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Examination of the parameters controlling the triple oxygen isotope composition of grass leaf water and phytoliths at a Mediterranean site: a model–data approach

hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
hal.structure.identifierUniversity of Almeria
dc.contributor.authorVOIGT, Claudia
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorALEXANDRE, Anne
hal.structure.identifierEcosystèmes continentaux et risques environnementaux [ECCOREV]
dc.contributor.authorREITER, Ilja
hal.structure.identifierInstitut méditerranéen de biodiversité et d'écologie marine et continentale [IMBE]
dc.contributor.authorORTS, Jean-Philippe
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorVALLET-COULOMB, Christine
hal.structure.identifierÉcotron Européen de Montpellier
dc.contributor.authorPIEL, Clément
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorMAZUR, Jean-Charles
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorALEMAN, Julie
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorSONZOGNI, Corinne
hal.structure.identifierCentre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement [CEREGE]
dc.contributor.authorMICHE, Helene
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
dc.date.accessioned2024-04-08T11:40:31Z
dc.date.available2024-04-08T11:40:31Z
dc.date.issued2023-06-15
dc.identifier.issn1726-4170
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195047
dc.description.abstractEnTriple oxygen isotopes (17O-excess) of water are useful to trace evaporation at the soil–plant–atmosphere interface. The 17O-excess of plant silica, i.e., phytoliths, inherited from leaf water, was previously calibrated in growth chambers as a proxy of atmospheric relative humidity (RH). Here, using a model–data approach, we examine the parameters that control the triple oxygen isotope composition of bulk grass leaf water and phytoliths in natura, at the O3HP experimental platform located in the French Mediterranean area. A grass plot was equipped to measure for 1 year, all environmental and plant physiological parameters relevant for modeling the isotope composition of the grass leaf water. In particular, the triple oxygen and hydrogen isotope composition of atmospheric water vapor above the grass was measured continuously using a cavity ring-down spectrometer, and the grass leaf temperature was monitored at plot scale using an infrared (IR) radiometer. Grass leaves were collected in different seasons of the year and over a 24 h period in June. Grass leaf water was extracted by cryogenic vacuum distillation and analyzed by isotope ratio mass spectrometry (IRMS). Phytoliths were analyzed by IR–laser fluorination–IRMS after chemical extraction. We showed that the traditional Craig–Gordon steady-state model modified for grass leaves reliably predicts the triple oxygen isotope composition of leaf water during daytime but is sensitive to uncertainties on the leaf-to-air temperature difference. Deviations from isotope steady state at night are well represented in the triple oxygen isotope system and predictable by a non-steady-state model. The 17O-excess of phytoliths confirms the applicability of the 17O-excessphyto vs. RH equation established in previous growth chamber experiments. Further, it recorded average daytime RH over the growth period rather than daily RH, related to low transpiration and silicification during the night. This model–data approach highlights the utility of the triple oxygen isotope system to improve the understanding of water exchange at the soil–plant–atmosphere interface. The in natura experiment underlines the applicability of 17O-excess of phytoliths as a RH proxy.
dc.description.sponsorshipDynamique passée de l'humidité atmosphérique continentale et de la végétation: apports de la triple composition isotopique de l'oxygène
dc.description.sponsorshipANAEE-Services - ANR-11-INBS-0001
dc.language.isoen
dc.publisherEuropean Geosciences Union
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enExamination of the parameters controlling the triple oxygen isotope composition of grass leaf water and phytoliths at a Mediterranean site: a model–data approach
dc.typeArticle de revue
dc.identifier.doi10.5194/bg-20-2161-2023
dc.subject.halSciences de l'environnement
bordeaux.journalBiogeosciences
bordeaux.page2161-2187
bordeaux.volume20
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue11
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-04304247
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04304247v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Biogeosciences&rft.date=2023-06-15&rft.volume=20&rft.issue=11&rft.spage=2161-2187&rft.epage=2161-2187&rft.eissn=1726-4170&rft.issn=1726-4170&rft.au=VOIGT,%20Claudia&ALEXANDRE,%20Anne&REITER,%20Ilja&ORTS,%20Jean-Philippe&VALLET-COULOMB,%20Christine&rft.genre=article


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