{"refrec":{"BRefID":349638,"RR":"<b>Lauryssen, F.; Crombé, P.; Maris, T.; Van Maldegem, E.; Van de Broek, M.; Temmerman, S.; Smolders, E.</b> (2022). Estimation of the natural background of phosphate in a lowland river using tidal marsh sediment cores. <i>Biogeosciences 19(3)</i>: 763-776. <a href=\"https://dx.doi.org/10.5194/bg-19-763-2022\" target=\"_blank\">https://dx.doi.org/10.5194/bg-19-763-2022</a>","BEntID":347333,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Biogeosciences 19(3)</i>: 763-776. <a href=\"https://dx.doi.org/10.5194/bg-19-763-2022\" target=\"_blank\">https://dx.doi.org/10.5194/bg-19-763-2022</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":0,"FreshFlag":1,"BrackishFlag":1,"TerrestrialFlag":0,"Authorstring":"Lauryssen, F.; Crombé, P.; Maris, T.; Van Maldegem, E.; Van de Broek, M.; Temmerman, S.; Smolders, E.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Lauryssen, F. <i>et al.</i>","Englishabstract":"Elevated phosphate (<span class=\"inline-formula\">PO<sub>4</sub></span>) concentrations can harm the ecological status in water by eutrophication. In the majority of surface waters in lowland regions such as Flanders (Belgium), the local <span class=\"inline-formula\">PO<sub>4</sub></span> levels exceed the limits defined by environmental policy and fail to decrease, despite decreasing total phosphorus (P) emissions. In order to underpin the definition of current limits, this study was set up to identify the pre-industrial background <span class=\"inline-formula\">PO<sub>4</sub></span> concentration in surface water of the Scheldt River, a tidal river in Flanders. We used the sedimentary records preserved in tidal marsh sediment cores as an archive for reconstructing historical changes in surface water <span class=\"inline-formula\">PO<sub>4</sub></span>. For sediment samples at sequential depths below the sediment surface, we dated the time of sediment deposition and analysed the extractable sediment P. The resulting time series of sediment P was linked to the time series of measured surface water-<span class=\"inline-formula\">PO<sub>4</sub></span> concentrations (data 1967–present). By combining those datasets, the sorption characteristics of the sediment could be described using a Langmuir-type sorption model. The calibrated sorption model allowed us to estimate a pre-industrial background surface water <span class=\"inline-formula\">PO<sub>4</sub></span> levels, based on deeper sediment P that stabilized at concentrations smaller than the modern. In three out of the four cores, the sediment P peaked around 1980, coinciding with the surface water <span class=\"inline-formula\">PO<sub>4</sub></span>. The estimated pre-industrial (<span class=\"inline-formula\">∼1800</span>) background <span class=\"inline-formula\">PO<sub>4</sub></span> concentration in the Scheldt River water was 62 [57; 66 (95 % CI)] <span class=\"inline-formula\">µg PO<sub>4</sub>-P L<sup>−1</sup></span>. That concentration exceeds the previously estimated natural background values in Flanders (15–35 <span class=\"inline-formula\">µg TP L<sup>−1</sup></span>) and is about half of the prevailing limit in the Scheldt River (120 <span class=\"inline-formula\">µg PO<sub>4</sub>-P L<sup>−1</sup></span>). In the 1930s, river water concentrations were estimated at 140 [128; 148] <span class=\"inline-formula\">µg PO<sub>4</sub>-P L<sup>−1</sup></span>, already exceeding the current limit. The method developed here proved useful for reconstructing historical background <span class=\"inline-formula\">PO<sub>4</sub></span> concentrations of a lowland tidal river. A similar approach can apply to other lowland tidal rivers to provide a scientific basis for local catchment-specific <span class=\"inline-formula\">PO<sub>4</sub></span> backgrounds.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Estimation of the natural background of phosphate in a lowland river using tidal marsh sediment cores","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":2022,"MonPub":null,"DateUpdate":"2022-02-21","DateCreate":"2022-02-14","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000758092100001","VABBcode":null,"OpenAcc":1,"DOI":"10.5194/bg-19-763-2022"},"refs":null,"anarec":{"AnaID":349638,"PubliDate":2022,"Pagination":"763-776","XtraPublOfAnaID":null,"ISBN":null,"Volume":"19","Issue":"3","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":68092,"SerRR":"<b>Gattuso, J.P.; Kesselmeier, J. (Ed.)</b> Biogeosciences. Copernicus Publications: Göttingen.  ISSN 1726-4170; e-ISSN 1726-4189","StandardTitleSer":"Biogeosciences","ISSN":"1726-4170","AbbrevSer":"Biogeosciences","StandardTitleMon":null,"StartPage":763,"Pages":14,"ToPubliDate":null,"BRefBibLvlCode":"S","SerNotes":null},"monrec":null,"serrec":null,"relations":null,"relationsRev":null,"addrec":null,"othpubs":null,"ownerships":null,"authors":[{"AutName":"Lauryssen","Firstname":"Florian","Initials":"F.","Affiliation":"Division of Soil and Water Management, Department of Earth and Environmental Sciences, KU Leuven","Discriminator":null,"CorporateFlag":0,"BEntID":347333,"AutID":479251,"OrderNr":1,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":null,"InsFSN":"KU Leuven; Afdeling Bodem- en Waterbeheer","ORCID":"0000-0002-9701-5078","PersID":40899,"InsID":2060},{"AutName":"Crombé","Firstname":"Philippe","Initials":"P.","Affiliation":"Department of Archaeology, Ghent University","Discriminator":null,"CorporateFlag":0,"BEntID":347333,"AutID":456202,"OrderNr":2,"DegrID":null,"EditorFlag":0,"CorrespFlag":0,"IllustratorFlag":0,"ReviserFlag":0,"TranslatorFlag":0,"InsAcronym":"ARCHAEO","InsFSN":"Universiteit Gent; 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