| Based on the data of average annual temperature, frost-free period and ≥10℃ accumulated temperature during 1971—2010 from 11 meteorological stations in Economic Zone of Northern Slope of Tianshan Mountain, using the linear regression analysis, Mann-Kendall mutation test, T-test and IDW interpolation, the spatial-temporal change characteristics of heat resources were analyzed. The results showed that: In recent 40 years, the annual average temperature, frost-free period and ≥10℃ accumulated temperature were increased by the tendency rate of 0.4 ℃·10a-1, 3.2 d·10a-1 and 87.2 ℃·d·10a-1 respectively. Also these elements had occurred the mutation in 1990s, the annual average temperature was increased by 1.1℃, frost-free period was increased by 8 d, and ≥10℃ accumulated temperature was increased by 239.4 ℃·d compared after and before mutation. Furthermore, with the era increasing, the increasing tendency of annual average temperature, frost-free period and ≥10℃ accumulated temperature were more notable. In space the heat resources in Northern Slope of Tianshan Mountain had significant regional difference and showed the distribution pattern as higher in northwestern and lower in eastern. And with the time change, the high value regions of the annual average temperature, frost-free period and ≥10℃ accumulated temperature have been expanded to west from the original Wusu and Kelamayi to the wide scope of west Jinghe, the low value regions were narrowed down to the Manas and Hutubi. At the same time, the increasing rate of heat resources in mid-east region, such as Changji, Miquan and Fukang were total higher than the middle and western regions, among them the heat resources increase in Changji City was the most significant. |