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Phosphorus behaviour at the groundwater-river water redox boundary

hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorANSCHUTZ, Pierre
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorRAPIN, Anne
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorDEIRMENDJIAN, Loris
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorMOREL, Christian
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorABRIL, Gwenaël
dc.date.accessioned2024-04-08T11:56:01Z
dc.date.available2024-04-08T11:56:01Z
dc.date.issued2015
dc.date.conference2015-02-22
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195729
dc.description.abstractEnThe importance of P-flux on aquatic ecosystems bears out the study of P dynamics in river catchments. Aqueous P geochemistry depends on biogeochemical processes and Fe geochemistry. Our study focused on P and Fe behaviour at the groundwater-river water boundary. We monitored the distribution of dissolved and particulate P and Fe in the Leyre river from order 0 streams to order 4 main-river. We also analysed porewaters from river bed sediments and from wells located in the two main land-use types (pine forest and corn field). We determined the particulate speciation of P using chemical extractions. The particulate-dissolved P exchange capacity was measured using in-vitro experiments and 32 P radioactivity. Results show that the studied catchment groundwaters supplied dissolved Fe and P with a high Fe/P ratio. Dissolved Fe was subjected to oxidative precipitation at the groundwater/river water interface. This oxidation was enhanced by aquatic plants. P was trapped on Fe(III) particles so much so that dissolved P remained at concentrations >0.2 µM. This means that the coastal river outlet receives particulate P, which can be solubilized after anoxic diagenetic processes.
dc.language.isoen
dc.subjectécosystèmes aquatiques
dc.subjectprocessus biogéochimiques
dc.subject.enphosphore
dc.subject.enbassins versants
dc.title.enPhosphorus behaviour at the groundwater-river water redox boundary
dc.typeCommunication dans un congrès
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.conference.title2015 Aquatic Sciences Meeting - Aquatic Sciences: Global and Regional Perspectives
bordeaux.countryES
bordeaux.conference.cityGranada
bordeaux.peerReviewedoui
hal.identifierhal-02792596
hal.version1
hal.invitednon
hal.conference.end2015-02-27
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02792596v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2015&rft.au=ANSCHUTZ,%20Pierre&RAPIN,%20Anne&DEIRMENDJIAN,%20Loris&MOREL,%20Christian&ABRIL,%20Gwena%C3%ABl&rft.genre=unknown


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