草原
生态系统
草地生态系统
降水
生产力
内蒙古
生态学
全球变化
环境科学
气候变化
中国
气候学
地理
生物
地质学
气象学
经济
考古
宏观经济学
作者
Jiamei Sun,Wei Liu,Qingmin Pan,Bin Zhang,Yaxiang Lv,Jianhui Huang,Xingguo Han
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2022-11-23
卷期号:8 (47)
被引量:20
标识
DOI:10.1126/sciadv.add6249
摘要
Global change-induced extreme droughts are increasing in grasslands worldwide, and drought legacies may greatly affect the responses of grassland ecosystems to these changes. However, it remains poorly understood whether and how severe droughts have a positive legacy effect on grassland productivity. By combining a 4-year precipitation manipulation experiment with a 40-year observational study in a semiarid grassland, we showed that extreme droughts could create strong positive legacies on community productivity and that such legacies could last for multiple years. The mechanism behind this was the coupled effect of the drought-induced increase in annuals and the favorable precipitation pattern that facilitated the flourishing of annuals in subsequent years. This study provides experimental and observational evidence for positive drought legacies and reveals their underlying mechanisms. Our findings suggest that positive drought legacies should be incorporated into Earth system models to better predict the impact of extreme droughts on grassland ecosystems.
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