Enhanced growth resistance but no decline in growth resilience under long‐term extreme droughts

作者：Xiaona Wang, Taoran Xu, Chenxi Xu, Hongyan Liu, Zhenju Chen, Zongshan Li, Ximeng Li, Xiuchen Wu · 发表于：Global Change Biology · 年份：2023 · DOI：10.1111/gcb.17038 · 被引用次数：53 · 研究领域：Plant Water Relations and Carbon Dynamics、Hydrology and Drought Analysis、Climate change impacts on agriculture

The frequency, intensity, and duration of extreme droughts, with devastating impacts on tree growth and survival, have increased with climate change over the past decades. Assessing growth resistance and resilience to drought is a crucial prerequisite for understanding the responses of forest functioning to drought events. However, the responses of growth resistance and resilience to extreme droughts with different durations across different climatic zones remain unclear. Here, we investigated the spatiotemporal patterns in growth resistance and resilience in response to extreme droughts with different durations during 1901-2015, relying on tree-ring chronologies from 2389 forest stands over the mid- and high-latitudinal Northern Hemisphere, species-specific plant functional traits, and diverse climatic factors. The findings revealed that growth resistance and resilience under 1-year droughts were higher in humid regions than in arid regions. Significant higher growth resistance was observed under 2-year droughts than under 1-year droughts in both arid and humid regions, while growth resilience did not show a significant difference. Temporally, tree growth became less resistant and resilient to 1-year droughts in 1980-2015 than in 1901-1979 in both arid and humid regions. As drought duration lengthened, the predominant impacts of climatic factors on growth resistance and resilience weakened and instead foliar economic traits, plant hydraulic traits, and soil properties became...