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Responses of plant leaf economic and hydraulic traits mediate the effects of early- and late-season drought on grassland productivity

hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorVITRA, Amarante
hal.structure.identifierAgroscope
hal.structure.identifierUniversité Grenoble Alpes [2016-2019] [UGA [2016-2019]]
dc.contributor.authorDELEGLISE, Claire
hal.structure.identifierAgroscope
dc.contributor.authorMEISSER, Marco
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorRISCH, Anita C.
hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorSIGNARBIEUX, Constant
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorLAMACQUE, Lia
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
hal.structure.identifierLaboratoire Chrono-environnement (UMR 6249) [LCE]
dc.contributor.authorBUTTLER, Alexandre
hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorMARIOTTE, Pierre
dc.date.issued2019
dc.identifier.issn2041-2851
dc.description.abstractEnDrought can occur at different times during the grassland growing season, likely having contrasting effects on forage production when happening early or later in the season. However, knowledge about the interacting effects of the timing of drought and the development stage of the vegetation during the growing season is still scarce, thus limiting our ability to accurately predict forage quantity losses. To investigate plant community responses to drought seasonality (early-vs. late-season), we established a drought experiment in two permanent grasslands of the Swiss Jura Mountains that are used for forage production. We measured three plant functional traits, including two leaf traits related to plant economics (specific leaf area, SLA; leaf dry matter content, LDMC) and one hydraulic trait related to physiological function (predicted percentage loss of hydraulic conductance, PLCp), of the most abundant species, and plant above-ground biomass production. Plant species composition was also determined to calculate community-weighted mean (CWM) traits. First, we observed that CWM trait values strongly varied during the growing season. Second, we found that late-season drought had stronger effects on CWM trait values than early-season drought and that the plant hydraulic trait was the most variable functional trait. Using a structural equation model, we also showed that reduction in soil moisture had no direct impacts on above-ground biomass production. Instead, we observed that the drought-induced decrease in above-ground biomass production was mediated by a higher CWM PLCp (i.e. higher risk of hydraulic failure) and lower CWM SLA under drought. Change in CWM SLA in response to drought was the best predictor of community above-ground biomass production. Our findings reveal the importance of drought timing together with the plant trait responses to assess drought impacts on grassland biomass production and suggest that incorporating these factors into mechanistic models could considerably improve predictions of climate change impacts.
dc.language.isoen
dc.publisherOxford University Press
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.subjectclimat extrème
dc.subjectdiversité
dc.subjectécosystème
dc.subjectbiomasse aérienne
dc.subjectplante
dc.subjectprairie
dc.subjectproductivité
dc.subjectvulnérabilité
dc.subjectstress hydrique
dc.subjectdynamique végétale
dc.subjectprécipitation
dc.subjectactivité hydraulique
dc.subjectsécheresse
dc.subjectpluviométrie
dc.subjectpopulation
dc.subject.enplant
dc.subject.enrainfall rate recording
dc.subject.engrassland
dc.subject.enwater stress
dc.subject.enhydraulic status
dc.subject.enprecipitation manipulation
dc.subject.enrainout shelter
dc.subject.enPlant Sciences
dc.subject.enEnvironmental Sciences & Ecology
dc.subject.encommunities
dc.subject.enDrought timing
dc.subject.engrassland productivity
dc.subject.enplant functional traits
dc.subject.envegetation dynamics
dc.subject.enwater limitation
dc.subject.enaboveground biomass production
dc.subject.enclimate extremes
dc.subject.enwater-stress
dc.subject.ensummer
dc.subject.endrought
dc.subject.enecosystem
dc.subject.enarea
dc.subject.envulnerability
dc.subject.endiversity
dc.subject.enrainfall
dc.title.enResponses of plant leaf economic and hydraulic traits mediate the effects of early- and late-season drought on grassland productivity
dc.typeArticle de revue
dc.identifier.doi10.1093/aobpla/plz023
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalAoB Plants
bordeaux.page15
bordeaux.volume11
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-02296164
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02296164v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=AoB%20Plants&rft.date=2019&rft.volume=11&rft.issue=3&rft.spage=15&rft.epage=15&rft.eissn=2041-2851&rft.issn=2041-2851&rft.au=VITRA,%20Amarante&DELEGLISE,%20Claire&MEISSER,%20Marco&RISCH,%20Anita%20C.&SIGNARBIEUX,%20Constant&rft.genre=article


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