中文摘要：

气候变化特征对于当地适应气候变化政策及制定相应的管理对策具有重要意义,利用内蒙古锡林郭勒盟正蓝旗1970—2009年气温和降水资料,结合回归分析对该旗气候变化的主要特征进行了分析。结果表明：内蒙古正蓝旗气温呈明显的上升趋势,变化倾向率为0.57℃.（10a）-1,40 a平均气温为2.26℃,其中21世纪初前10 a上升幅度最大,其年代平均气温攀升至峰值,达到3.07℃;降水量也呈上升趋势,其变化倾向率为4.85 mm.（10a）-1,40 a平均降水量为352.31 mm,其中20世纪90年代降水量最高,达到398.74 mm,而21世纪初前10 a降水量迅速下降,成为近40 a降水量最低点,低于多年平均降水量19.62 mm。总体而言,正蓝旗20世纪70年代趋于相对干冷,80年代则由相对干冷向暖湿发展的过渡期,而90年代正蓝旗呈相对明显的暖湿化趋势,21世纪前10 a降水量减少和气温继续升高,出现暖干化趋势。

英文摘要：

There are many types of grasslands in Inner Mongolia,and grasslands are of extremely sensitive to climate change.Climate change is not only an important factor in assessing regional ecology and environment,but also a research focus all over the world in recent years.The study on climate change is of great significance for making policy and working out management measures so as to adapt local climate change.In this paper,the main characteristics of climate change in the study area were analyzed using regression analysis based on the temperature and precipitation data observed in Zhenglan Banner,Inner Mongolia during the period of 1970-2009.The results show that the temperature in the banner in recent decades was in an increase trend,its change trend rate was 0.57 ℃·（10a）-1,and the average annual temperature in recent 40 years was 2.26 ℃,in which the temperature increase was the most significant in the first decade of this century,and the annual temperature was up to 3.07 ℃.Precipitation was also in an increase trend,its change trend rate was 4.85 mm·（10a）-1,the average annual precipitation in recent 40 years was 352.31 mm,in which the annual precipitation was the highest（398.74 mm） in the 1990s.However,the annual precipitation was sharply decreased and down to the lowest value in the first decade of this century since recent 40 years,and it was 19.62 mm lower than the average.Temporally,it was relatively dry and cold in the banner in the 1970s,and began to become warming and wetting in the 1980s,more warming and wetting in the 1990s,and warming and drying in the first decade of this century.