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The role of biotic interactions in altering tree seedling responses to an extreme climatic event

hal.structure.identifierEcosystèmes montagnards [UR EMGR]
dc.contributor.authorSACCONE, Patrick
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierEcosystèmes montagnards [UR EMGR]
dc.contributor.authorPAGÈS, Jean-Philippe
hal.structure.identifierEcosystèmes montagnards [UR EMGR]
dc.contributor.authorBRUN, Jean-Jacques
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorMICHALET, Richard
dc.date.issued2009
dc.identifier.issn1100-9233
dc.description.abstractEnQuestions: We addressed two poorly understood aspects of plant response to climate change: the impact of extreme climatic events and the mediating role of biotic interactions, through a study of heatwave effects on tree seedling survival rates and ability of the tree canopy to alter seedling responses. Location: Mountain belt of the northern French Alps (Maurienne Valley). Methods: The survival rates of two seedling cohorts from four tree species (Abies alba, Acer pseudoplatanus, Fraxinus excelsior and Picea abies) were measured during both the 2003 European heatwave and an average summer (2004) in deciduous broadleaf mountain forests. Seedlings were transplanted into two soil moisture conditions, and in experimental gaps or under the tree canopy. Results: The heatwave strongly decreased tree seedling survival rates, while there was an important species-specific mediating role of biotic interactions. In the wettest conditions, the tree canopy strongly increased survival of Abies, buffering the negative impact of the heatwave. In contrast, in the driest conditions, the tree canopy decreased survival of Picea and Acer, amplifying the negative impact of the heatwave. We found evidence of increasing soil water stress in the understorey of the driest community, but further studies including vapour pressure deficit measurements are needed to elucidate the driving mechanism of facilitation. Conclusions: The high species specificity of the mediating role of biotic interactions and its variation along stress gradients leads to questions on our ability to predict large-scale responses of species to climate changes.
dc.language.isoen
dc.publisherWiley
dc.subjectFACILITATION
dc.subjectERABLE FAUX PLATANE
dc.subjectEPICEA COMMUN
dc.subjectVAGUE DE CHALEUR
dc.subjectINTERACTION BIOTIQUE
dc.subject.enCLIMATIC CHANGES
dc.subject.enCOMPETITION
dc.subject.enHEATWAVE
dc.subject.enSURVIVAL
dc.subject.enSAPIN ARGENTE
dc.title.enThe role of biotic interactions in altering tree seedling responses to an extreme climatic event
dc.typeArticle de revue
dc.identifier.doi10.1111/j.1654-1103.2009.01012.x
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalJournal of Vegetation Science
bordeaux.page403 - 414
bordeaux.volume20
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-02663897
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02663897v1
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