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Study shows reforestation in Lower Mississippi Valley reduces sediment
Date:12/2/2013

A modeling study by U.S. Forest Service researchers shows that reforesting the Lower Mississippi Alluvial Valley can significantly reduce runoff from agricultural lands and the amount of sediment entering the area's rivers and streamsand ultimately the Gulf of Mexico. The journal Ecological Engineering recently published the results of the study by Forest Service Southern Research Station scientists Ying Ouyang, Ted Leininger, and Matt Moran.

The Lower Mississippi Alluvial Valley, located in the historic floodplain of the Mississippi River, stretches from Cairo, Illinois south to the Gulf of Mexico. One of the largest coastal and river basins in the world, the area is also one of the most affected by floods, erosion, and sediment deposition as a result of more than a century of converting bottomland hardwood forests to agricultural lands.

Sediments from frequently flooded agricultural lands often carry pesticides and fertilizers, the latter associated with the formation of the hypoxic (low oxygen) dead zone in the Gulf of Mexico. Forest buffers reduce runoff and sediment load from flooded agricultural lands; in the Lower Mississippi Alluvial Valley, the frequently flooded agricultural land in the batture (land that lies between a river and its levees, pronounced batch-er) seems a prime site to start reforestation efforts.

The U.S. Endowment for Forestry and Communities (the Endowment) commissioned the study, and co-funded it with Forest Service State and Private Forestry. "This study provides further evidence of the key role forests play in flood control and in reducing sediment flow from agricultural lands into our watersheds," notes Carlton Owen, president and CEO of the Endowment. "The new forest areas would also provide regional economic and environmental benefits by not only improving water quality but also wildlife habitat and recreational opportunities."

The researchers chose two Lower Mississippi River All
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Contact: Ying Ouyang
youyang@fs.fed.us
662-325-8654
USDA Forest Service ‑ Southern Research Station
Source:Eurekalert

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