Response of grassland climate productivity to climate change infarming pastoral area of Inner Mongolia

Abstract: Based on the tendency of climate change including temperature and precipitation during the period 1979-2009 in Taipusi banner of Inner Mongolia, the Miami model and Thornthwaite Memorial model were used to determine the repines of Grassland Climate Productivity to Climate Change in FarmingPastoral Area. This study showed that the annual mean temperature of Taipusi Banner increased significantly by 0.62 ℃ per 10 years in the recent 30 years. In addition, seasonal temperature tended to rise clearly, in which winter temperature increased most significantly by 0.84 ℃ per 10 years. The annual precipitation showed a slight decreasing trend in by 5.3 mm per 10 years. Although there were different trend in seasonal precipitation, decreasing in spring precipitation and autumn precipitation and increasing in summer precipitation and winter precipitation, but all the trends were not clear. This study further showed that the Thornthwaite Memorial model could better coincides grassland climate productivity to the tendency of climate change in comparison with Miami model. The correlation analysis showed that the precipitation is the key factor limiting grassland climate productivity of farmingpastoral area in Inner Mongolia. It is calculated that warmwettype climate was beneficial to grassland climate productivity increasing with a yieldincreasing rate of 8.3% to 16.7%. In the future, if the climate tend to warmdrytype, grassland climate productivity would be affected from -4.8% to 3.5%.