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
    Author(s): Patrick J. Mullholland; Jennifer L. Tank; Diane M. Sanzone; Wilfred M. Wollheim; Bruce J. Peterson; Jackson R. Webster; Judy L. Meyer
    Date: 2000
    Source: Ecological Monographs. 70(3). 2000. p. 471-493
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (2.1 MB)

    Description

    Nitrogen uptake and cycling was examined using a six-week tracer addition of 15N-labeled ammonium in early spring in Waer Branch, a first-order deciduous forest stream in eastern Tennessee. Prior to the 15N addition, standing stocks of N were determined for the major biomass compartments. During and after the addition, 15N was measured in water and in dominant biomass compartments upstream and at several locatiogs downstream. Residence time of ammonium in stream water (5-6 min) and ammonium uptake lengths (23- 27 m) were short and relatively constant during the addition. Uptake rates of NH4 were more variable, ranging from 22 to 37 µg N·m-1·min-1 and varying directly with changes in streamwater ammonium concentration (2.7-6.7 μg/L). The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N.

    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

    Mullholland, Patrick J.; Tank, Jennifer L.; Sanzone, Diane M.; Wollheim, Wilfred M.; Peterson, Bruce J.; Webster, Jackson R.; Meyer, Judy L. 2000. Nitrogen cycling in a forest stream determined by a 15N tracer addition. Ecological Monographs. 70(3). 2000. p. 471-493

    Keywords

    ammonium uptake length, 15N, gross primary production, nitrate uptake length, nitrification, nitrogen cycling, respiration, stable isotope, stream ecosystem, tracer addition

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/9401