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    Nitrate removal in stream ecosystems measured by 15N addition experiments: Denitrification

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    Issue Date
    2009-05-12
    Author
    Mullholland, Patrick J.
    Hall, Robert O.
    Sobota, Daniel J.
    Dodds, Walter K.
    Findlay, Stuart E. G.
    Grimm, Nancy B.
    Hamilton, Stephen K.
    McDowell, William H.
    O'Brien, Jonathan M.
    Burgin, Amy J.
    Publisher
    Association for the Sciences of Limnology and Oceanography
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
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    Abstract
    We measured denitrification rates using a field 15NO3− tracer-addition approach in a large, cross-site study of nitrate uptake in reference, agricultural, and suburban-urban streams. We measured denitrification rates in 49 of 72 streams studied. Uptake length due to denitrification (SWdenn) ranged from 89 m to 184 km (median of 9050 m) and there were no significant differences among regions or land-use categories, likely because of the wide range of conditions within each region and land use. N2 production rates far exceeded N2O production rates in all streams. The fraction of total NO3− removal from water due to denitrification ranged from 0.5% to 100% among streams (median of 16%), and was related to NH4+ concentration and ecosystem respiration rate (ER). Multivariate approaches showed that the most important factors controlling SWden were specific discharge (discharge / width) and NO3− concentration (positive effects), and ER and transient storage zones (negative effects). The relationship between areal denitrification rate (Uden) and NO3− concentration indicated a partial saturation effect. A power function with an exponent of 0.5 described this relationship better than a Michaelis-Menten equation. Although Uden increased with increasing NO3− concentration, the efficiency of NO3− removal from water via denitrification declined, resulting in a smaller proportion of streamwater NO3− load removed over a given length of stream. Regional differences in stream denitrification rates were small relative to the proximate factors of NO3− concentration and ecosystem respiration rate, and land use was an important but indirect control on denitrification in streams, primarily via its effect on NO3− concentration.
    URI
    http://hdl.handle.net/1808/21013
    DOI
    https://doi.org/10.4319/lo.2009.54.3.0666
    Collections
    • Environmental Studies Scholarly Works [62]
    Citation
    Mulholland Patrick J. Hall Robert O. Sobota Daniel J. Dodds Walter K. Findlay Stuart E. G. Grimm Nancy B. Hamilton Stephen K. McDowell William H. O'Brien Jonathan M. Tank Jennifer L. Ashkenas Linda R. Cooper Lee W. Dahm Clifford N. Gregory Stanley V. Johnson Sherri L. Meyer Judy L. Peterson Bruce J. Poole Geoffrey C. Valett H. Maurice Webster Jackson R. Arango Clay P. Beaulieu Jake J. Bernot Melody J. Burgin Amy J. Crenshaw Chelsea L. Helton Ashley M. Johnson Laura T. Niederlehner B. R. Potter Jody D. Sheibley Richard W. Thomasn Suzanne M. , (2009), Nitrate removal in stream ecosystems measured by 15N addition experiments: Denitrification, Limnology and Oceanography, 54, doi: 10.4319/lo.2009.54.3.0666.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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