生态学报2025，Vol.45Issue(24)：12288-12305,18.DOI:10.20103/j.stxb.202503160590
近40年中国植被对复合干热事件的抵抗和恢复响应及其驱动因素
The resistance and recovery responses of vegetation to compound drought-heat events in China and their driving factors analysis over the past 40 years
摘要
Abstract
Under global warming,the frequency and intensity of extreme climate events are exhibiting a pronounced upward trend,imposing severe challenges to ecosystems and socio-economic development.Notably,compound dry and hot events(CDHEs)—characterized by the synergistic effects of drought and extreme heat—have emerged as a critical threat to vegetation ecological functioning,surpassing the impacts of individual extremes.However,the response processes of vegetation to CDHEs,particularly the spatial patterns and underlying drivers of its resistance and recovery,remains elusive in current studies.Based on ERA5-Land climate reanalysis data,Normalized Difference Vegetation Index(NDVI)data,and vegetation type data in China from 1982 to 2022,this study developed a Standardized Compound Dry and Hot Index(SCDHI).The SCDHI was constructed through the integration of the Standardized Precipitation Evapotranspiration Index(SPEI)and the Standardized Temperature Index(STI)employing the Frank Copula function.The SCDHI subsequently elucidated the spatiotemporal distribution characteristics of CDHEs,including intensity and severity,and investigated the responses of different vegetation types to these events,with particular focus on their resistance and recovery.Finally,through quantitative assessment of driving factor contributions,the study further clarified the relative importance of different environmental controls on vegetation resistance and recovery to CDHEs.The results revealed regional heterogeneity in the spatiotemporal distribution of CDHEs.North China,Central China,and Southwest China emerge as hotspots for high-intensity,prolonged CDHEs,primarily attributable to precipitation variability,elevated temperatures,and reduced atmospheric humidity.In contrast,the Yangtze River Basin,influenced by monsoon dynamics,experienced higher severity of CDHEs.From a temporal perspective,the overall changes in vegetation resistance and recovery are not significant,but ecological resilience has declined in some regions.Substantial variability in vegetation resilience to CDHEs was observed across different ecosystem types.Alpine vegetation,marshes,forest vegetation,and meadows exhibited higher resistance(median values above 1.7),while cultivated vegetation,grassland(excluding meadows),and shrublands displayed relatively lower resistance.Conversely,shrublands,croplands,and grasslands demonstrated enhanced recovery potential,in contrast to forests,alpine ecosystems,and wetlands which showed more limited recovery capabilities.The contribution rates of driving factors for CDHEs exhibited distinct temporal and spatial patterns.During the resistance phase,precipitation and saturated vapor pressure were the dominant factors,particularly in North China,Central China,and Southwest China.During the recovery phase,precipitation played a major role in vegetation recovery,especially in North China and Northeast China.These findings provide scientific evidence for developing regional ecological management and adaptive regulation.关键词
复合干热事件/植被抵抗性和恢复性/NDVI/驱动力/中国Key words
compound dry and hot events/vegetation resistance and recovery/NDVI/driving forces/China引用本文复制引用
LI Hao,TAN Zhenping,GUI Xinyuan,WU Guangming,JIANG Liangliang..近40年中国植被对复合干热事件的抵抗和恢复响应及其驱动因素[J].生态学报,2025,45(24):12288-12305,18.基金项目
国家自然科学基金(42201124) （42201124）
中国博士后科学基金(2023M740433) （2023M740433）
重庆市自然科学基金创新发展联合基金项目(CSTB2025NSCQ-LZX0118) （CSTB2025NSCQ-LZX0118）
重庆创业创新支持计划项目(2204012976986965) （2204012976986965）
