Flatwoods,pineywoods,pine savannas andlongleaf pine–wiregrass ecosystem are terms that refer to anecological community in the southeasterncoastal plain ofNorth America. Flatwoods are an ecosystem maintained bywildfire orprescribed fire and are dominated bylongleaf pine (Pinus palustris), andslash pine (Pinus elliotii) in the tree canopy and saw palmetto (Serenoa repens), gallberry (Ilex glabra) and other flammable evergreen shrubs in the understory, along with a high diversity of herb species.[1][2] It was once one of the dominant ecosystem types of southeastern North America. Although grasses and pines are characteristic of this system, the precise composition changes from west to east, that is, fromTexas toFlorida. InLouisiana,savannas even differ between the east and west side of theMississippi River.[citation needed] The key factor maintaining this habitat type is recurring fire. Without fire, the habitat is eventually invaded by other species of woody plants.[1]
A number of rare and endangered animals are typical of this habitat includingred-cockaded woodpeckers (Picoides borealis), gopher tortoises (Gopherus polyphemus),frosted flatwoods salamanders (Ambystoma cingulatum), and striped newts (Notophthalmus perstriatus). Many rare and usual herbaceous plants are found here, particularly orchids (e.g.Calopogon species,Pogonia ophioglossoides), sedges (e.g.Rhynchospora species) and carnivorous plants (e.g.Sarracenia species).[3]
A second key factor is moisture. Overall, wet pine savannas have more species than pine savannas, and the distribution of each species within a savanna is intimately connected with soil moisture regimes. Temporary ponds, and seepage areas, are therefore a critical control on plantspecies composition. Orchids andpitcher plants, for example, are associated with wetter locations.[4] But even these wetter locations burn during dry periods, allowing regeneration of species of pitcher plant[5] andsundew.[6]
Pineywoods are characterized by lowbasal area and large widely spaced mature pine. Historically, the flatwoods were dominated by longleaf pine, which can live to be 500 years old. Large scaleoverharvesting in conjunction with detrimentalsilvicultural practices like replacement with faster growingloblolly pine has drastically reduced the range of the longleaf pine ecosystem. Longleaf requires frequent fires, ideally every 1–3 years, which prevent invasion of the habitat by other tree species. Decades of fire exclusion in the Southeast have contributed to the decline of this community type.[2] However, with the restoration of fire, and natural flooding regimes, it is possible to restore small areas of habitat.[7] Some private organisations are engaged in such projects.[8][9] With concerted effort, several large wilderness areas could still be restored east of the Mississippi River. Some of the largest remaining areas of this habitat type are found inDe Soto National Forest, Eglin Air Force Base, andApalachicola National Forest.[7]