Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub

    Description

    Nutrients such as nitrogen, phosphorus and organic carbon are essential to the health and diversity of stream ecosystems. However, excess nutrients can cause eutrophication, resulting in overgrowth of aquatic plants and decline of the ecosystem diversity. A paired-watershed study was initiated in a subtropical forested watershed within the Ouachita River Basin in Louisiana to identify stream nutrient conditions with respect to the U.S. Environmental Protection Agency (EPA) suggested criteria, and to examine changes in nutrient levels following timber harvesting operations with and without BMP implementation. Nutrient concentrations were measured in both storm runoff and monthly stream water samples collected at 11 sites in the headwater streams. Water samples were analyzed for total and dissolved phosphorus, nitrite, nitrate, ammonia, total Kjeldahl nitrogen, along with total and dissolved organic and inorganic carbon. The preliminary results show that the low-order streams in these watersheds frequently exceeded the suggested nitrogen criteria before any harvesting activities were initiated. Average nitrite/nitrate at all monitoring sites (0.172 - 0.410 mgL-1) was significantly higher than EPA’s recommended level (0.067 mg L-1), especially during rainstorm events and warmer months. Total phosphorus varied from 0.028 mg L-1 - 0.104 mg L-1, which were within the EPA recommendation levels. Total organic carbon showed high levels in both monthly and storm water samples at most of the monitoring sites.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Mason, April; Xu, Y. Jun; Grace, Johnny M. 2007. Comparison of stream nutrient conditions in a subtropical lowland watershed to EPA suggested criteria. In: Proceedings of the Fourth Converence 10-14 March, San Antonio, Texas. 6 p.

    Keywords

    stream water quality, nutrient criteria, TMDLS, nitrate/nitrite, phosphorus, carbon

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page