Natural Resources
Conservation Service
Ecological site F134XY306LA
West Central Well Drained Loamy Ridge - PROVISIONAL
Accessed: 12/06/2024
General information
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.
MLRA notes
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 central western part of the MLRA in Louisiana and Arkansas. It is in the Macon Ridge Section of the EPA Ecoregions in sub-section 73j. 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. This portion of the MLRA is distinct from other portions of the MLRA because of the influences of the Mississippi River and it series of entrenchments and adjacent old channels of the Arkansas River, such channels as Bayou Bartholomew, Bayou Bonnne Idee, Boeuf River, and segments of the Ouachita River. The Macon Ridge has been inhabited prior to European Settlement, Poverty Point is located on the east central portion of the Macon Ridge and has earthworks dating back to 1700-1100 BC.
Classification relationships
Major Land Resource Area (MLRA) and Land Resource Unit (LRU) (USDA-Natural Resources Conservation Service, 2006)
The Natural Communities of Louisiana - (Louisiana Natural Heritage Program - Louisiana Department of Wildlife and Fisheries)
EPA Level IV Ecoregion
Ecological site concept
Very deep, well drained, moderately permeable soils that formed in loamy sediments on stream braid bars within the Macon Ridge Loess with little to no loess influence. These sites are found on long narrow slight rises on terraces where thin loess deposits are mixed throughout with loamy underlying braided stream material, Slopes are 5% or less. Soils limitations could include high exchangeable Al (Aluminum). This soil chemistry limitation is significant because, Aluminum (Al) toxicity limits production on strongly acidic soils, pH values at or below 5, toxic forms of Al solubilized into the soil solution, inhibiting root growth and function (Kochian, 2005). Common species on this site are Cherrybark oak, Loblolly pine, Pecan, Eastern Cottonwood and Sweetgum.
Associated sites
F134XY304LA |
West Central Somewhat Poorly Drained Flats - PROVISIONAL The Somewhat Poorly Drained Flats sites will be at a lower level on the landscape. |
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F134XY305LA |
West Central Somewhat Poorly Drained Loess Terrace - PROVISIONAL The Somewhat Poorly Drained Loess Terrace sites will be at a lower level on the landscape. |
F134XY307LA |
West Central Loess Ridge - PROVISIONAL The Loess Ridge site will be found at a higher landscape position. |
Similar sites
F134XY307LA |
West Central Loess Ridge - PROVISIONAL The West Central Loess Ridge is found at higher landscape position. |
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Table 1. Dominant plant species
Tree |
Not specified |
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Shrub |
Not specified |
Herbaceous |
Not specified |
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