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    Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces

    Access Status
    Fulltext not available
    Authors
    Zhu, G.
    Wang, S.
    Wang, W.
    Wang, Y.
    Zhou, L.
    Jiang, B.
    Op Den Camp, H.
    Risgaard-Petersen, N.
    Schwark, Lorenz
    Peng, Y.
    Hefting, M.
    Jetten, M.
    Yin, C.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhu, G. and Wang, S. and Wang, W. and Wang, Y. and Zhou, L. and Jiang, B. and Op Den Camp, H. et al. 2013. Hotspots of anaerobic ammonium oxidation at land-freshwater interfaces. Nature Geoscience. 6 (2): pp. 103-107.
    Source Title
    Nature Geoscience
    DOI
    10.1038/ngeo1683
    ISSN
    1752-0894
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/52584
    Collection
    • Curtin Research Publications
    Abstract

    For decades, the conversion of organic nitrogen to dinitrogen gas by heterotrophic bacteria, termed heterotrophic denitrification, was assumed to be the main pathway of nitrogen loss in natural ecosystems. Recently, however, autotrophic bacteria have been shown to oxidize ammonium in the absence of oxygen, yielding dinitrogen gas. This process, termed anammox, accounts for over 50% of nitrogen loss in marine ecosystems. However, the significance of anammox in freshwater ecosystems has remained uncertain. Here, we report the occurrence of anammox hotspots at land-freshwater interfaces of lake riparian zones in North China, using molecular and isotopic tracing technologies. Laboratory incubations measuring anammox activity at substrate concentrations no more than 10% of those observed in situ yielded some of the highest potential activities reported for natural environments to date. Potential rates of anammox peaked in sediments sampled from the interface between land and water, as did the abundance of annamox bacteria. Scaling our findings up to the entire lake system, we estimate that interfacial anammox hotspots account for the loss of 103 g Nm-2 yr-1 from this lake region, and around one fifth of the nitrogen lost from the land-water interface. © 2013 Macmillan Publishers Limited. All rights reserved.

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