumps must be chemically treated immediately after mechanical removal. Ongoing brush management such as hand cutting, chemical spot treatments, or periodic prescribed burning is required to prevent a return to this state.
Relevant conservation practices
| Practice | External resources |
|---|---|
|
Brush Management |
|
|
Prescribed Burning |
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.