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An explanation for the isotopic offset between soil and stem water in a temperate tree species

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierUniversitat de Barcelona [UB]
dc.contributor.authorBARBETA, Adrià
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierIkerbasque - Basque Foundation for Science
dc.contributor.authorGIMENO, Teresa
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorCLAVÉ, Laura
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorFRÉJAVILLE, Bastien
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorJONES, Sam
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDELVIGNE, Camille
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWINGATE, Lisa
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
dc.date.accessioned2024-04-08T11:52:03Z
dc.date.available2024-04-08T11:52:03Z
dc.date.issued2020-08
dc.identifier.issn0028-646X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195465
dc.description.abstractEnA growing number of field studies report isotopic offsets between stem water and its potential sources that prevent the unambiguous identification of plant water origin using water isotopes. We explored the causes of this isotopic offset by conducting a controlled experiment on the temperate tree species Fagus sylvatica.We measured delta H-2 and delta O-18 of soil and stem water from potted saplings growing on three soil substrates and subjected to two watering regimes.Regardless of substrate, soil and stem water delta H-2 were similar only near permanent wilting point. Under moister conditions, stem water delta H-2 was 11 +/- 3 parts per thousand more negative than soil water delta H-2, coherent with field studies. Under drier conditions, stem water delta H-2 became progressively more enriched than soil water delta H-2. Although stem water delta O-18 broadly reflected that of soil water, soil-stem delta H-2 and delta O-18 differences were correlated (r = 0.76) and increased with transpiration rates indicated by proxies.Soil-stem isotopic offsets are more likely to be caused by water isotope heterogeneities within the soil pore and stem tissues, which would be masked under drier conditions as a result of evaporative enrichment, than by fractionation under root water uptake. Our results challenge our current understanding of isotopic signals in the soil-plant continuum.
dc.description.sponsorshipCOntinental To coastal Ecosystems: evolution, adaptability and governance - ANR-10-LABX-0045
dc.description.sponsorshipEtude des mécanismes de régulation de l'anhydrase carbonique et des flux de COS et CO18O dans les écosystèmes terrestres
dc.language.isoen
dc.publisherWiley
dc.subject.enplant water sources
dc.subject.enroot water uptake
dc.subject.enwater isotopes
dc.subject.enecohydrology
dc.subject.enFagus sylvatica
dc.title.enAn explanation for the isotopic offset between soil and stem water in a temperate tree species
dc.typeArticle de revue
dc.identifier.doi10.1111/nph.16564
dc.subject.halSciences de l'environnement
bordeaux.journalNew Phytologist
bordeaux.page766-779
bordeaux.volume227
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue3
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03187004
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03187004v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=New%20Phytologist&rft.date=2020-08&rft.volume=227&rft.issue=3&rft.spage=766-779&rft.epage=766-779&rft.eissn=0028-646X&rft.issn=0028-646X&rft.au=BARBETA,%20Adri%C3%A0&GIMENO,%20Teresa&CLAV%C3%89,%20Laura&FR%C3%89JAVILLE,%20Bastien&JONES,%20Sam&rft.genre=article


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