Analysis On The Changes Of Agricultural Climate Resources In Inner Mongolia Autonomous Region During 1971-2010

Based on the meteorological data of 23 stations from 1971 to 2010, this paper studied the changes and distribution of temperature, precipitation, illumination and other agricultural meteorological elements of Inner Mongolia, using a variety of mathematical statistics methods of the climate tendency rate, Kriging interpolation, correlation analysis, precipitation and temperature homogeneity index, Thornth waite Memorial model, to analyzed the impacts of agricultural climate resources changes to agricultural production. The main conclusions are following:(1) The average annual temperature of Inner Mongolia during 1971-2010 fluctuated a rising trend, and a significant warming trend since 1990s. Seasonal temperature also showed a warming trend, and the temperature of spring and winter increased significantly,which were the largest contribution to the continued warming in the area. The average annual temperature and seasonal temperature of Inner Mongolia, were decreased from south and southeast to north and northwest, mainly due to latitude and elevation.The average annual temperature and seasonal temperature in various parts of Inner Mongolia showed a warming trend. Regional warming rate had significant difference, the temperature of north central area increased greatly.≧0℃and210℃ accumulated temperatures and duration days had an increasing trend; the spatial distribution characteristics of activity accumulated temperatures and duration days showed a decreasing trend from south and southeast to north and northwest.(2) The average annual precipitation from 1970s to mid-1980s in the whole region indicated an increasing trend, but showed a decreasing trend since the late 1980s. The precipitation trend in spring and winter was rising, which was decreasing in summer and autumn. The average annual precipitation and seasonal precipitation except winter precipitation, was diminishing in east-west direction; in winter, the spatial distribution of rainfall was slightly different, the maximum precipitation appeared in the western region of Hulun Buir, may be associated with topography. There was a decreasing trend in the eastern and central region, other parts in Inner Mongolia showed an increasing trend. The spring precipitation increased in the most part of Inner Mongolia; the summer precipitation decreased in the central region; the autumn precipitation decreased in the eastern region, but increased in the western part; the climate tendency rate in winter was decreasing in southeast-northwest direction. The S index indicated an upward trend, that Inner Mongolia had a trend of drought; drought was significantly worse since the late 1980s. Seasonal drought trend was consistent with annual drought trend, getting worse since 1990s.(3) The annual, seasonal average sunshine hours from 1971 to 2010 showed a downward trend in volatility. Spring sunshine hours had the most obvious downward trend, the second is winter sunshine hours. The annual, seasonal average sunshine hours in Inner Mongolia indicated a trend of decreasing from southwest to northeast.The sunshine hours of the vast majority decreased, which was diminishing from northeast to southwest.(4) The annual crop climate potential productivity from 1970s to the mid-1980s had a tendency of reduction in Inner Mongolia, but showed a downward trend since the late 1980s. The crop climate potential productivity in spring had a rising trend in fluctuation; The crop climate potential productivity in summer and autumn decreased, and summer was more significant than autumn.The planting boundary of cooked three times two years expanded to north, east.The distribution region of cooked three times increased significantly since 1990s.