{"refrec":{"BRefID":16100,"RR":"<b>Van Raaphorst, W.; Kloosterhuis, H.T.; Berghuis, E.M.; Gieles, A.J.M.; Malschaert, J.F.P.; Van Noort, G.J.</b> (1992). Nitrogen cycling in two types of sediments of the southern North Sea (Frisian front, Broad Fourteens): field data and mesocosm results. <i>Neth. J. Sea Res. 28(4)</i>: 293-316","BEntID":16100,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Neth. J. Sea Res. 28(4)</i>: 293-316","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Van Raaphorst, W.; Kloosterhuis, H.T.; Berghuis, E.M.; Gieles, A.J.M.; Malschaert, J.F.P.; Van Noort, G.J.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Van Raaphorst, W. <i>et al.</i>","Englishabstract":"Benthic nitrogen cycling was examined at a sandy station (Broad Fourteens, B14) and at a silty station (Frisian Front, FF) in the southern North Sea. Both stations are shallow (B14: 29 m, FF: 39 m) and had a vertically well-mixed water column throughout the period of investigation (January 1989 to April 1990). Both 0<sub>2</sub> consumption and NH<sub>4</sub> <sup>+</sup> release were maximal during the summer, their rates at B14 were 20 and 0.5 mmol·m<sup>-2</sup>·d<sup>-1</sup>, respectively, and at FF, 40 and 1.7 mmol·m<sup>-2</sup>·d<sup>-1</sup>, respectively. At B14, NO<sub>x</sub> (nitrate + nitrite) fluxes were directed into the sediment during the first half of 1989 while an efflux was measured from August onwards. At FF, an efflux of NO<sub>x</sub> was observed throughout the year, though at very low rates during the period January-June. Maximum denitrification rates were measured during April and June, while minimum rates were observed in August and November. On an annual basis, at B14 ~50% and at FF ~85% of the ammonium produced by benthic mineralization was regenerated to the water column. Consequently, the N retention in the sediment (denitrification and burial), as a percentage of ammonification, was lower at the silty FF than at the sandy B14. It is argued that this is probably caused by lower O<sub>2</sub> availability due to higher mineralization rates and consequently lower nitrification rates at FF as compared to the organic-poor B14. Benthic nitrification supplied more than 85% of the N0<sub>3</sub><sup>-</sup> annually needed for denitrification, thus demonstrating the importance of nitrification-denitrification coupling in these sediments. Parallel to the field measurements, the effect of a single addition of <i>Phaeocystis</i> material to the B14 and FF sediments was studied in mesocosms. Oxygen respiration strongly increased directly after addition of this organic substrate but after ~1 month, respiration decreased to values lower than before food addition. This pattern could be described with a simple multi-G model (n=3). Directly after the supply of organic matter to the mesocosms, nitrate concentrations in the pore water and denitrification rates substantially decreased. After ~2 months when most of the added material was respired, both nitrate concentrations and denitrification recovered.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Nitrogen cycling in two types of sediments of the southern North Sea (Frisian front, Broad Fourteens): field data and mesocosm results","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":1992,"MonPub":null,"DateUpdate":"2001-09-17","DateCreate":"2001-08-20","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":16100,"PubliDate":1992,"Pagination":"293-316","XtraPublOfAnaID":null,"ISBN":null,"Volume":"28","Issue":"4","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":44573,"SerRR":"Netherlands Journal of Sea Research. 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