Based on temperatures of 171 observations from 1961 to 2003 in Gansu province, the year mean temperature, highest temperature, lowest temperature, accumulated temperature above 0℃,10℃, and negative accumulated temperature beneath 0℃ were collected to analyze.

Due to doubling of CO2 concentration in the atmosphere, temperature will increase and will result in the changes of accumulated temperatures and lasting days, We applied a stochastic simulation model for daily mean temperatures to evaluate the impacts of climate changes on accumulated temperature and correspondent lasting days.

This article suggests an improved GIS interpolation technique for regional accumulative air temperature, with a method of decomposition of duration of accumulative temperature.

05) when the accumulated temperature at seedling stage(30 days after over-seeded) was over 500 ℃,and the intension of vertical cut of bermudagrass should be kept higher(≥50%) to get the ideal turf.