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Sampling terrigenous diffuse sources in watercourse: Influence of land use and hydrological conditions on dissolved organic matter characteristics

dc.rights.licenseopenen_US
hal.structure.identifierRiverLy - Fonctionnement des hydrosystèmes [RiverLy]
dc.contributor.authorBOUKRA, Amine
hal.structure.identifierRiverLy - Fonctionnement des hydrosystèmes [RiverLy]
dc.contributor.authorMASSON, Matthieu
hal.structure.identifierRiverLy - Fonctionnement des hydrosystèmes [RiverLy]
dc.contributor.authorBROSSE, Corinne
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSOURZAC, Mahaut
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPARLANTI, Edith
hal.structure.identifierRiverLy - Fonctionnement des hydrosystèmes [RiverLy]
dc.contributor.authorMIÈGE, Cécile
dc.date.accessioned2024-03-08T13:11:53Z
dc.date.available2024-03-08T13:11:53Z
dc.date.issued2023
dc.identifier.issn0048-9697en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/188648
dc.description.abstractEnDiffuse and point sources of dissolved organic matter (DOM) in streams influence its composition, interactions and fate in the aquatic ecosystem. These inputs can be very numerous at the scale of a watershed, and their identification remains a challenge, especially for diffuse sources related to land use. The complexity of the transfer mechanisms and the reactivity of DOM throughout the soil-water column continuum raise questions about the sampling of diffuse sources in watercourses. To answer this issue, we compared the characteristics of soil-extracted DOM influenced by a particular land use (homogenous sub-catchment of forest and vineyard) and DOM collected from the watercourse adjacent to the soil samples. A 28-day incubation experiment of soil extracts was designed to remove the labile fraction of DOM. During the first 3 days, between 40 and 70 %of the DOC mass was lost for both types of soils. A set of optical indicators (UV–Visible, EEM fluorescence and HPSEC/UV-fluorescence) showed that the labile fraction was mostly composed by low (10 kDa) protein-like molecules. At the end of the incubation, soil-extracted DOMwas mainly composed of medium molecules (1–10 kDa) associated to terrigenous humic-like compounds. Its optical and size molecular signature tended towards that in the adjacent watercourses and was specific to land use.However, the characteristics of DOMin watercourses was also influenced by the hydrological conditions, probably due to a transfer of top soil DOM during high water periods and both deep soil and autochthonous DOM during low water periods. These results were obtained by a set of indicators, including novel ones derived from HPSEC/UV-fluorescence. Finally, this study demonstrated that it is possible to sample the DOM representative of a land use directly in the river downstream of the homogeneous sub-basin by multiplying the samples during contrasting hydrological conditions.
dc.description.sponsorshipApproche intégrée biogéochimique, géographique et hydrologique pour déterminer les sources de contaminants sur des bassins versants d'usage mixte - ANR-21-CE34-0013en_US
dc.language.isoENen_US
dc.subject.enDissolved organic matter
dc.subject.enNon-point sources
dc.subject.enLand-use
dc.subject.enOptical fingerprint
dc.title.enSampling terrigenous diffuse sources in watercourse: Influence of land use and hydrological conditions on dissolved organic matter characteristics
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.scitotenv.2023.162104en_US
dc.subject.halSciences de l'environnementen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimieen_US
bordeaux.journalScience of the Total Environmenten_US
bordeaux.page162104en_US
bordeaux.volume872en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamLPTCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-04286276
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Science%20of%20the%20Total%20Environment&rft.date=2023&rft.volume=872&rft.spage=162104&rft.epage=162104&rft.eissn=0048-9697&rft.issn=0048-9697&rft.au=BOUKRA,%20Amine&MASSON,%20Matthieu&BROSSE,%20Corinne&SOURZAC,%20Mahaut&PARLANTI,%20Edith&rft.genre=article


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