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  • Intensive and extensive nitrogen loss from intertidal permeable sediments of the Wadden Sea [Elektronski vir]
    Gao, Hang ...
    Nitrogen (N) loss rates were determined in permeable sediments of the Wadden Sea using a combination ofstable N isotope incubation experiments and model simulation approaches during three seasons. ... Three differentincubation methods that employed the isotope pairing technique were used: intact core incubations simulatingeither (1) diffusive or (2) advective transport conditions and (3) slurry incubations. N loss rates from coreincubations under simulated advective transport conditions exceeded those rates measured under diffusivetransport conditions by 1–2 orders of magnitude, but were comparable to those observed in slurry incubations. Nloss rates generally showed little seasonal and spatial variation (207630mmol m22h21) in autumn 2006 andspring and summer 2007. Utilizing an extensive time series of nutrient concentrations and current velocitiesobtained from a continuous monitoring station, nitrate and nitrite (i.e., NO{x) flux into the sediment was modeledover a full annual cycle. Fluxes were sufficient to support the experimentally derived N loss rates. Combining themeasured rates with the modeled results, an annual N removal rate of 7456109 mmol N m22yr21was estimatedfor permeable sediments of the Wadden Sea. This rate agrees well with previous N loss estimates for the WaddenSea based on N budget calculations. Permeable sediments, accounting for 58–70%of the continental shelf area,are an important N sink and their contribution to the global N loss budget should be reevaluated
    Source: Limnology and oceanography [Elektronski vir]. - ISSN 1939-5590 (Vol. 57, issue 1, 2012, str. 185-198)
    Type of material - e-article ; adult, serious
    Publish date - 2012
    Language - english
    COBISS.SI-ID - 178156035

    Link(s):

    https://aslopubs.onlinelibrary.wiley.com/doi/epdf/10.4319/lo.2012.57.1.0185
    DOI

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