JING, Xin; BAUM, Christel; CASTAGNEYROL, Bastien; EISENHAUER, Nico; FERLIAN, Olga; GEBAUER, Tobias; HAJEK, Peter; JACTEL, Hervé; MUYS, Bart; NOCK, Charles; PONETTE, Quentin; ROSE, Laura; SAURER, Matthias; SCHERER‐LORENZEN, Michael; VERHEYEN, Kris; VAN MEERBEEK, Koenraad

doi:10.1111/nph.19931

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JING, Xin
Department of Earth and Environmental Sciences [Leuven-Heverlee]
Lanzhou University

BAUM, Christel
University of Rostock

CASTAGNEYROL, Bastien
Biodiversité, Gènes & Communautés [BioGeCo]

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New Phytologist. 2024-06-27p. 1-17

Wiley

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Summary Recent droughts have strongly impacted forest ecosystems and are projected to increase in frequency, intensity, and duration in the future together with continued warming. While evidence suggests that tree diversity can regulate drought impacts in natural forests, few studies examine whether mixed tree plantations are more resistant to the impacts of severe droughts. Using natural variations in leaf carbon (C) and nitrogen (N) isotopic ratios, that is δ 13 C and δ 15 N, as proxies for drought response, we analyzed the effects of tree species richness on the functional responses of tree plantations to the pan‐European 2018 summer drought in seven European tree diversity experiments. We found that leaf δ 13 C decreased with increasing tree species richness, indicating less drought stress. This effect was not related to drought intensity, nor desiccation tolerance of the tree species. Leaf δ 15 N increased with drought intensity, indicating a shift toward more open N cycling as water availability diminishes. Additionally, drought intensity was observed to alter the influence of tree species richness on leaf δ 15 N from weakly negative under low drought intensity to weakly positive under high drought intensity. Overall, our findings suggest that dual leaf isotope analysis helps understand the interaction between drought, nutrients, and species richness.< Réduire

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biodiversity

climate change

drought resistance

ecosystem functioning

species richness

stable isotope

TreeDivNet

tree plantations

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Leaf isotopes reveal tree diversity effects on the functional responses to the pan‐European 2018 summer drought

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