Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.
Major Land Resource Area (MLRA): 134X–Southern Mississippi Valley Loess
MLRA 134, Southern Mississippi Valley Loess, is in Mississippi (39 percent), Tennessee (23 percent), Louisiana (15 percent), Arkansas (11 percent), Kentucky (9 percent), Missouri (2 percent), and Illinois (1 percent). It makes up about 26,520 square miles (68,715 square kilometers). The northern part of the area includes Paducah and Murray, Kentucky; Paragould, Jonesboro, and Forrest City, Arkansas; and Memphis, Dyersburg, Bartlett, and Germantown, Tennessee. The southern part includes Yazoo City, Clinton, and Jackson, Mississippi, and Baton Rouge, Opelousas, Lafayette, and New Iberia, Louisiana. This portion is the farthest southeast part of the MLRA in Louisiana. It is in the Mississippi Valley Loess Plains Section of the EPA Ecoregions in sub-section 74d, Baton Rouge Terrace. The dissected plains in this MLRA have a loess mantle that is thick at the valley wall and thins rapidly as distance from the valley wall increases. The Baton Rouge Terrace ecoregion occurs on the Pleistocene Prairie Terraces and is lower in elevation and has flatter topography than Ecoregion 74c to the north.
Major Land Resource Area (MLRA) and Land Resource Unit (LRU) (USDA-Natural Resources Conservation Service, 2006)
EPA Level IV Ecoregion
The Natural Communities of Louisiana - (Louisiana Natural Heritage Program - Louisiana Department of Wildlife and Fisheries)
Ecological site concept
Stream terraces above the floodplain which are somewhat poorly drained to well drained. These areas will flood during heavy rainfall events but are not flooded regularly. Flooding frequency would be none to frequent depending on the location within the sites, which could be up to 50 times in 100 years. The site has no ponding frequency. Slopes range from 0 to 8 percent however generally around 2 percent. This site would be in thinner loess deposits of the MLRA.
Baton Rouge Terrace Southern Loess Drainageway - PROVISIONAL
Baton Rouge Terrace Southern Loess Drainageway is found at the next lower elevation from this site in the Baton Rouge Terrace.
Baton Rouge Terrace Southern Loess Low Terrace - PROVISIONAL
Baton Rouge Terrace Southern Loess Low Terrace is found at the next higher elevation from this site in the Baton Rouge Terrace, but may pond sue to less slope.
Southern Rolling Plains Loess Stream Terrace - PROVISIONAL
Southern Rolling Plains Loess Stream Terrace fits a similar site position on the landscape, however is found in the Rolling Plains and Bluff Hills Portion of the MLRA to the north of this site.
Table 1. Dominant plant species
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