中国草地学报2025，Vol.47Issue(2)：8-20,13.DOI:10.16742/j.zgcdxb.20240329
半干旱草原内陆河流域复合干热气候特征及其植被响应
Characteristics of Compound Dry-Heat Events and the Vegetation Responses in an Inland River Basin of a Semi-arid Steppe
摘要
Abstract
With the rapid climate change,the occurrence of compound dry-heat events has increased,leading to significant impacts on plant growth and ecosystem.Therefore,assessing the severity of com-pound dry-heat events and its impacts on vegetation growth are crucial for understanding the hazards of extreme climate and for developing effective mitigation and adaptation strategies.In this study,the Copula function was used to propose the standardized compound dry-heat events index(SCDHI)based on the cumulative joint probability of the standardized precipitation index(SPI)and the standardized temperature index(STI).Evolution of the compound dry-heat events and corresponding vegetation responses in Xilin river basin were investigated based on the analysis of drought and high temperature dynamics during rapid growth stages(June to August)from 1982 to 2020.The results showed that the Frank-Copula was the most appropriate distribution function for combining SPI and STI.The SCDHI was well-fitted for quantify-ing the dependency of drought and high temperatures when displaying multi-scale spatiotemporal compara-bility and clear statistical significances.Changes of the drought conditions in the basin maintained basically stationary,while the high temperature events showed a significant upward trend.The climate of the basin generally tended to be warming and drying,with a slight aggravation of compound dry-heat events in July and August.The cooccurrence return period of the dry-heat events defined as SPI<-1.0 and STI>1.0 was about 10 years.Moreover,the sensitivity of vegetation to extreme climate conditions was closely related to the growth stage.Grassland vegetation had higher resistance to climate change in stable growth stage.关键词
干旱/高温/复合事件/Copula函数/草原植被/内陆河流域Key words
Drought/High temperature/Compound events/Copula function/Grassland vegetation/Inland river basin分类
农业科技引用本文复制引用
张仪萱,王怡璇,刘廷玺,段利民,时淑悦,刘婷..半干旱草原内陆河流域复合干热气候特征及其植被响应[J].中国草地学报,2025,47(2):8-20,13.基金项目
国家自然科学基金项目(51939006,52269005,U23A-2001) （51939006,52269005,U23A-2001）
内蒙古自治区高校青年科技英才项目(NJYT 22037) （NJYT 22037）
内蒙古农业大学青年教师科研能力提升专项(BR220104) （BR220104）
教育部创新团队发展计划项目(IRT17R60) （IRT17R60）
科技部重点领域科技创新团队项目(2015RA4013) （2015RA4013）
内蒙古自治区科技领军人才团队项目(2022LJRCO007) （2022LJRCO007）
内蒙古自治区教育厅一流学科科研专项项目(YLXKZX-NND-010) （YLXKZX-NND-010）
