Loamy Summit Woodland
List model
Reference State - Longleaf Pine/ Turkey Oak - Southern wiregrass upland
Degraded longleaf pine forest
Mixed pine - oak woodland
Oak - hardwood forest
Planted longleaf plantation - native grasses
Planted pine plantation
Cropland or Pasture
Abandoned/Old field
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 T1D More details
- Transition T1E 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 is the historic climax plant community for this ecological site. An open canopy of longleaf pine exists with a minimal scrub oak understory, commonly turkey oak (Quercus laevis) with some bluejack oak (Q. incana) and blackjack oak (Q. marilandica). Fire is the most important process in maintaining the natural vegetation of this ecological site. The amount of canopy closure in this community depends on the fire regime. Lack of fire tends to lead to the degradation of the natural vegetation by causing canopy closure by hardwoods and loss of longleaf pine and native grasses.
Submodel
Description
The longleaf pine-hardwood forest state is characterized by a more closed canopy relative to the reference state. Oak species (Quercus marilandica, Q. incana) cover begins to rival longleaf pine. Less fire-tolerant pines such as loblolly pine (Pinus taeda) begin to establish. Hardwood trees such as dwarf post oak (Q. margarettae), and persimmon (Diospyros virginiana) compete with the remaining longleaf for canopy space. Shrub density and mass is increased relative to the reference state. Herbaceous species richness and productivity will continue to decline with canopy closure and the resulting decrease in sunlight penetration. Species richness is the number of different species present.
Description
Lack of a favorable environment for regeneration and competition from hardwoods and other pines have resulted in either longleaf being lost from the site, or remaining individual trees being widely dispersed. Pines such as loblolly pine may have become established due to lack of fire. Canopy closure approaches 100 percent, dominated by oaks with some hickory, sweetgum, and persimmon. Because of lack of sunlight penetration to the understory, shrub size and numbers are reduced relative to state 2, and herbaceous species characteristic of the reference state are very sparse or no longer present.
Description
The Oak - Hardwood state is the product of long-term lack of fire management (century scale?). This community phase is naturally present in patches within the larger ecological site, most often on microsites that are protected from fire (Frost and Langley, 2008; Edwards et al., 2013). However, large-scale fire suppression allows continued encroachment of fire-tolerant oaks, and longleaf pine reproduction eventually ceases. This leaves the site open for continued scrub oak domination. Fine fuels typical for low intensity ground fires are absent, but coarser fuels such as branches and leaves are present.
At Fort Gordon near Augusta, GA, this state has resulted from annual dormant season burns after hardwood establishment (Michale Juhan, personal communication). The timing and frequency of the prescribed fire have not been favorable for longleaf regeneration. Brockway and Outcalt (2000) suggest that presecribed fire alone is not effective at enhancing natural longleaf establishment after a major disturbance event such as wildfire. Hardwood removal (chemical or mechanical) in combination with prescribed fire is much more effective.
Description
Longleaf pine are planted to grow trees to a marketable size or to attempt to restore a system that would be similar to the reference plant community and in the interim sell pine straw as an urban landscape mulch (Alig et al., 2002). However, the richness of herbaceous species and associated animals are unlikely to completely mimic the reference state. However, this state is a functioning ecosystem with strong similarities to the reference plant community. Planted pines are generally even-aged and evenly spaced. If longleaf pine planting density is too high, the trees will shade out heliophytic native ground cover. In dense even-aged stands needle fall may be high, which can contribute to hotter fires. Consultation with a professional forester is recommended before establishing a longleaf pine plantation. Grasses commonly planted in this state are wiregrass, little bluestem, Indiangrass and switchgrass.
Description
Loblolly and slash are the pine species most often planted in the region to produce a marketable wood product. Establishment of these pines has resulted in longleaf stands lacking native ground cover. Subsequent management will be in keeping with long-term and interim objectives and may include vegetation management with prescribed burning, and periodic stand thinning.
Description
If a pine plantation is not established, the most common agricultural use of the site is pasture or hay production. Fruit and vegetable production, and row crops can be regionally important.
Agricultural yield information is available through Web Soil Survey (WSS) and can accessed here: http://websoilsurvey.nrcs.usda.gov/app/HomePage.html
Description
When management or regular disturbances cease on cut-over forest, row crop or forage land, weedy and woody species become established.
The abandoned field state is recognized by secondary plant community succession.
Invasive species such as Chinese privet (Ligustrum sinense), silktree (Albiziz julibrissin), and cogon grass (Imperata cylindrical) can invade and dominate southern pine sites and prevent many uses. Cogon grass is particularly difficult and costly to control.
Mechanism
Continued infrequent or lack of fire will lead to a transition from state 1 to state 2. Increased hardwood and shrub development will occur, and these species will become more fire-tolerant as basal diameters increase. Lack of fire allows the accumulation of a thick litter layer, which inhibits longleaf pine seed germination. Lack of longleaf regeneration further enhances the success of hardwood species.
The threshold from state 1 to state 2 is crossed when the natural fire frequency is removed for more than 5 years. Without persistent and costly management, reversal (restoring state 1) is extremely difficult (Walker and Silletti, 2006).
Mechanism
Transition from state 1 to state 5: Clear cut, plant longleaf, re-establish native groundcover if necessary
Although not recommended, it is possible to convert from state 1 to state 5. Site preparation should occur after an area is clear cut. Coarse woody debris can impede tree planters. Concentrating debris in windrows and piles and burning it is recommended. Unwanted vegetation should be controlled prior to planting to reduce competition for the new stand. This can be accomplished by mechanical and/or chemical methods. Herbicide prescriptions can be developed to target specific species or groups of unwanted vegetation. For example, some herbicides target woody plants; others kill grasses or legumes. Care should be taken when using herbicides to avoid unwanted disturbance and herbicide application to any remaining native ground cover.
The site should be monitored for appearance of native groundcover. If herbaceous species do not naturally regenerate, the seed source may have been lost. Native groundcover should be established by planting.
Selective cutting can perpetuate stand integrity while providing monetary gain to the landowner. Professional foresters should be consulted on this type of management goal.
Mechanism
Transition from state 1 to state 6: Clear cut, plant pines (longleaf, loblolly, slash), maintain 2-3 year fire frequency
Although not recommended, it is possible to convert from State 1 to State 6. Site preparation should occur after an area is clear cut. Coarse woody debris can impede tree planters. Concentrating debris in windrows and piles and burning it is recommended. Unwanted vegetation should be controlled prior to planting to reduce competition for the new stand. This can be accomplished by mechanical and/or chemical methods. Herbicide prescriptions can be developed to target specific species or groups of unwanted vegetation. For example, some herbicides target woody plants, while others kill grasses or legumes.
Selective cutting can perpetuate stand integrity while providing monetary gain to the landowner. Professional foresters should be consulted on this type of management goal.
Mechanism
Transition from State 1 to State 7: Clear-cut, stump and brush removal, establish crop or pasture
Model keys
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