Variation of Thornthwaite Moisture Index in Hengduan Mountains, China

作     者：ZHU Guofeng QIN Dahe TONG Huali LIU Yuanfeng LI Jiafang CHEN Dongdong WANG Kai HU Pengfei ZHU Guofeng;QIN Dahe;TONG Huali;LIU Yuanfeng;LI Jiafang;CHEN Dongdong;WANG Kai;HU Pengfei

作者机构：College of Geography and Environment Science Northwest Normal University State Key Laboratory of Cryosphere Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences 

出 版 物：《Chinese Geographical Science》 (中国地理科学（英文版）)

年 卷 期：2016年第26卷第5期

页      面：687-702页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：Under the auspices of Chinese Postdoctoral Science Foundation(No.2015M570864) Open-ended Fund of State Key Laboratory of Cryosphere Sciences,Chinese Academy of Sciences(No.SKLCS-OP-2014-11) Northwest Normal University Young Teachers Scientific Research Ability Promotion Plan(No.NWNU-LKQN-13-10) National Natural Science Foundation of China(No.41273010,41271133) Major National Research Projects of China(No.2013CBA01808) 

主　　题：Thomthwaite moisture index Normalized Difference Vegetation Index (NDVI) Kriging interpolation Hengduan Mountains 

摘      要：The Thornthwaite moisture index, an index of the supply of water （precipitation） in an area relative to the climatic demand for water （potential evapotranspiration）, was used to examine the spatial and temporal variation of drought and to verify the influence of environmental factors on the drought in the Hengduan Mountains, China. Results indicate that the Thornthwaite moisture index in the Hengduan Mountains had been increasing since 1960 with a rate of 0.1938/yr. Annual Thomthwaite moisture index in Hengduan Mountains was between -97.47 and 67.43 and the spatial heterogeneity was obvious in different seasons. Thomthwaite moisture index was high in the north and low in the south, and the monsoon rainfall had a significant impact on its spatial distribution. The tendency rate of Thomthwaite moisture index variation varied in different seasons, and the increasing trends in spring were greater than that in summer and autumn. However, the Thomthwaite moisture index decreased in winter. Thomthwaite moisture index increased greatly in the north and there was a small growth in the south of Hengduan Mountains. The increase of precipitation and decrease of evaporation lead to the increase of Thomthwaite moisture index. Thornthwaite moisture index has strong correlation with vegetation coverage. It can be seen that the correlation between Normalized Difference Vegetation Index （NDVI） and Thomthwaite moisture index was positive in spring and summer, but negative in autumn and winter. Correlation between Thornthwaite moisture index and relative soil relative moisture content was positive in spring, summer and autumn, but negative in winter. The typical mountainous terrain affect the distribu- tion of temperature, precipitation, wind speed and other meteorological factors in this region, and then affect the spatial distribution of Thomthwaite moisture index. The unique ridge-gorge terrain caused the continuity of water-heat distribution from the north to south, and the water-h