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Isotopic offsets between bulk plant water and its sources are larger in cool and wet environments

hal.structure.identifierBasque Centre for Climate Change [BC3]
hal.structure.identifierCREAF - Centre for Ecological Research and Applied Forestries
dc.contributor.authorDE LA CASA, Javier
hal.structure.identifierUniversity of Barcelona
dc.contributor.authorBARBETA, Adrià
hal.structure.identifierBasque Centre for Climate Change [BC3]
dc.contributor.authorRODRÍGUEZ-UÑA, Asun
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWINGATE, Lisa
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
hal.structure.identifierCREAF - Centre for Ecological Research and Applied Forestries
hal.structure.identifierBasque Centre for Climate Change [BC3]
dc.contributor.authorGIMENO, Teresa
dc.date.accessioned2024-04-08T11:46:02Z
dc.date.available2024-04-08T11:46:02Z
dc.date.issued2022-08-08
dc.identifier.issn1027-5606
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195223
dc.description.abstractEnIsotope-based approaches to study plant water sources rely on the assumption that root water uptake and within-plant water transport are non-fractionating processes. However, a growing number of studies have reported offsets between plant and source water stable isotope composition for a wide range of ecosystems. These isotopic offsets can result in the erroneous attribution of source water used by plants and potential overestimations of groundwater uptake by the vegetation. We conducted a global meta-analysis to quantify the magnitude of these plant source water isotopic offsets and explored whether their variability could be explained by either biotic or abiotic factors. Our database compiled 112 studies spanning arctic to tropical biomes that reported the dual water isotope composition (delta H-2 and delta O-18) of plant (stem) and source water, including soil water (sampled following various methodologies and along a variable range of depths). We calculated plant source H-2 offsets in two ways: a line conditioned excess (LC-excess) that describes the H-2 deviation from the local meteoric water line and a soil water line conditioned excess (SW-excess) that describes the deviation from the soil water line, for each sampling campaign within each study. We tested for the effects of climate (air temperature and soil water content), soil class, and plant traits (growth form, leaf habit, wood density, and parenchyma fraction and mycorrhizal habit) on LC-excess and SW-excess. Globally, stem water was more depleted in H-2 than in soil water (SW-excess < 0) by 3.02 +/- 0.65 parts per thousand (P < 0.05 according to estimates of our linear mixed model and weighted by sample size within studies). In 95 % of the cases where SW-excess was negative, LC-excess was negative, indicating that the uptake of water that had not undergone evaporative enrichment (such as groundwater) was unlikely to explain the observed soil-plant water isotopic offsets. Soil class and plant traits did not have any significant effect on SW-excess. SW-excess was more negative in cold and wet sites, whereas it was more positive in warm sites. The climatic effects on SW-excess suggest that methodological artefacts are unlikely to be the sole cause of observed isotopic offsets. Our results would imply that plant source water isotopic offsets may lead to inaccuracies when using the isotopic composition of bulk stem water as a proxy to infer plant water sources.
dc.language.isoen
dc.publisherEuropean Geosciences Union
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subject.enIsotope stable
dc.subject.enTransport hydrique
dc.subject.en000837093700001
dc.title.enIsotopic offsets between bulk plant water and its sources are larger in cool and wet environments
dc.typeArticle de revue
dc.identifier.doi10.5194/hess-26-4125-2022
dc.subject.halSciences de l'environnement
bordeaux.journalHydrology and Earth System Sciences
bordeaux.page4125 - 4146
bordeaux.volume26
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue15
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03778871
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03778871v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Hydrology%20and%20Earth%20System%20Sciences&amp;rft.date=2022-08-08&amp;rft.volume=26&amp;rft.issue=15&amp;rft.spage=4125%20-%204146&amp;rft.epage=4125%20-%204146&amp;rft.eissn=1027-5606&amp;rft.issn=1027-5606&amp;rft.au=DE%20LA%20CASA,%20Javier&amp;BARBETA,%20Adri%C3%A0&amp;RODR%C3%8DGUEZ-U%C3%91A,%20Asun&amp;WINGATE,%20Lisa&amp;OG%C3%89E,%20J%C3%A9r%C3%B4me&amp;rft.genre=article


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