Impact of Climate Change on the Main Crops in the Middle Region of Hexi Corridor

Based on temperature,precipitation data collected from six counties of Zhangye in recent 30 years,and the yields and growth periods data of the main crops such as spring wheat and corn,the climate change feature and its impact on yields and growth periods of main crops were analyzed by means of statistic analysis and integral regression methods.Results show that the average temperature in the middle area of Hexi Corridor in recent 30 years presented increasing trend with the climate tendency rate of 3.85 ℃/100 a.The annual mean rainfall increased obviously,in last ten years,the annual mean rainfall was 210.5 mm,but in the 1980s,it was 191.1 mm.Climate warming advanced the seeding periods of spring wheat and corn,and stortened the growth period of spring wheat but extended corn’s.Increase in temperature and precipitation has different impacts on the growth period and yields of both spring wheat and corn,and the effects varied with the regional difference.