关键词: 浑善达克沙地地区, 气候变化, 变异系数, 全球变化

Abstract: Using the climatic data in the last 50 years of 8 typical meteorological stations in the Otindag Sandy Land region, and adopting drought-waterlogging grade index during 1903-1975 in the south of Xilingol League, this paper analyzed the temporal-spatial climatic change characteristics with the help of Microsoft Excel 2000. During the last 50 years, the trend of temperature rising in the whole region is not only agreed with the global warming, but also the warming extent is more obvious. There are greater differences between dry and wet in different decades, whichever in the view of 100 years or 50 years. However, the trend of precipitation change is not similar. In the last 50 years, the precipitation not only decreased accompanying with undulation, but also presented differences among regions. Many evidences showed that the North-West part of the Otindag Sandy Land region with typical Zhurihe station had more obvious warming and drying trend than the middle-north part and the south-east part, such as air temperature, precipitation, evaporation and annual mean relative humidity, and there maybe will become more awful. The annual mean wind velocity in the whole region is decreasing since 1970. But the dust-storm in the west part of this region was existent at all times. Although the east part had obvious decrease after 1980, the frequent dust-storm in recent years challenged us the future of the east.

Key words: the Otindag Sandy Land region, climatic change, coefficient of variability, global change