| Under the background of the global warming, concerning the regional characteristics at the same time, we aimed at our investigation into the impacts of climate change on different regions in Inner Mongolia.The regular observed data used in this study are from 52 meteorological stations in Inner Mongolia for 1961-2005. Some classical statistical methods have been used to study characteristics of the climate change, such as trend, correlative correlation, climate variation analyses and anomaly cumulative methods and so on . The results indicate: (1) under the background of the global warming, temperatures of different areas in Inner Mongolia are on the rise. The mean temperature of the whole region has increased by 2-3℃during the past 50 years (1961-2005), and the increased range of mean minimum temperature is above the mean climate and mean maximum temperature of the region. Winter is the most significant season for increasing temperatures of the four seasons, it has risen by more than 3℃. The second significant season is spring and the last one is summer with an increasing temperature by about 1℃. In addition, the number of hot days is increasing year by year and the number of clod days is decreasing quickly. It can be deduced that the main contribution of the warmer climate is the rising temperature in winter of Inner Mongolia. (2) The temperature variation of Inner Mongolia has shown a fluctuant pattern in clod and warm. There was an abrupt temperature change about 1986, since then, the temperature of the region has risen notably. For different areas in Inner Mongolia during the recent 50 years, the trend indices of their temperatures are positive, which have revealed a unanimous trend of becoming warm, and the biggest increases occurred in the north part of Hulunbeier City. The temperature has increased by more than 3℃within the past 50 years, and the smallest range of temperature increase is in Chifeng City and the south part of Tongliao City, increased by about 1-2℃. The phenomenon that the biggest changes of temperature are all appeared in the east of Inner Mongolia should be noticed, indicates that the eastern region is a sensitive area to temperature variations. (3) It has shown a faintly increasing trend of total precipitation in Inner Mongolia. The mean rainfall of the region has increased by about 48mm during 1961-2005. Most precipitations indices are positive, the range of it increased and the precipitation distributions in space have changed specifically, especially in the east of Inner Mongolia, the amount of rainfall has indicated a declining trend. In opposite, a rising trend has been revealed for the mid-western areas of Inner Mongolia since the 1990s. (4) Different areas and seasons in Inner Mongolia have shown different responds to climate change. The response of the mid-western areas is significantly higher than that of the east. The earliest warm spring started in 1983, autumn and winter began in 1987, and the latest becoming warm season is summer, started in 1993.The results show that under the condition of the global warming, there are different responses to the climate change in different areas in Inner Mongolia. The trend of becoming drier and warmer for the future time has been shown out for the total region. It would be unfavorable for the region to ecosystem recovery with this kind of climate trend, especially for the areas where are very sensitive to the climate change on the agriculture, animal husbandry and ecosystems. These possible phenomena should be highly attended by the relative authorities.
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