Climate Change in Zhenglan Banner,Inner Mongolia in Recent 40 Years

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.