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

Bibliographische Detailangaben
Veröffentlicht in:	Global change biology. - 1999. - 30(2024), 9 vom: 15. Sept., Seite e17503
1. Verfasser:	Decarsin, Renaud (VerfasserIn)
Weitere Verfasser:	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
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2024
Zugriff auf das übergeordnete Werk:	Global change biology
Schlagworte:	Journal Article forest adaptation forest management hydraulic traits species interactions species richness tree diversity water stress xylem embolism

Beschreibung
Zusammenfassung:	© 2024 John Wiley & Sons Ltd. 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
Beschreibung:	Date Completed 24.09.2024 Date Revised 24.09.2024 published: Print Citation Status MEDLINE
ISSN:	1365-2486
DOI:	10.1111/gcb.17503