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The O-18 ecohydrology of a grassland ecosystem - predictions and observations

hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierLehrstuhl für Grünlandlehre
dc.contributor.authorHIRL, Regina T.
hal.structure.identifierLehrstuhl für Grünlandlehre
dc.contributor.authorSCHNYDER, Hans
hal.structure.identifierLehrstuhl für Grünlandlehre
dc.contributor.authorOSTLER, Ulrike
hal.structure.identifierLehrstuhl für Grünlandlehre
dc.contributor.authorSCHÄUFELE, Rudi
hal.structure.identifierLehrstuhl für Grünlandlehre
hal.structure.identifierEberswalde University for Sustainable Development [HNE]
dc.contributor.authorSCHLEIP, Inga
hal.structure.identifierInstitute of Biological and Environmental Sciences
dc.contributor.authorVETTER, Sylvia H.
hal.structure.identifierLehrstuhl für Grünlandlehre
dc.contributor.authorAUERSWALD, Karl
hal.structure.identifierLehrstuhl für Grünlandlehre
dc.contributor.authorBACA CABRERA, Juan C.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorWINGATE, Lisa
hal.structure.identifierSydney Institute of Agriculture
dc.contributor.authorBARBOUR, Margaret M.
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorOGÉE, Jérôme
dc.date.accessioned2024-04-08T12:04:08Z
dc.date.available2024-04-08T12:04:08Z
dc.date.issued2019
dc.identifier.issn1027-5606
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196294
dc.description.abstractEnThe oxygen isotope composition (δ18O) of leaf water (δ18Oleaf) is an important determinant of environmental and physiological information found in biological archives, but the system-scale understanding of the propagation of the δ18O of rain through soil and xylem water to δ18Oleaf has not been verified for grassland. Here we report a unique and comprehensive dataset of fortnightly δ18O observations in soil, stem and leaf waters made over seven growing seasons in a temperate, drought-prone, mixed-species grassland. Using the ecohydrology part of a physically based, 18O-enabled soil–plant–atmosphere transfer model (MuSICA), we evaluated our ability to predict the dynamics of δ18O in soil water, the depth of water uptake, and the effects of soil and atmospheric moisture on 18O enrichment of leaf water (Δ18Oleaf) in this ecosystem. The model accurately predicted the δ18O dynamics of the different ecosystem water pools, suggesting that the model generated realistic predictions of the vertical distribution of soil water and root water uptake dynamics. Observations and model predictions indicated that water uptake occurred predominantly from shallow (<20 cm) soil depths throughout dry and wet periods in all years, presumably due (at least in part) to the effects of high grazing pressure on root system turnover and placement. Δ18Oleaf responded to both soil and atmospheric moisture contents and was best described in terms of constant proportions of unenriched and evaporatively enriched water (two-pool model). The good agreement between model predictions and observations is remarkable as model parameters describing the relevant physical features or functional relationships of soil and vegetation were held constant with one single value for the entire mixed-species ecosystem.
dc.language.isoen
dc.publisherEuropean Geosciences Union
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enThe O-18 ecohydrology of a grassland ecosystem - predictions and observations
dc.typeArticle de revue
dc.identifier.doi10.5194/hess-23-2581-2019
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalHydrology and Earth System Sciences
bordeaux.page2581-2600
bordeaux.volume23
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue6
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02627763
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02627763v1
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=2019&amp;rft.volume=23&amp;rft.issue=6&amp;rft.spage=2581-2600&amp;rft.epage=2581-2600&amp;rft.eissn=1027-5606&amp;rft.issn=1027-5606&amp;rft.au=HIRL,%20Regina%20T.&amp;SCHNYDER,%20Hans&amp;OSTLER,%20Ulrike&amp;SCH%C3%84UFELE,%20Rudi&amp;SCHLEIP,%20Inga&amp;rft.genre=article


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