期刊
ECOLOGY LETTERS
卷 20, 期 4, 页码 539-553出版社
WILEY
DOI: 10.1111/ele.12748
关键词
Climate change; die-off; forest dynamics; functional traits
类别
资金
- Leverhulme Trust via International Network [IN-2013-004]
- European Union [PCOFUND-GA-2010-267243]
- University of Stirling
- TRY initiative on plant traits
- Max Planck Institute for Biogeochemistry, Jena, Germany
- DIVERSITAS, IGBP
- Global Land Project
- UK Natural Environment Research Council (NERC) through its program QUEST (Quantifying and Understanding the Earth System)
- French Foundation for Biodiversity Research (FRB)
- GIS 'Climat, Environnement et Societe' France
- U.S. Geological Survey's Ecosystems and Climate & Land Use Change mission areas (through the Western Mountain Initiative)
Drought events are increasing globally, and reports of consequent forest mortality are widespread. However, due to a lack of a quantitative global synthesis, it is still not clear whether drought-induced mortality rates differ among global biomes and whether functional traits influence the risk of drought-induced mortality. To address these uncertainties, we performed a global meta-analysis of 58 studies of drought-induced forest mortality. Mortality rates were modelled as a function of drought, temperature, biomes, phylogenetic and functional groups and functional traits. We identified a consistent global-scale response, where mortality increased with drought severity [ log mortality (trees trees(-1) year(-1)) increased 0.46 (95% CI = 0.2-0.7) with one SPEI unit drought intensity]. We found no significant differences in the magnitude of the response depending on forest biomes or between angiosperms and gymnosperms or evergreen and deciduous tree species. Functional traits explained some of the variation in drought responses between species (i.e. increased from 30 to 37% when wood density and specific leaf area were included). Tree species with denser wood and lower specific leaf area showed lower mortality responses. Our results illustrate the value of functional traits for understanding patterns of drought-induced tree mortality and suggest that mortality could become increasingly widespread in the future.
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