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Northern Humid Gulf Coastal Prairies

Ecoregion in Atlantic Coastal Plain in TX, LA

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Quaternary-age deltaic sands, silts, clays, and gravel underlie much of the Northern Humid Gulf Coastal Prairies on this gently sloping coastal plain. The original vegetation was mostly tallgrass grasslands with gallery forests along streams. Little bluestem, big bluestem, yellow Indiangrass, brownseed paspalum, and switchgrass were dominant grasses, in a mixture with hundreds of other herbaceous species across these prairies. Almost all of the coastal prairies have been converted to cropland, pasture, crawfish aquaculture, or urban land uses. Some loblolly pines, and historically “islands” of longleaf pine, occur in the northern part of the region in the transition to Ecoregion 35. Soils in the Louisiana portion are mostly poorly or somewhat poorly drained Alfisols with silt loam or silty clay loam texture, while some Vertisols and Mollisols also occur. Pimple mounds of loamy sand were prevalent across the prairie terrace, providing micro-habitat variation.

— EPA

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