数字农科院2.0

Altitude weakens the drought resistance-resilience tradeoff across northern ecosystems

文献类型： 外文期刊

作者： Yuting Yang;Xie He;Yunfei Feng;Ben Niu;Jianshuang Wu;Meng Li

作者机构：

关键词： Climate change;Control factor;Remote sensing;Stability;Vegetation growth

期刊名称： Global and Planetary Change

ISSN： 0921-8181

年卷期： 2025 年 254 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Ecosystem stability during droughts determined by two key attributes: resistance and resilience, which often exhibit a tradeoff across species to biome scales. However, under extreme environmental stress, ecosystems may activate multidimensional stabilization mechanisms that weaken this tradeoff. In this study, we hypothesize that high-altitude ecosystems, shaped by greater climatic heterogeneity and harsher abiotic constraints, display a weaker resistance–resilience tradeoff compared to lowland systems. Focusing on northern terrestrial ecosystems (≥ 30° N), we integrate drought indices with eddy covariance data and remote sensing observations to map the spatial patterns of drought resistance, resilience, and their tradeoffs. Our analysis confirms that the resistance–resilience tradeoff is widespread, yet weakens with increasing altitude. Using explainable machine learning, we identify altitude as the dominant driver of spatial variability in tradeoff strength. Crucially, this effect is biome-dependent: in arid biomes (shrublands, savannas, and grasslands), altitude is a key predictor, whereas in humid biomes (forests and wetlands), climatic variables play a stronger role. Aridity-gradient analysis further reveals that altitude's explanatory power declines in wetter environments. For nearly all biomes, with the exception of wetlands, the resistance–resilience tradeoff weakens with increasing altitude. Finally, Earth System Models (ESMs) from the CMIP6 ensemble fail to capture this altitudinal variability, limiting their predictive accuracy. Our findings highlight the critical role of altitude-driven stability dynamics in shaping drought responses.

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