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dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDEIRMENDJIAN, Loris
dc.contributor.authorLOUSTAU, Denis
dc.contributor.authorLAFONT, Sébastien
dc.contributor.authorAUGUSTO, Laurent
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPOIRIER, Dominique
dc.contributor.authorCHIPEAUX, Christophe
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorABRIL, Gwenaël
dc.date.accessioned2024-05-13T12:53:25Z
dc.date.available2024-05-13T12:53:25Z
dc.date.issued2017-04-12
dc.identifier.issn1810-6277en_US
dc.identifier.urihttps://pub.orcid.org/v2.1/0000-0003-0338-8517/work/73332080
dc.identifier.urihttps://pub.orcid.org/v2.1/0000-0002-9605-8092/work/36520336
dc.identifier.urioai:crossref.org:10.5194/bg-2017-90
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199796
dc.description.abstractEnExport of soil carbon to superficial water through the drainage of groundwater is a significant but poorly documented component of the continental carbon budget. We monitored the concentrations of dissolved organic and inorganic carbon (DOC and DIC) in groundwaters and first order streams of a small temperate, forested and sandy watershed where hydrology occurs exclusively through drainage (no surface runoff). The studied watershed was also implemented for continuous measurements of groundwater table, precipitation, evapotranspiration, river discharge, and net ecosystem exchanges of sensible and latent heat fluxes as well as CO2. On a monthly basis, we found a good consistency between precipitation and the sum of evapotranspiration, drainage and groundwater storage. DOC and DIC temporary storage in groundwater and export to streams varied drastically during the hydrological cycle, the residence times of these two carbon forms varying from one month to several years. DOC concentrations in groundwater and streams were maximal at high water table and high stream discharge, when the water table reached the superficial organic rich layer of the soil. A large fraction of this winter DOC maximum was temporarily stored and further mineralized to DIC in the groundwater and only about 15 % was exported to streams during winter periods. In contrast, DIC, which was present in majority in the form of dissolved CO2 in groundwater and streams, was apparently diluted at high water table: DIC concentrations were maximum at low water table and low discharge in late summer and maximum pCO2 in groundwater corresponded to the late summer period of heterotrophic conditions (i.e., Reco>GPP). Groundwater DIC peaked in late summer and was followed by a rapid loss of excess CO2 from stream surface to the atmosphere. Overall, mean carbon export was 7.5 g C m-2 yr-1 (50 % as DOC and 50 % as DIC) and represented only 1.5 % of the NEE. About 65 % of the DIC exported from groundwaters returned to the atmosphere in the form of CO2 in first order streams.
dc.language.isoENen_US
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.sourceorcid
dc.sourcecrossref
dc.subject.enGroundwaters
dc.subject.enSoil
dc.subject.enNEE
dc.subject.enDOC
dc.subject.enDIC
dc.subject.enForest
dc.subject.enExport
dc.subject.enDegassing
dc.title.enHydrological and ecological controls on dissolved carbon concentrations in groundwater and carbon export to surface waters in a temperate pine forest watershed
dc.typeArticle de revueen_US
dc.identifier.doi10.5194/bg-2017-90en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalBiogeosciences Discussionsen_US
bordeaux.page1-34en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcedissemin
hal.identifierhal-04573565
hal.version1
hal.date.transferred2024-05-13T12:53:28Z
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exporttrue
workflow.import.sourcedissemin
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Biogeosciences%20Discussions&rft.date=2017-04-12&rft.spage=1-34&rft.epage=1-34&rft.eissn=1810-6277&rft.issn=1810-6277&rft.au=DEIRMENDJIAN,%20Loris&LOUSTAU,%20Denis&LAFONT,%20S%C3%A9bastien&AUGUSTO,%20Laurent&POIRIER,%20Dominique&rft.genre=article


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