1986-2015年极端降水指标变化及其对中国草地植被物候的影响  

Changes in Extreme Precipitation Indicators and Their Effects on Vegetation Phenology in Chinese Grasslands from 1986 to 2015

作　　者：魏红梅 吴静[1] 秦格霞 Wei Hongmei;Wu Jing;Qin Gexia(College of Resources and Environment,Gansu Agricultural University,Lanzhou Gansu 730070,China)

机构地区：[1]甘肃农业大学资源与环境学院,甘肃兰州730070

出　　处：《国土与自然资源研究》2024年第1期82-87,共6页Territory & Natural Resources Study

基　　金：国家自然科学基金资助项目(31760693)。

摘　　要：研究我国草地植被生长季始期及末期对极端降水事件变化的响应是理解区域陆地生态系统生产力历史和未来变化机制的关键。本文利用草地、物候和极端降水数据,辅以Sen趋势分析和Pearson相关分析法研究了1986-2015年我国不同极端降水指标变化趋势及其对草地物候影响。结果表明,(1)我国极端降水事件的水量和强度都有显著增加的趋势,从空间分布来看,西部特别是西北地区有较明显增长。(2)草地植被生长季始期与长时序低温事件、持续干旱事件和极端强降水事件之间有显著相关性。(3)草地植被生长季末期与极端强降水,长时序极端干旱、湿润之间具有显著相关性。此研究对科学分析极端降水变化及其对植被物候的影响,促进植被生态恢复,制定行之有效的防灾减灾措施、构建稳定的生态屏障具有指导意义。Studying the response of grassland vegetation to extreme precipitation events at the beginning and end of the growing season in my country is the key to understanding the historical and future change mechanisms of regional terrestrial ecosystem productivity.This paper uses grassland,phenology and extreme precipitation data,supplemented by Sen trend analysis and Pearson correlation analysis,to study the changing trends of different extreme precipitation indicators in my country and their impact on grassland phenology from 1986 to 2015.The results show that,(1)the water volume and intensity of extreme precipitation events in my country have a significant increase trend.From the perspective of spatial distribution,the western region,especially the northwest region,has a relatively obvious increase.(2) There was a significant correlation between the beginning of the grassland vegetation growing season and long-term low temperature events,persistent drought events and extreme heavy precipitation events.(3) There is a significant correlation between the end of the grassland vegetation growing season and extreme heavy precipitation and long-term extreme drought and humidity.This research has guiding significance for scientifically analyzing changes in extreme precipitation and its impact on vegetation phenology,promoting vegetation ecological restoration,formulating effective disaster prevention and mitigation measures,and building a stable ecological barrier.

关 键 词：极端天气事件 草地植被 物候 相关性 

分 类 号：S165.21[农业科学—农业气象学]