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Carbon and nitrogen cycling in intertidal sediments near Doel, Scheldt Estuary
Middelburg, J.J.; Klaver, G.; Nieuwenhuize, J.; Vlug, T. (1995). Carbon and nitrogen cycling in intertidal sediments near Doel, Scheldt Estuary. Hydrobiologia 311(1-3): 57-69. https://dx.doi.org/10.1007/BF00008571
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158; e-ISSN 1573-5117, meer
Is gerelateerd aan:
Middelburg, J.J.; Klaver, G.; Nieuwenhuize, J.; Vlug, T. (1995). Carbon and nitrogen cycling in intertidal sediments near Doel, Scheldt Estuary, in: Heip, C.H.R. et al. Major biological processes in European tidal estuaries. Developments in Hydrobiology, 110: pp. 57-69, meer
Peer reviewed article  

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Trefwoorden
    Chemical compounds > Carbon compounds > Atmospheric gases > Carbon dioxide
    Chemical compounds > Organic compounds > Hydrocarbons > Saturated hydrocarbons > Acyclic hydrocarbons > Methane
    Chemical compounds > Oxygen compounds > Oxides > Nitrogen compounds > Nitrous oxide
    Chemistry > Geochemistry > Sediment chemistry
    Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle
    Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles > Carbon cycle
    Cycles > Chemical cycles > Geochemical cycle > Biogeochemical cycle > Nutrient cycles > Nitrogen cycle
    Environments > Aquatic environment > Marine environment > Intertidal environment
    Estuarine chemistry
    Mineralization
    Organic matter > Carbon > Organic carbon
    Sedimentary structures > Mud flats
    Water bodies > Coastal waters > Coastal landforms > Coastal inlets > Estuaries
    België, Zeeschelde, Doel [Marine Regions]
    Marien/Kust; Brak water

Auteurs  Top 
  • Middelburg, J.J., meer
  • Klaver, G.
  • Nieuwenhuize, J.
  • Vlug, T.

Abstract
    Carbon and nitrogen cycling in intertidal mud flat sediments in the Scheldt Estuary was studied using measurements of carbon dioxide, methane and nitrous oxide emission rates and pore-water profiles of ΣCO2, ammonium and nitrate. A comparison between chamber measured carbon dioxide fluxes and those based on ΣCO2 pore-water gradients using Fick's First law indicates that apparent diffusion coefficients are 2 to 28 times higher than bulk sediment diffusion coefficients based on molecular diffusion. Seasonal changes in gaseous carbon fluxes or ΣCO2 pore water concentrations cannot be used directly, or in a simple way, to determine seasonal rates of mineralization, because of marked seasonal changes in pore-water storage and exchange parameters.

    The annual amount of carbon delivered to the sediment is 42 mol m−2, of which about 42% becomes buried, the remaining being emitted as methane (7%) or carbon dioxide (50%). Each year about 2.6 mol N m−2 of particulate nitrogen reaches the sediment; 1.1 mol m−2 is buried and 1.6 mol m−2 is mineralized to ammonium. Only 0.42 mol m−2 yr−1 of the ammonium produced escapes from the sediments, the remaining being first nitrified (1.2 mol m−2 yr−1) and then denitrified (1.7 mol m−2 yr−1). Simple calculations indicate that intertidal sediments may account for about 14% and 30% of the total estuarine retention of nitrogen and carbon, respectively.


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