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Climate Change in Tropical Area of Southwestern China Since 1950s

HE Yun-Ling1,2,ZHANG Yi-Ping1,YANG Xiao-Bo3(1.Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Kunming,Yunnan 650223;2.Graduate University of Chinese Academy of Sciences,Beijing 100049;3.School of Resource,Environment & Earth Science,Yunnan University,Kunming,Yunnan 650091)  
Up to now,studies on climate change are,more and often,concerned with global or national scale.It is noted that the climate change is not globally uniform.Regional variations can be much larger and considerable spatial and temporal variations may exist between climatically different regions.The climate of a specified location can not be considered a constant environmental factor.In addition,a climate change in a specific region or nation is of particular interest to that region and its economic activity.The aim of this paper is to present a responsibility of a region to global change by studying climate characteristics and change trends of a specific region,the tropical area of southwestern China.Based on long-term meteorological data of 6 meteorological stations in Xishuangbanna of Yunnan Province,the spatial and temporal distribution of change trend for temperature and precipitation are studied.The results show that the general trend of climate change in Xishuangbanna is basically the same with that in China and even in the world.The mean annual air temperature has been gradually increasing,and with an average trend of 0.0165-0.0334 ℃/a.Meanwhile,there are some differences on increasing rate between the mean maximum and mean minimum temperature.The annual precipitation changes complicatedly with an entire decreasing trend.The air relative humidity presents an obvious decreasing trend.In addition,the climate change trends show the differences that exist in the various regions and the notable seasonal variations,and the temporal and spatial distribution of climate characteristics and change amplitude is different in different regions.
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