{"refrec":{"BRefID":142105,"RR":"<b>Gribsholt, B.; Struyf, E.; Tramper, A.; Andersson, M.G.I.; Brion, N.; De Brabandere, L.; Van Damme, S.; Meire, P.; Middelburg, J.J.; Dehairs, F.A.; Boschker, H.T.S.</b> (2006). Ammonium transformation in a nitrogen-rich tidal freshwater marsh. <i>Biogeochemistry 80(3)</i>: 289-298","BEntID":135353,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeochemistry 80(3)</i>: 289-298","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gribsholt, B.; Struyf, E.; Tramper, A.; Andersson, M.G.I.; Brion, N.; De Brabandere, L.; Van Damme, S.; Meire, P.; Middelburg, J.J.; Dehairs, F.A.; Boschker, H.T.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gribsholt, B. <i>et al.</i>","Englishabstract":"The fate and transport of watershedderived ammonium in a tidal freshwater marsh fringing the nutrient rich Scheldt River, Belgium, was quantified in a whole ecosystem <sup>15</sup>N labeling experiment. In late summer (September) we added <sup>15</sup>N-NH<sub>4</sub><sup>+</sup> to the flood water entering a 3477 m<sup>2</sup> tidal freshwater marsh area, and traced the ammonium processing and retention in four subsequent tide cycles. In this paper we present the results for the water-phase components of the marsh system and compare them to a similar experiment conducted in spring/early summer (May). Changes in concentration and isotopic enrichment of NO<sub>3</sub><sup>-</sup>  + NO<sub>2</sub><sup>-</sup>, N<sub>2</sub>O, N<sub>2</sub>, NH<sub>4</sub><sup>+</sup> andsuspended particulate nitrogen (SPN) were measured in concert with a mass balance study. All analyzed N-pools were labeled, and 49% of the added <sup>15</sup>NH<sub>4</sub><sup>+</sup> was retained or transformed. The most important pool for <suP>15</sup>N was nitrate, accounting for 17% of <sup>15</sup>N-transformation. N<sub>2</sub>, N<sub>2</sub>O and SPN accounted for 2.4, 0.02 and 1.4%, respectively. The temporal and spatial patterns of <sup>15</sup>N transformation in the water phase component of the system were remarkably similar to those observed in May, indicating good reproducibility of the whole ecosystem labeling approach, but the absolute ammonium transformation rate was 3 times higher in May. While the marsh surface area was crucial for nitrification in May this was less pronounced in September. Denitrification, on the other hand, appeared more important in September compared to May.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Ammonium transformation in a nitrogen-rich tidal freshwater marsh","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:32:52.928458","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2006,"MonPub":null,"DateUpdate":"2014-01-27","DateCreate":"2009-11-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000240980300008","VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":142105,"PubliDate":2006,"Pagination":"289-298","XtraPublOfAnaID":null,"ISBN":null,"Volume":"80","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45092,"SerRR":"Biogeochemistry. Springer: Dordrecht; Lancaster; Boston.  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