摘要
土壤湿度作为生态系统的重要参数,是影响青藏高原高寒草地生态承载力和草地恢复重建的关键因素之一。本研究基于温度植被旱情指数(temperature–vegetation dryness index,TVDI)分析了青藏高原腹地生长季土壤湿度的时空变化特征和变化趋势,结合气象站点数据,采用偏相关分析研究了土壤湿度变化对气候因子的响应。结果表明,2001-2018年青藏高原腹地生长季平均土壤湿度表现为北部偏湿润、东北部和西南部偏干旱的空间分布特征。土壤湿度湿润、偏湿、正常、偏干、干旱的面积占比分别为1.14%、29.24%、37.68%、30.09%和1.85%。2001-2018年青藏高原腹地生长季南部土壤湿度呈现显著变干的趋势,北部和东北部地区趋于变湿,整体上土壤湿度呈降低趋势。研究区北部以及东北部区域受降水影响显著,而西南部地区受气温影响较大。
Soil moisture is one of the key factors affecting the ecological capacity and regeneration of alpine grassland in the Qinghai-Tibet Plateau.Using the temperature–vegetation dryness index(TVDI),we analyzed spatiotemporal variation and dynamic trends in soil moisture during the growing season in this area.In order to study the response of soil moisture to climate factors,correlation analysis was used to combine these data with data from meteorological stations in the study area.The results showed that during growing season from 2001 to 2018,the soil was on average humid in the northern part of the hinterland of the Qinghai-Tibet Plateau,while it was arid in the northeast and southwest.The proportions of wet,moist,normal,arid,and dry soil were 1.14%,29.24%,37.68%,30.09%,and 1.85%,respectively.In the past 18 years,the soil in the southern part of the study area showed a significant drying trend,while that in the north and northeast tended to become wetter.Soil moisture decreased in most areas.The northern and northeastern regions of the study area were significantly affected by precipitation,while the southwestern region was significantly affected by temperature.
作者
王娜
易桂花
张廷斌
秦岩宾
李景吉
别小娟
计博文
WANG Na;YI Guihua;ZHANG Tingbin;QIN Yanbin;LI Jingji;BIE Xiaojuan;JI Bowen(College of Earth Science,Chengdu University of Technology,Chengdu 610059,Sichuan,China;College of Tourism and Urban-Rural Planning,Chengdu University of Technology,Chengdu 610059,Sichuan,China;State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution(Chengdu University of Technology),Chengdu 610059,Sichuan,China;College of Ecological Environment,Chengdu University of Technology,Chengdu 610059,Sichuan,China)
出处
《草业科学》
CAS
CSCD
2020年第11期2185-2197,共13页
Pratacultural Science
基金
国家自然科学基金项目(41801099)
第二次青藏高原综合科学考察研究(2019QZKK0307)
四川省安全监管局(煤监局)安全生产科技项目(aj20170517210246)。
关键词
土壤湿度
温度植被旱情指数
气候因子
趋势分析
相关分析
时空变化
青藏高原
soil moisture
temperature vegetation drought index
climate factor
trend analysis
correlation analysis
spatiotemporal variation
Qinghai-Tibet Plateau
