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Evidence for distinct isotopic compositions of sap and tissue water in tree stems: consequences for plant water source identification

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorBARBETA, Adrià
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Régis
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorMARTÍN‐GÓMEZ, Paula
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorFRÉJAVILLE, Bastien
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDEVERT, Nicolas
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWINGATE, Lisa
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorDOMEC, Jean‐Christophe
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
dc.date.accessioned2024-04-08T11:49:43Z
dc.date.available2024-04-08T11:49:43Z
dc.date.issued2021-12-03
dc.identifier.issn0028-646X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195352
dc.description.abstractEnThe long-standing hypothesis that the isotopic composition of plant stem water reflects that of source water is being challenged by studies reporting bulk water from woody stems with an isotopic composition that cannot be attributed to any potential water source. The mechanism behind such source-stem water isotopic offsets is still poorly understood. Using a novel technique to extract selectively sap water from xylem conduits, we show that, in cut stems and potted plants, the isotopic composition of sap water reflects that of irrigation water, demonstrating unambiguously that no isotopic fractionation occurs during root water uptake or sap water extraction. By contrast, water in nonconductive xylem tissues is always depleted in deuterium compared with sap water, irrespective of wood anatomy. Previous studies have shown that isotopic heterogeneity also exists in soils at the pore scale in which water adsorbed onto soil particles is more depleted in deuterium than unbound water. Data collected at a riparian forest indicated that sap water matches best unbound soil water from depth below −70 cm, while bulk stem and soil water differ markedly. We conclude that source-stem isotopic offsets can be explained by micrometre-scale heterogeneity in the isotope ratios of water within woody stems and soil micro-pores.
dc.description.sponsorshipInitiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
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 - ANR-13-BS06-0005
dc.language.isoen
dc.publisherWiley
dc.rights.urihttp://creativecommons.org/licenses/by-nc/
dc.subject.enadsorbed water
dc.subject.enecohydrology
dc.subject.enplant water relations
dc.subject.enroot water uptake
dc.subject.enstable isotopes
dc.title.enEvidence for distinct isotopic compositions of sap and tissue water in tree stems: consequences for plant water source identification
dc.typeArticle de revue
dc.identifier.doi10.1111/nph.17857
dc.subject.halSciences de l'environnement
bordeaux.journalNew Phytologist
bordeaux.page1-12
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03476573
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03476573v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=New%20Phytologist&rft.date=2021-12-03&rft.spage=1-12&rft.epage=1-12&rft.eissn=0028-646X&rft.issn=0028-646X&rft.au=BARBETA,%20Adri%C3%A0&BURLETT,%20R%C3%A9gis&MART%C3%8DN%E2%80%90G%C3%93MEZ,%20Paula&FR%C3%89JAVILLE,%20Bastien&DEVERT,%20Nicolas&rft.genre=article


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