Despite experiencing a decadal shift towards drought conditions at the end of the 2Oth century,semiarid grasslands in northeast Asia(NEA)exhibited an evident greening trend from 1982 to 2020.However,the mechanism behi...Despite experiencing a decadal shift towards drought conditions at the end of the 2Oth century,semiarid grasslands in northeast Asia(NEA)exhibited an evident greening trend from 1982 to 2020.However,the mechanism behind this phenomenon remains unclear.Hence,we analysed the interdecadal changes in vegetation response to drought on the basis of the standardised precipitation evapotranspiration index(SPEI)and Global Inventory Modelling and Mapping Studies LAI4g datasets,with an emphasis on the differences between direct and legacy effects(as measured by resilience),to explore the mechanism of persistent grassland greening.Results revealed that during the post-drought shift period(2000-2020),the sudden decrease in the water content of the intermediate soil layer triggered an intensified vegetation response to drought.Specifically,although direct effects and resilience were amplified,they exhibited asymmetric changes.Resilience was stronger than direct effects,and this difference increased with increasing drought(drought recovery)levels.These combined effects may account for persistent greening against intensified drying in the semiarid grasslands in NEA.Given the projected exacerbation of future droughts,this study holds notable importance for comprehending the long-term change dynamics of dryland ecosystems.展开更多
1.Introduction Human-induced climate change,including more frequent and more intense of some type of extreme events,has caused widespread adverse impacts and related losses and damages to natural environment,ecosystem...1.Introduction Human-induced climate change,including more frequent and more intense of some type of extreme events,has caused widespread adverse impacts and related losses and damages to natural environment,ecosystems,and human society(IPCC,2022).In the recent decades,the economic losses caused by climate change and its accompanying extreme events have increased in China.It becomes necessary to understand the causes of anomalous climate and extremes.Under the backdrop of global warming,the year 2021 was very warm in China along with the occurrence of very unusual extreme events(CMA,2022).Documenting and explaining the climate each year,including the anomalous state and the most significant extreme weather and climate events,are important to improve scientific understanding of fast-evolving climate,and to provide the public and policymakers with timely,peer-reviewed,authoritative scientific information.展开更多
基金supported by the National Natural Science Foundation of China (42021004).
文摘Despite experiencing a decadal shift towards drought conditions at the end of the 2Oth century,semiarid grasslands in northeast Asia(NEA)exhibited an evident greening trend from 1982 to 2020.However,the mechanism behind this phenomenon remains unclear.Hence,we analysed the interdecadal changes in vegetation response to drought on the basis of the standardised precipitation evapotranspiration index(SPEI)and Global Inventory Modelling and Mapping Studies LAI4g datasets,with an emphasis on the differences between direct and legacy effects(as measured by resilience),to explore the mechanism of persistent grassland greening.Results revealed that during the post-drought shift period(2000-2020),the sudden decrease in the water content of the intermediate soil layer triggered an intensified vegetation response to drought.Specifically,although direct effects and resilience were amplified,they exhibited asymmetric changes.Resilience was stronger than direct effects,and this difference increased with increasing drought(drought recovery)levels.These combined effects may account for persistent greening against intensified drying in the semiarid grasslands in NEA.Given the projected exacerbation of future droughts,this study holds notable importance for comprehending the long-term change dynamics of dryland ecosystems.
文摘1.Introduction Human-induced climate change,including more frequent and more intense of some type of extreme events,has caused widespread adverse impacts and related losses and damages to natural environment,ecosystems,and human society(IPCC,2022).In the recent decades,the economic losses caused by climate change and its accompanying extreme events have increased in China.It becomes necessary to understand the causes of anomalous climate and extremes.Under the backdrop of global warming,the year 2021 was very warm in China along with the occurrence of very unusual extreme events(CMA,2022).Documenting and explaining the climate each year,including the anomalous state and the most significant extreme weather and climate events,are important to improve scientific understanding of fast-evolving climate,and to provide the public and policymakers with timely,peer-reviewed,authoritative scientific information.
