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    Stream denitrification across biomes and its response to anthropogenic nitrate loading

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    Author's draft (142.7Kb)
    Figure 1 (63.22Kb)
    Figure 2 (67.79Kb)
    Figure 3 (68.93Kb)
    Figure 4 (28.25Kb)
    Supplementary information (114.9Kb)
    Supplementary tables and figures (178.3Kb)
    Date
    2007-06-06
    Author
    Mulholland, Patrick J.  Concept link
    Helton, Ashley M.  Concept link
    Poole, Geoffrey C.  Concept link
    Hall, Robert O.  Concept link
    Hamilton, Stephen K.  Concept link
    Peterson, Bruce J.  Concept link
    Tank, Jennifer L.  Concept link
    Ashkenas, Linda R.  Concept link
    Cooper, Lee W.  Concept link
    Dahm, Clifford N.  Concept link
    Dodds, Walter K.  Concept link
    Findlay, Stuart E. G.  Concept link
    Gregory, Stanley V.  Concept link
    Grimm, Nancy B.  Concept link
    Johnson, Sherri L.  Concept link
    McDowell, William H.  Concept link
    Meyer, Judy L.  Concept link
    Valett, H. Maurice  Concept link
    Webster, Jackson R.  Concept link
    Arango, Clay P.  Concept link
    Beaulieu, Jake J.  Concept link
    Bernot, Melody J.  Concept link
    Burgin, Amy J.  Concept link
    Crenshaw, Chelsea L.  Concept link
    Johnson, Laura T.  Concept link
    Niederlehner, B. R.  Concept link
    O'Brien, Jonathan M.  Concept link
    Potter, Jody D.  Concept link
    Sheibley, Richard W.  Concept link
    Sobota, Daniel J.  Concept link
    Thomas, Suzanne M.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/2425
    As published
    https://doi.org/10.1038/nature06686
    Abstract
    Worldwide, anthropogenic addition of bioavailable nitrogen (N) to the biosphere is increasing and terrestrial ecosystems are becoming increasingly N saturated, causing more bioavailable N to enter groundwater and surface waters. Large-scale N budgets show that an average of about 20-25% of the N added to the biosphere is exported from rivers to the ocean or inland basins, indicating substantial sinks for N must exist in the landscape. Streams and rivers may be important sinks for bioavailable N owing to their hydrologic connections with terrestrial systems, high rates of biological activity, and streambed sediment environments that favor microbial denitrification. Here, using data from 15N tracer experiments replicated across 72 streams and 8 regions representing several biomes, we show that total biotic uptake and denitrification of nitrate increase with stream nitrate concentration, but that the efficiency of biotic uptake and denitrification declines as concentration increases, reducing the proportion of instream nitrate that is removed from transport. Total uptake of nitrate was related to ecosystem photosynthesis and denitrification was related to ecosystem respiration. Additionally, we use a stream network model to demonstrate that excess nitrate in streams elicits a disproportionate increase in the fraction of nitrate that is exported to receiving waters and reduces the relative role of small versus large streams as nitrate sinks.
    Description
    Author Posting. © The Author(s), 2008. This is the author's version of the work. It is posted here by permission of Nature Publishing Group for personal use, not for redistribution. The definitive version was published in Nature 452 (2008): 202-205, doi:10.1038/nature06686.
    Collections
    • Ecosystems Center
    Suggested Citation
    Preprint: Mulholland, Patrick J., Helton, Ashley M., Poole, Geoffrey C., Hall, Robert O., Hamilton, Stephen K., Peterson, Bruce J., Tank, Jennifer L., Ashkenas, Linda R., Cooper, Lee W., Dahm, Clifford N., Dodds, Walter K., Findlay, Stuart E. G., Gregory, Stanley V., Grimm, Nancy B., Johnson, Sherri L., McDowell, William H., Meyer, Judy L., Valett, H. Maurice, Webster, Jackson R., Arango, Clay P., Beaulieu, Jake J., Bernot, Melody J., Burgin, Amy J., Crenshaw, Chelsea L., Johnson, Laura T., Niederlehner, B. R., O'Brien, Jonathan M., Potter, Jody D., Sheibley, Richard W., Sobota, Daniel J., Thomas, Suzanne M., "Stream denitrification across biomes and its response to anthropogenic nitrate loading", 2007-06-06, https://doi.org/10.1038/nature06686, https://hdl.handle.net/1912/2425
     

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