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High fluvial export of dissolved organic nitrogen from a peatland catchment with elevated inorganic nitrogen deposition

Edokpa, D.A., Evans, M.G., Rothwell, J.J

Science of the Total Environment. 2015;532:711-722.

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    Abstract

    This study investigates seasonal concentrations and fluxes of nitrogen (N) species under stormflow and baseflow conditions in the peat dominated Kinder River catchment, south Pennines, UK. This upland region has experienced decades of high atmospheric inorganic N deposition. Water samples were collected fortnightly over one year, in combination with high resolution stormflow sampling and discharge monitoring. The results reveal that dissolved organic nitrogen (DON) constitutes ~ 54% of the estimated annual total dissolved nitrogen (TDN) flux (14.3 kg N ha− 1 yr− 1). DON cycling in the catchment is influenced by hydrological and biological controls, with greater concentrations under summer stormflow conditions. Dissolved organic carbon (DOC) and DON are closely coupled, with positive correlations observed during spring, summer and autumn stormflow conditions. A low annual mean DOC:DON ratio (< 25) and elevated dissolved inorganic N concentrations (up to 63 ĂŽÂĽmol l− 1 in summer) suggest that the Kinder catchment is at an advanced stage of N saturation. This study reveals that DON is a significant component of TDN in peatland fluvial systems that receive high atmospheric inputs of inorganic N.

    Bibliographic metadata

    Type of resource:
    Content type:
    Publication status:
    Published
    Publication type:
    Publication form:
    Published date:
    Accepted date:
    2015-06-19
    Submitted date:
    2015-02-26
    Language:
    eng
    Abbreviated journal title:
    ISSN:
    Publisher:
    Volume:
    532
    Start page:
    711
    End page:
    722
    Total:
    11
    Pagination:
    711-722
    Digital Object Identifier:
    doi:10.1016/j.scitotenv.2015.06.072
    Related website(s):
    • Toll free PDF download until 14/08/15 http://authors.elsevier.com/a/1RG6OB8ccV44O
    Attached files Open Access licence:
    Publishers licence
    Attached files embargo period:
    Other
    Attached files release date:
    25th June, 2017
    Access state:
    Active

    Institutional metadata

    University researcher(s):

    Record metadata

    Manchester eScholar ID:
    uk-ac-man-scw:267413
    Created by:
    Kneen, Sarah
    Created:
    26th June, 2015, 12:09:45
    Last modified by:
    Rothwell, James
    Last modified:
    18th November, 2015, 08:16:54

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