Climate Changes of Menglun in Xishuangbanna for the Last 40 Years

Based on the long-term observation data (1959-2000) of a meteorological station, which was set up inside the nature reserves in Xishuangbanna, Yunnan Province, the characteristics of local climate change is studied. The results in dicate that the annual mean air temperature has been gradually increasing since 1985, and with a more obvious trend in dry-hot season from March to April; meanw hile, there are some difference on increasing rate between the mean maximum and minimum temperatures; the annual precipitation attenuates remarkably with an ave rage rate of 53.0 mm/10yr from 1950 to 1990; the air relative humidity presents an obvious decreasing trend, especially in dry-hot season. The main cause of the climate change in this area is the change of tropical forest cover, combining i ts effects with global climate change.

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