{"refrec":{"BRefID":100632,"RR":"<b>Middelburg, J.J.; Klaver, G.; Nieuwenhuize, J.; Vlug, T.</b> (1995). Carbon and nitrogen cycling in intertidal sediments near Doel, Scheldt Estuary, <b><i>in</i></b>: Heip, C.H.R. <i>et al.</i> <i>Major biological processes in European tidal estuaries. Developments in Hydrobiology,</i> 110: pp. 57-69","BEntID":95837,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":", <b><i>in</i></b>: Heip, C.H.R. <i>et al.</i> <i>Major biological processes in European tidal estuaries. Developments in Hydrobiology,</i> 110: pp. 57-69","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Middelburg, J.J.; Klaver, G.; Nieuwenhuize, J.; Vlug, T.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Middelburg, J.J. <i>et al.</i>","Englishabstract":"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 ΣCO<sub>2</sub>, ammonium and nitrate. A comparison between chamber measured carbon dioxide fluxes and those based on ΣCO<sub>2</sub> 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 ΣCO<sub>2</sub> 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.</p><p>The annual amount of carbon delivered to the sediment is 42 mol m<sup>−2</sup>, 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<sup>−2</sup> of particulate nitrogen reaches the sediment; 1.1 mol m<sup>−2</sup> is buried and 1.6 mol m<sup>−2</sup> is mineralized to ammonium. Only 0.42 mol m<sup>−2</sup> yr<sup>−1</sup> of the ammonium produced escapes from the sediments, the remaining being first nitrified (1.2 mol m<sup>−2</sup> yr<sup>−1</sup>) and then denitrified (1.7 mol m<sup>−2</sup> yr<sup>−1</sup>). Simple calculations indicate that intertidal sediments may account for about 14% and 30% of the total estuarine retention of nitrogen and carbon, respectively.</p>","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"Carbon and nitrogen cycling in intertidal sediments near Doel, Scheldt Estuary","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1995,"MonPub":null,"DateUpdate":"2021-02-10","DateCreate":"2006-07-13","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":100632,"PubliDate":1995,"Pagination":"57-69","XtraPublOfAnaID":null,"ISBN":"978-0-7923-3699-0","Volume":"110","Issue":null,"BRefMon":100608,"BRefMonRR":"<b>Heip, C.H.R.; Herman, P.M.J. (Ed.)</b> (1995). 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