Divergent forest sensitivity to repeated extreme droughts

被引:221
作者
Anderegg, William R. L. [1 ]
Trugman, Anna T. [1 ,2 ]
Badgley, Grayson [1 ]
Konings, Alexandra G. [3 ]
Shaw, John [4 ]
机构
[1] Univ Utah, Sch Biol Sci, Salt Lake City, UT 84112 USA
[2] Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA
[3] Stanford Univ, Dept Earth Syst Sci, Stanford, CA 94305 USA
[4] US Forest Serv, Rocky Mt Res Stn, Ogden, UT USA
基金
美国食品与农业研究所;
关键词
GLOBAL ANALYSIS; VEGETATION; MODELS; PRODUCTIVITY; PROJECTIONS; RESILIENCE; REDUCTION; RESPONSES; EMBOLISM; DATASETS;
D O I
10.1038/s41558-020-00919-1
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Climate change-driven increases in drought frequency and severity could compromise forest ecosystems and the terrestrial carbon sink(1-3). While the impacts of single droughts on forests have been widely studied(4-6), understanding whether forests acclimate to or become more vulnerable to sequential droughts remains largely unknown and is crucial for predicting future forest health. We combine cross-biome datasets of tree growth, tree mortality and ecosystem water content to quantify the effects of multiple droughts at a range of scales from individual trees to the globe from 1900 to 2018. We find that subsequent droughts generally have a more deleterious impact than initial droughts, but this effect differs enormously by clade and ecosystem, with gymnosperms and conifer-dominated ecosystems more often exhibiting increased vulnerability to multiple droughts. The differential impacts of multiple droughts across clades and biomes indicate that drought frequency changes may have fundamentally different ecological and carbon-cycle consequences across ecosystems.
引用
收藏
页码:1091 / U19
页数:19
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