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Balancing the risk of hydraulic failure and carbon starvation: a twig scale analysis in declining Scots pine

hal.structure.identifierSchool of GeoSciences
dc.contributor.authorSALMON, Yann
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorTORRES RUIZ, Jose Manuel
hal.structure.identifierCentre for Ecological Research and Forestry Applications [CREAF]
dc.contributor.authorPOYATOS, Rafael
hal.structure.identifierCentre for Ecological Research and Forestry Applications [CREAF]
dc.contributor.authorMARTINEZ-VILALTA, Jordi
hal.structure.identifierUniversity of Edinburgh [Edin.]
hal.structure.identifierResearch School of Biology
dc.contributor.authorMEIR, Patrick
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierSchool of GeoSciences
hal.structure.identifierInstitució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies [ICREA]
dc.contributor.authorMENCUCCINI, Maurizio
dc.date.issued2015
dc.date.conference2015-09-07
dc.description.abstractEnUnderstanding physiological processes involved in drought-induced mortality is important for predicting the future of forests and for modelling the carbon and water cycles. Recent research has highlighted the variable risks of carbon starvation and hydraulic failure in drought-exposed trees. However, little is known about the specific responses of leaves and supporting twigs, despite their critical role in balancing carbon acquisition and water loss. Comparing healthy (non-defoliated) and unhealthy (defoliated) Scots pine at the same site, we measured physiological variables involved in regulating carbon and water resources. Defoliated trees showed different responses to summer drought compared to non-defoliated trees. Defoliated trees maintained gas-exchange while non-defoliated trees reduced photosynthesis and transpiration during the drought period. At the branch scale, very few differences were observed in non-structural carbohydrate concentrations between health classes. However, defoliated trees tended to have lower water potentials and smaller hydraulic safety margins. While nondefoliated trees showed a typical response to drought for an isohydric species, the physiology appears to be driven in defoliated trees by the need to maintain carbon resources in twigs. These responses put defoliated trees at higher risk of branch hydraulic failure and help to explain the interaction between carbon-starvation and hydraulic failure in dying trees.
dc.language.isoen
dc.publisherINRA - Université de Bordeaux
dc.publisher.locationBordeaux (france)
dc.subjectpanne hydraulique
dc.subject.enprivation de carbon
dc.subject.enPin sylvestre
dc.title.enBalancing the risk of hydraulic failure and carbon starvation: a twig scale analysis in declining Scots pine
dc.typeCommunication dans un congrès
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.page86 p.
bordeaux.conference.titleXylem International Meeting
bordeaux.countryFR
bordeaux.conference.cityBordeaux
bordeaux.peerReviewedoui
hal.identifierhal-02742313
hal.version1
hal.invitednon
hal.conference.end2015-09-09
hal.popularnon
hal.audienceNationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02742313v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2015&rft.spage=86%20p.&rft.epage=86%20p.&rft.au=SALMON,%20Yann&TORRES%20RUIZ,%20Jose%20Manuel&POYATOS,%20Rafael&MARTINEZ-VILALTA,%20Jordi&MEIR,%20Patrick&rft.genre=unknown


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