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Large hydraulic safety margins protect Neotropical canopy rainforest tree species against hydraulic failure during drought

hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
hal.structure.identifierSILVA [SILVA]
dc.contributor.authorZIEGLER, Camille
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorCOSTE, Sabrina
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorSTAHL, Clement
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorLEVIONNOIS, Sébastien
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorCAZAL, Jocelyn
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierUniversity of Leeds
hal.structure.identifierUniversity of Birmingham [Birmingham]
dc.contributor.authorESQUIVEL-MUELBERT, Adriane
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorGORÊT, Jean-Yves
hal.structure.identifierBotanique et Modélisation de l'Architecture des Plantes et des Végétations [UMR AMAP]
dc.contributor.authorHEURET, Patrick
hal.structure.identifierEcologie des forêts de Guyane [UMR ECOFOG]
dc.contributor.authorJAOUEN, Gaëlle
hal.structure.identifierUniversity of California [UC]
hal.structure.identifierSmithsonian Tropical Research Institute
dc.contributor.authorSANTIAGO, Louis
hal.structure.identifierSILVA [SILVA]
dc.contributor.authorBONAL, Damien
dc.date.issued2019-12
dc.identifier.issn1286-4560
dc.description.abstractEnAbundant Neotropical canopy-tree species are more resistant to drought-induced branch embolism than what is currently admitted. Large hydraulic safety margins protect them from hydraulic failure under actual drought conditions.ContextXylem vulnerability to embolism, which is associated to survival under extreme drought conditions, is being increasingly studied in the tropics, but data on the risk of hydraulic failure for lowland Neotropical rainforest canopy-tree species, thought to be highly vulnerable, are lacking.AimsThe purpose of this study was to gain more knowledge on species drought-resistance characteristics in branches and leaves and the risk of hydraulic failure of abundant rainforest canopy-tree species during the dry season.MethodsWe first assessed the range of branch xylem vulnerability to embolism using the flow-centrifuge technique on 1-m-long sun-exposed branches and evaluated hydraulic safety margins with leaf turgor loss point and midday water potential during normal- and severe-intensity dry seasons for a large set of Amazonian rainforest canopy-tree species.ResultsTree species exhibited a broad range of embolism resistance, with the pressure threshold inducing 50% loss of branch hydraulic conductivity varying from − 1.86 to − 7.63 MPa. Conversely, we found low variability in leaf turgor loss point and dry season midday leaf water potential, and mostly large, positive hydraulic safety margins.ConclusionsRainforest canopy-tree species growing under elevated mean annual precipitation can have high resistance to embolism and are more resistant than what was previously thought. Thanks to early leaf turgor loss and high embolism resistance, most species have a low risk of hydraulic failure and are well able to withstand normal and even severe dry seasons.
dc.description.sponsorshipCEnter of the study of Biodiversity in Amazonia - ANR-10-LABX-0025
dc.description.sponsorshipANAEE-Services - ANR-11-INBS-0001
dc.description.sponsorshipRecherches Avancées sur l'Arbre et les Ecosytèmes Forestiers
dc.language.isoen
dc.publisherSpringer Nature (since 2011)/EDP Science (until 2010)
dc.subject.enWater potential
dc.subject.enTurgor loss point
dc.subject.enHydraulic safety margins
dc.subject.enAmazon rainforest
dc.subject.enEmbolism resistance
dc.title.enLarge hydraulic safety margins protect Neotropical canopy rainforest tree species against hydraulic failure during drought
dc.typeArticle de revue
dc.identifier.doi10.1007/s13595-019-0905-0
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale/Botanique
dc.subject.halSciences du Vivant [q-bio]/Ecologie, Environnement/Ecosystèmes
bordeaux.journalAnnals of Forest Science
bordeaux.page115
bordeaux.volume76
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-02432407
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02432407v1
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