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United States Department of Agriculture

Agricultural Research Service

Title: Nitrogen Removal by Two Sequential in-Stream Wetlands in a Southeastern Coastal Plain Watershed

item Hunt, Patrick
item Stone, Kenneth
item Humenik, Frank - NC STATE UNIV
item Matheny, Terry
item Johnson, Melvin

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: October 26, 1997
Publication Date: N/A

Technical Abstract: An objective of the USDA Water Quality Demonstration Project on the Herrings Marsh Run in Duplin Co, NC, was to improve water quality via voluntary methods. To this end, a 3.3-ha in-stream wetland was established in an abandoned pond at the exit of the 425-ha watershed. Before establishment of the wetland, the stream had ammonia-N and TKN means sof no more than 1 mg/L, but the nitrate-N mean was 7 mg/L. The wetland dropped nitrate-N concentration in the stream to < 1 mg/L, and dramatically lowered nitrogen export during the warmer months. However, during the cooler months, the nitrogen load was only slightly reduced so that the annual mass reduction was about 65%. In order to obtain more nitrate-N reduction during the cooler months, an additional 1-ha in-stream wetland was added. The new wetland had minimal effect on ammonia-N and TKN, but it reduced nitrate-N from 11 to 8 mg/L.

Last Modified: 4/22/2015
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