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Chilling and heat requirements for leaf unfolding in European beech and sessile oak populations at the southern limit of their distribution range

hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDANTEC, Cécile
hal.structure.identifierInstitute of Botany
dc.contributor.authorVITASSE, Yann
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorBONHOMME, Marc
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLOUVET, Jean-Marc
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorKREMER, Antoine
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2014
dc.identifier.issn0020-7128
dc.description.abstractEnWith global warming, an advance in spring leaf phenology has been reported worldwide. However, it is difficult to forecast phenology for a given species, due to a lack of knowledge about chilling requirements. We quantified chilling and heat requirements for leaf unfolding in two European tree species and investigated their relative contributions to phenological variations between and within populations. We used an extensive database containing information about the leaf phenology of 14 oak and 10 beech populations monitored over elevation gradients since 2005. In parallel, we studied the various bud dormancy phases, in controlled conditions, by regularly sampling low- and high-elevation populations during fall and winter. Oak was 2.3 times more sensitive to temperature for leaf unfolding over the elevation gradient and had a lower chilling requirement for dormancy release than beech. We found that chilling is currently insufficient for the full release of dormancy, for both species, at the lowest elevations in the area studied. Genetic variation in leaf unfolding timing between and within oak populations was probably due to differences in heat requirement rather than differences in chilling requirement. Our results demonstrate the importance of chilling for leaf unfolding in forest trees and indicate that the advance in leaf unfolding phenology with increasing temperature will probably be less pronounced than forecasted. This highlights the urgent need to determine experimentally the interactions between chilling and heat requirements in forest tree species, to improve our understanding and modeling of changes in phenological timing under global warming.
dc.language.isoen
dc.publisherSpringer Verlag
dc.subject.enclimate change
dc.subject.encuttings
dc.subject.enphenology
dc.subject.enheat/chilling requirement
dc.subject.ensessile oak
dc.subject.eneuropean beech
dc.title.enChilling and heat requirements for leaf unfolding in European beech and sessile oak populations at the southern limit of their distribution range
dc.typeArticle de revue
dc.subject.halSciences du Vivant [q-bio]
bordeaux.journalInternational Journal of Biometeorology
bordeaux.page1853-1864
bordeaux.volume58
bordeaux.issue9
bordeaux.peerReviewedoui
hal.identifierhal-01189851
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01189851v1
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