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Differences between tree stem CO 2 efflux and O 2 influx rates cannot be explained by internal CO 2 transport or storage in large beech trees

hal.structure.identifierMax Planck Institute for Biogeochemistry [MPI-BGC]
hal.structure.identifierUniversité de Bâle = University of Basel = Basel Universität [Unibas]
dc.contributor.authorHELM, Juliane
hal.structure.identifierUniversidad Politécnica de Madrid [UPM]
hal.structure.identifierUniversiteit Gent = Ghent University = Université de Gand [UGENT]
dc.contributor.authorSALOMÓN, Roberto
hal.structure.identifierMax Planck Institute for Biogeochemistry [MPI-BGC]
dc.contributor.authorHILMAN, Boaz
hal.structure.identifierMax Planck Institute for Biogeochemistry [MPI-BGC]
hal.structure.identifierGeorg-August-University = Georg-August-Universität Göttingen
dc.contributor.authorMUHR, Jan
hal.structure.identifierGeorg-August-University = Georg-August-Universität Göttingen
dc.contributor.authorKNOHL, Alexander
hal.structure.identifierUniversiteit Gent = Ghent University = Université de Gand [UGENT]
dc.contributor.authorSTEPPE, Kathy
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorGIBON, Yves
hal.structure.identifierBiologie du fruit et pathologie [BFP]
dc.contributor.authorCASSAN, Cédric
hal.structure.identifierMax Planck Institute for Biogeochemistry [MPI-BGC]
dc.contributor.authorHARTMANN, Henrik
dc.date.issued2023-05-23
dc.identifier.issn0140-7791
dc.description.abstractEnTree stem respiration (R S) is a substantial component of the forest carbon balance. The mass balance approach uses stem CO 2 efflux and internal xylem fluxes to sum up R S , while the oxygen-based method assumes O 2 influx as a proxy of R S. So far, both approaches have yielded inconsistent results regarding the fate of respired CO 2 in tree stems, a major challenge for quantifying forest carbon dynamics. We collected a data set of CO 2 efflux, O 2 influx, xylem CO 2 concentration, sap flow, sap pH, stem temperature, nonstructural carbohydrates concentration and potential phosphoenolpyruvate carboxylase (PEPC) capacity on mature beech trees to identify the sources of differences between approaches. The ratio of CO 2 efflux to O 2 influx was consistently below unity (0.7) along a 3-m vertical gradient, but internal fluxes did not bridge the gap between influx and efflux, nor did we find evidence for changes in respiratory substrate use. PEPC capacity was comparable with that previously reported in green current-year twigs. Although we could not reconcile differences between approaches, results shed light on the uncertain fate of CO 2 respired by parenchyma cells across the sapwood. Unexpected high values of PEPC
dc.language.isoen
dc.publisherWiley
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enCO2/O2 ratio
dc.subject.encarbon dioxide transport
dc.subject.enmature trees
dc.subject.enoxygen consumption
dc.subject.entemperate forest
dc.subject.envertical stem gradient.
dc.title.enDifferences between tree stem CO 2 efflux and O 2 influx rates cannot be explained by internal CO 2 transport or storage in large beech trees
dc.typeArticle de revue
dc.identifier.doi10.1111/pce.14614
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
dc.description.sponsorshipEurope682512-OXYFLUX
bordeaux.journalPlant, Cell and Environment
bordeaux.volumeOnline first
bordeaux.peerReviewedoui
hal.identifierhal-04121662
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04121662v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Plant,%20Cell%20and%20Environment&rft.date=2023-05-23&rft.volume=Online%20first&rft.eissn=0140-7791&rft.issn=0140-7791&rft.au=HELM,%20Juliane&SALOM%C3%93N,%20Roberto&HILMAN,%20Boaz&MUHR,%20Jan&KNOHL,%20Alexander&rft.genre=article


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