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Eastern savannas of the United States
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Prehistoric southeastern flora
Of all the United States, southeastern flora has been least changed in composition during the last 20,000 years, although changed in other ways.
During the Last Glacial Maximum about 18,000 years ago, the influence of Arctic air masses and boreal vegetation extended to about 33° N. latitude, the approximate latitude of Birmingham and Atlanta. Forests of the glacial period were dominated by various spruce species and jack pine; fir was abundant in some locations.
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Prehistoric southeastern flora
Of all the United States, southeastern flora has been least changed in composition during the last 20,000 years, although changed in other ways.
During the Last Glacial Maximum about 18,000 years ago, the influence of Arctic air masses and boreal vegetation extended to about 33° N. latitude, the approximate latitude of Birmingham and Atlanta. Forests of the glacial period were dominated by various spruce species and jack pine; fir was abundant in some locations. With the exception of the absence of certain prairie elements, the understories of these forests were generally typical of modern spruce-fir forests within and near Canada. Temperate deciduous forests dominated from about 33° to 30° N. latitude, including most of the glacial Gulf Coast from about 84° W. longitude. The coastline later changed during glacial melt, both in the Mississippi River valley and sea level rise of 130 meters (400 ft). Regional climate was similar to or slightly drier than modern conditions. Oak, hickory, chestnut, and southern pine species were abundant. Walnuts, beech, sweetgum, alder, birch, tulip tree, elms, hornbeams, tilias, and others that are generally common in modern southern deciduous forests were also common then. Grasses, sedges, and sunflowers were also common. Extensive mesophytic forest communities, similar to modern lowland and bottomland forests, occurred along major river drainages, especially the Mississippi embayment, the Alabama-Coosa-Tallapoosa Basin, the Apalachicola-Chattahoochee-Flint Basin, and the Savannah River Basin.
Humans arrived as five thousand years passed following the retreat of the glaciers, while deciduous forests expanded northward throughout the region. Pockets of boreal elements remained only at high elevations in the Appalachian Mountains and in a few other refuges. Broadleaf evergreen and pine forests occupied an extent similar to their current one, primarily in the Atlantic Coastal Plain. Mesophytic and bottomland forest communities continued to occupy the major river drainages of the region.
Although the major modern community types were flourishing in the Southeast by 10,000 years BP, and the climate was similar to that today, the understory flora had not yet come to resemble modern herbaceous floras. Mixed hardwood forests dominated the majority of the upper Coastal Plains, Piedmont, and lower Mountain regions. Southern pine communities dominated the middle and lower Coastal Plains, whereas evergreens and some remnant boreal elements occupied higher elevation sites. There were few canopy openings in the mixed hardwood and high-elevation forest.
Warming and drying during the Holocene climatic optimum began about 9,000 years ago and affected the vegetation of the Southeast. Extensive expansions of prairies and savannas occurred throughout the region, and xeric oak and oak-hickory forest types proliferated. Cooler-climate species migrated northward and upward in elevation; many vanished from the region during this period while others were limited to isolated refuges. This retreat caused a proportional increase in pine-dominated forests in the Appalachians. The grasslands and savannas of the time expanded and were also linked to the great interior plains grasslands to the west of the region. As a result, elements of the prairie flora became established throughout the region, first by simple migration, but then also by invading disjunct openings (including glades and barrens) that were forming in the canopy of more mesic forests.
During most of the climatic shifts of the last 100,000 years, most plant migration in Eastern North America occurred along a more or less north-south axis. The climate optimum was significant because it made conditions favorable for the invasion and establishment of species from the center of the continent.
After the end of the optimum about 5,000 years BP, as the climate cooled and precipitation increased, species migrated so that communities were reassembled in new forms in which all of the components of the modern southern forests were in place. The boreal forests of the early Quaternary enjoyed a modest expansion. Riparian, bottomland, and wetland plant communities expanded. Grasslands and savannas contracted and retracted westward.
At about 4,000 years BP, the Archaic Indian cultures began practicing agriculture throughout the region. Technology had advanced to the point that pottery was becoming common, and the small-scale felling of trees became feasible. Concurrently, the Archaic Indians began using fire in a widespread manner in large portions of the region. Intentional burning of vegetation was taken up to mimic the effects of natural fires that tended to clear forest understories, thereby making travel easier and facilitating the growth of herbs and berry-producing plants that were important for both food and medicines.
Recent history
The oak-hickory forest of the Northeast was primarily burned by Native Americans, resulting in "oak openings", "barrens", and prairies in the Northeast and the Piedmont of North Carolina. After the death of 90% of the native population around 500 years ago, grasslands, savanna, and woodlands succeeded to closed forest. European settlement of the region increased burning frequency to 2-10 years, with many sites burned annually. The practice was so common that a North Carolina law in the early 1700s required annual burning of pastures and rangelands every March.
In the southeast, longleaf pine dominated the savanna and open-floored forests which once covered from Virginia to Texas. These covered 36% of the region's land and 52% of the upland areas. Of this, less than 1% of the unaltered forest still stands.
Savannas typically contained grasses that were 3 to 6 feet (1 to 2 m) high.
The southeast also had the Black Belt prairie region, within which was the blackland prairie, a type of tallgrass prairie. Much of the Black Belt region was open space. As late as the 1830s, about 11% of the Black Belt region was covered with prairies.
The largest prairie area in the southern Atlantic coastal plain was in the Florida panhandle region, from the Ochlockonee River to Louisiana's Florida Parishes
Savanna elimination
The English colonists harvested the longleaf pine lumber, finding many uses for it. The slow-maturing tall straight trees were particularly suitable for shipbuilding and masts, although the lumber and pitch were widely used. The keel of the USS Constitution was made from a single longleaf pine log. King George II decreed that straight pines over in diameter were the king's property, but the colonists protested by tarring and feathering the official surveyors. However, harvesting was rather limited until 1900.
At the start of the 20th century, heavy cutover of the Southern pine forest, combined with longleaf pine seedling destruction by foraging livestock, eliminated pine regeneration. As reflected by the 1924 federal Clarke-McNary Act, fire suppression began to be practiced. The American Forestry Association's "Dixie Crusaders" told the South that burning woods were bad. The paper industry encouraged growth of loblolly and slash pines. The probability of catastrophic high-intensity fire increased as dead fuels increased on the forest floor. Overgrowth shades and stunts longleaf pine seedlings, undergrowth increases, and succession creates the Southern mixed hardwood forest where savanna used to be. Intentional use of fire to manage vegetation began to be accepted again after World War II, and at present about a year are burned.
Remaining examples
The ecosystem of over 98% of eastern savanna areas such as longleaf pine have declined.
Remaining savanna and prairie cover some of the land in the following locations:
The largest prairie remnants are at:
Flora
Members of the Northeast upland oak communities:
- Trees
- Invasive hardwoods in disrupted fire regimes
Growing in the southeast pine forest:
- Trees
- Grasses
- Woody understory
Exotics promoted by fire:
Fauna
Fauna which lived in the savanna include:
Living in prairie habitats:
See also
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