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Elevated CO2 did not affect the hydrological balance of a mature native Eucalyptus woodland

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorGIMENO, Teresa E.
hal.structure.identifierCommonwealth Scientific and Industrial Research Organisation [Canberra] [CSIRO]
hal.structure.identifierAustralian Research Council [ARC]
dc.contributor.authorMCVICAR, Tim R.
hal.structure.identifierCommonwealth Scientific and Industrial Research Organisation [Canberra] [CSIRO]
dc.contributor.authorO'GRADY, Anthony P.
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorTISSUE, David T.
hal.structure.identifierHawkesbury Institute for the Environment
dc.contributor.authorELLSWORTH, David S.
dc.date.accessioned2024-04-08T12:06:13Z
dc.date.available2024-04-08T12:06:13Z
dc.date.issued2018
dc.identifier.issn1354-1013
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196391
dc.description.abstractEnElevated atmospheric CO2 concentration (eC(a)) might reduce forest water-use, due to decreased transpiration, following partial stomatal closure, thus enhancing water-use efficiency and productivity at low water availability. If evapotranspiration (E-t) is reduced, it may subsequently increase soil water storage (S) or surface runoff (R) and drainage (D-g), although these could be offset or even reversed by changes in vegetation structure, mainly increased leaf area index (L). To understand the effect of eC(a) in a water-limited ecosystem, we tested whether 2years of eC(a) (40% increase) affected the hydrological partitioning in a mature water-limited Eucalyptus woodland exposed to Free-Air CO2 Enrichment (FACE). This timeframe allowed us to evaluate whether physiological effects of eC(a) reduced stand water-use irrespective of L, which was unaffected by eC(a) in this timeframe. We hypothesized that eC(a) would reduce tree-canopy transpiration (E-tree), but excess water from reduced E-tree would be lost via increased soil evaporation and understory transpiration (E-floor) with no increase in S, R or D-g. We computed E-t, S, R and D-g from measurements of sapflow velocity, L, soil water content (), understory micrometeorology, throughfall and stemflow. We found that eC(a) did not affect E-tree, E-floor, S or at any depth (to 4.5m) over the experimental period. We closed the water balance for dry seasons with no differences in the partitioning to R and D-g between C-a levels. Soil temperature and were the main drivers of E-floor while vapour pressure deficit-controlled E-tree, though eC(a) did not significantly affect any of these relationships. Our results suggest that in the short-term, eC(a) does not significantly affect ecosystem water-use at this site. We conclude that water-savings under eC(a) mediated by either direct effects on plant transpiration or by indirect effects via changes in L or soil moisture availability are unlikely in water-limited mature eucalypt woodlands.
dc.language.isoen
dc.publisherWiley
dc.subjectinterception
dc.subjectstomatal conductance
dc.subject.enEucalyptus tereticornis
dc.subject.enclimate change
dc.subject.enfree-air CO2 enrichment
dc.subject.entree water
dc.subject.enwater-use efficiency
dc.title.enElevated CO2 did not affect the hydrological balance of a mature native Eucalyptus woodland
dc.typeArticle de revue
dc.identifier.doi10.1111/gcb.14139
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
dc.description.sponsorshipEuropeUnveiling Stomata 24/7: Using Stable Isotopes and COS to quantify diurnal and nocturnal carbon and water vegetation-atmosphere Fluxes under future climate scenarios
bordeaux.journalGlobal Change Biology
bordeaux.page3010-3024
bordeaux.volume24
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue7
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02620882
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02620882v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Global%20Change%20Biology&rft.date=2018&rft.volume=24&rft.issue=7&rft.spage=3010-3024&rft.epage=3010-3024&rft.eissn=1354-1013&rft.issn=1354-1013&rft.au=GIMENO,%20Teresa%20E.&MCVICAR,%20Tim%20R.&O'GRADY,%20Anthony%20P.&TISSUE,%20David%20T.&ELLSWORTH,%20David%20S.&rft.genre=article


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