Wet Clayey Terrace
Scenario model
Current ecosystem state
Select a state
Management practices/drivers
Select a transition or restoration pathway
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Transition T1A
Large scale disturbance
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Transition T1C
Clearing of site; agricultural production - forage
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Transition T1B
Clearing of site; agricultural production -row crops.
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Restoration pathway R2A
Restoration inputs such as planting, brush control, prescribed fire, and timber stand improvement.
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Transition T2B
Clearing; agricultural production - forage
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Transition T2C
Clearing; agricultural production - row crops
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Transition T3B
Abandonment of agricultural practices
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Transition T3A
Site preparation and tillage, seeding, weed control, cropland management
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Transition T4A
Transition site to forage production; seeding; weed/brush control; pasture management
More details -
No transition or restoration pathway between the selected states has been described
Target ecosystem state
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Description
The Wet Clayey Terrace Reference State is characterized by a mature deciduous forest with a oak component. Flooding regime will be a major influencer on plan community composition as flooding on these sties ranges from none to frequent. Canopy species on sites often include green ash, maple, pin oak, swamp white oak, elm, and sweetgum. The shrub layer varies but often includes green hawthorn, possumhaw, and pawpaw. Understory composition and density will be varied depending on drainage, depth of wet layer, and flooding regime.
Submodel
Description
Most Wet Clayey Terrace sites have been altered due to human disturbances such as hydrological modifications, clearing, grazing or selective harvest (i.e. oak removal). Trees on site will depending on the type, length and severity of disturbances. These site may be frequently flooded and ponded which will impact understory vegetation especially.
Sites that have had a long-term absence of a natural fire regime will display the following characteristics: an increase in fire -intolerant species, decrease in oak regeneration, an increase in shrub density, an increase in leaf-litter buildup, and an increase in shade-tolerant understory species. Diversity of species may also be reduced, especially if there has been an introduction of non-native species.
Submodel
Description
A portion of these sites have been converted to pastureland or forage production. Species selection will depend upon the objectives and goals of the landowner; however, commonly planted grasses include tall fescue (Schedonorus arundinaceus), brome (Bromus spp.), white clover (Trifolium repens) and red clover (Trifolium pratense). Species health and productivity are determined by the management and long-term overgrazing on some sites has caused soil erosion and compaction.
Submodel
Description
Hydrological modifications such as ditching and tiling are often installed on these sites to increase crop production. Common crops include corn (Zea mays), soybeans (Glycine max), and occasionally winter wheat (Triticum aestivum). Some landowners choose to convert sites to cool season grasses for a period before resuming cropland production.
A return to the historical Reference State from State 4 is unlikely, if not impossible.
Submodel
Mechanism
Severe disturbances, such as clearing, grazing, or selective harvesting (oak/hickory removal) will transition this site to State 2.
Mechanism
Site is transitioned to an agricultural site focused on forage production. Management inputs would include clearing, site preparation, seeding and weed/brush control.
Mechanism
Site is transitioned to an agricultural site focused on row crop production. Management inputs would include clearing, site preparation, seeding and weed control. Hydrological modifications are often installed to aid in drainage.
Mechanism
Restoration would require long-term management inputs including planting of desired species, weed control, brush control, timber stand improvement, and prescribed fire. Sites altered by ditching and tiling would require the restoration of the natural hydrology.
Mechanism
Site is cleared and forage/pasture production is initiated. Management inputs would include tree/shrub removal, site preparation, seeding, and weed/brush control.
Mechanism
Site is cleared and row crop production is initiated. Management inputs would include tree/shrub removal, site preparation, tillage, seeding, and weed control. Hydrological modifications such as ditching and tiling are often installed to facilitate improved drainage.
Mechanism
Site is abandoned and slowly would transition to a wooded state dominated by deciduous trees. Species on site would depend on the severity and length of disturbance and available seed sources.
Mechanism
Management inputs that transition a site from pasture or forage production to a site that is utilized for row crop production.
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.