Tree drought-mortality risk depends more on intrinsic species resistance than on stand species diversity

Decarsin Renaud, Guillemot Joannès, Le Maire Guerric, Blondeel Haben, Meredieu Céline, Achard Emma, Bonal Damien, Cochard Hervé, Corso Déborah, Delzon Sylvain, Doucet Zoé, Druel Arsène, Grossiord Charlotte, Torres-Ruiz José Manuel, Bauhus Jürgen, Godbold Douglas L., Hajek Peter, Jactel Hervé, Jensen Joel, Mereu Simone, Ponette Quentin, Rewald Boris, Ruffault Julien, Sandén Hans, Scherer-Lorenzen Michael, Serrano-León Hernán, Simioni Guillaume, Verheyen Kris, Werner Ramona, Martin-StPaul Nicolas K.. 2024. Tree drought-mortality risk depends more on intrinsic species resistance than on stand species diversity. Global Change Biology, 30 (9):e17503, 15 p.

Url - jeu de données - Entrepôt autre : https://doi.org/10.57745/F4QITZ

Résumé : Increasing tree diversity is considered a key management option to adapt forests to climate change. However, the effect of species diversity on a forest's ability to cope with extreme drought remains elusive. In this study, we assessed drought tolerance (xylem vulnerability to cavitation) and water stress (water potential), and combined them into a metric of drought–mortality risk (hydraulic safety margin) during extreme 2021 or 2022 summer droughts in five European tree diversity experiments encompassing different biomes. Overall, we found that drought–mortality risk was primarily driven by species identity (56.7% of the total variability), while tree diversity had a much lower effect (8% of the total variability). This result remained valid at the local scale (i.e within experiment) and across the studied European biomes. Tree diversity effect on drought–mortality risk was mediated by changes in water stress intensity, not by changes in xylem vulnerability to cavitation. Significant diversity effects were observed in all experiments, but those effects often varied from positive to negative across mixtures for a given species. Indeed, we found that the composition of the mixtures (i.e., the identities of the species mixed), but not the species richness of the mixture per se, is a driver of tree drought–mortality risk. This calls for a better understanding of the underlying mechanisms before tree diversity can be considered an operational adaption tool to extreme drought. Forest diversification should be considered jointly with management strategies focussed on favouring drought-tolerant species.

Mots-clés Agrovoc : résistance à la sécheresse, adaptation aux changements climatiques, changement climatique, stress dû à la sécheresse, biodiversité, aménagement forestier, Quercus, arbre forestier, sécheresse, tolérance à la sécheresse, forêt, régénération naturelle, potentiel xylème eau, cavitation, Pinus pinaster

Mots-clés libres : Forest adaptation, Forest management, Hydraulic traits, Species interactions, Species richness, Tree diversity, Water stress, Xylem embolism

Agences de financement européennes : European Commission

Agences de financement hors UE : BiodivERsA COFUND, Agence Nationale de la Recherche, Agence de l'Environnement et de la Maîtrise de l'Energie, Centre de Coopération Internationale en Recherche Agronomique pour le Développement

Programme de financement européen : H2020

Projets sur financement : (FRA) Mixed Forest plantations for climate Change mitigation and adaptation., (EU) Improving access to FORest GENetic resources Information and services for end-USers

Auteurs et affiliations

• Decarsin Renaud, CIRAD-PERSYST-UMR Eco&Sols (FRA) - auteur correspondant
• Guillemot Joannès, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0003-4385-7656
• Le Maire Guerric, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-5227-958X
• Blondeel Haben, Ghent University (BEL)
• Meredieu Céline, INRAE (FRA)
• Achard Emma, INRAE (FRA)
• Bonal Damien, INRAE (FRA)
• Cochard Hervé, INRAE (FRA)
• Corso Déborah, Université de Bordeaux (FRA)
• Delzon Sylvain, INRAE (FRA)
• Doucet Zoé, Universitaet Freiburg (DEU)
• Druel Arsène, INRAE (FRA)
• Grossiord Charlotte, EPFL (CHE)
• Torres-Ruiz José Manuel, IRNAS (ESP)
• Bauhus Jürgen, Universität Freiburg (DEU)
• Godbold Douglas L., Mendel University in Brno (CZE)
• Hajek Peter, Universität Freiburg (DEU)
• Jactel Hervé, INRAE (FRA)
• Jensen Joel, Swedish University of Agricultural Sciences (SWE)
• Mereu Simone, CNR-IBE (ITA)
• Ponette Quentin, UCL (BEL)
• Rewald Boris, Mendel University (CZE)
• Ruffault Julien, INRAE (FRA)
• Sandén Hans, BOKU (AUT)
• Scherer-Lorenzen Michael, Universität Freiburg (DEU)
• Serrano-León Hernán, Universität Freiburg (DEU)
• Simioni Guillaume, INRAE (FRA)
• Verheyen Kris, Ghent University (BEL)
• Werner Ramona, BOKU (AUT)
• Martin-StPaul Nicolas K., INRAE (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610448/)

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