{"refrec":{"BRefID":217480,"RR":"<b>Gribsholt, B.; Veuger, B.; Tramper, A.; Middelburg, J.J.; Boschker, H.T.S.</b> (2009). Long-term <sup>15</sup>N-nitrogen retention in tidal freshwater marsh sediment: elucidating the microbial contribution. <i>Limnol. Oceanogr. 54(1)</i>: 13-22. <a href=\"https://dx.doi.org/10.4319/lo.2009.54.1.0013\" target=\"_blank\">https://dx.doi.org/10.4319/lo.2009.54.1.0013</a>","BEntID":209226,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":0,"RefStringPartII":". <i>Limnol. Oceanogr. 54(1)</i>: 13-22. <a href=\"https://dx.doi.org/10.4319/lo.2009.54.1.0013\" target=\"_blank\">https://dx.doi.org/10.4319/lo.2009.54.1.0013</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Gribsholt, B.; Veuger, B.; Tramper, A.; Middelburg, J.J.; Boschker, H.T.S.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Gribsholt, B. <i>et al.</i>","Englishabstract":"The long-term retention of nitrogen in sediment of a tidal freshwater marsh in the Scheldt estuary (Belgium) was investigated by an in situ <sup>15</sup>N-labeling experiment. Sediment of an unvegetated creek bank and sediment vegetated by common reed (<em>Phragmites australis</em>) were labeled with <sup>15</sup>NN-enriched NH<sub>4</sub><sup>+</sup> after which <sup>15</sup>N was traced into pore-water dissolved NH<sub>4</sub><sup>+</sup>, NO<sub>3</sub><sup>-</sup>, and N<sub>2</sub>; plant roots and leaves; and bulk sediment over a 1-yr period. Label retention in the sediment organic matter was further characterized by analyzing KCl-extracted sediment and hydrolyzable amino acids (including the bacterial biomarker D-alanine). Within weeks all added <sup>15</sup>NH<sub>4</sub><sup>+</sup> was transformed and/or assimilated by the biota. Between 42% and 48% of the added label was recovered in plants, root, and sediment (collectively) after 3?6 months, whereas 24% remained after 1 yr. Transfer to plants and roots was rapid and although retention in leaves was transient, the <sup>15</sup>N assimilated by roots was retained for the entire 1-yr period. Root assimilation could account for 12?23% of the <sup>15</sup>N retained in vegetated plots. The majority of <sup>15</sup>N was retained in the organic matter pool within the sediment (represented by <sup>15</sup>N in the KCl extracted sediment and total hydrolyzable amino acids), primarily through efficient recycling of the <sup>15</sup>N within the microbial community. <sup>15</sup>N incorporation into D-alanine confirmed that bacteria were the major group of microorganisms responsible for the strong retention of <sup>15</sup>N. This study shows the strong potential of reed roots and especially bacteria to retain nitrogen in tidal freshwater sediment over longer periods of time.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Long-term <sup>15</sup>N-nitrogen retention in tidal freshwater marsh sediment: elucidating the microbial contribution","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-04-23 01:32:15.332024","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2009,"MonPub":null,"DateUpdate":"2022-02-09","DateCreate":"2012-08-20","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000265168800002","VABBcode":null,"OpenAcc":0,"DOI":"10.4319/lo.2009.54.1.0013"},"refs":null,"anarec":{"AnaID":217480,"PubliDate":2009,"Pagination":"13-22","XtraPublOfAnaID":null,"ISBN":null,"Volume":"54","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43511,"SerRR":"Limnology and Oceanography. 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