| Based on the daily temperature data during 1961~2009 from 9 meteorologjical stations in Urumqi region,
the fundamental spatial-temporal change characteristics of various agricultural-heat elements, such as the average annual
temperature，the average temperature on January and July，extreme minimum temperature and extreme maximum tempera ture in a year, frost-free period， the days of ≥0℃ and ≥10℃，annual accumulated temperature of ≥0℃ and ≥10℃, negative accumulated temperature in winter, mean daily temperature range from April to September were ana-lyzed by using the methods of linear regression and Kriging interpolation. The main results are obtained as follows:①Agricultural-heat resources is obviously different in various regions in Urumqi region, generally， the mean temperature of annual and July，extreme minimum and extreme maximum temperature in a year，frost free period, the days of≥0℃ and≥10℃，annual accumulated temperature of≥0℃ and≥10℃, mean daily temperature range from April to September is higher or more in plain and valley than that in mountainous areas. By the influence of inversion temperature in winter, January average temperature, extreme minimum temperature and negative accumulated temperature is higher in
the altitudinal belt from 900m to 2 100 m than that in other areas. ②In the background of global warming, agricultural-
heat resources have a significant increasing in recent 49 years in Urumqi region, generally ，the average annual tempera-
ture，the average temperature on January and July，extreme minimum temperature and extreme maximum temperature in a year, frost-free period,the days of ≥0℃ and ≥ 10℃, annual accumulated temperature of≥0℃ and ≥ 10℃, and
negative accumulated temperature have a increasing trend， while the mean temperature range from April to September has a decreasing trend. But the change rate of them varies in different regions in Urumqi region, and generally， the agricul
tural heat resources have a more increment in urban and plain than that in Tianshan mountainous area. Agricultural heat
resources increasing is a double-edged sword to agriculture and livestock production. Therefore, we must deal it with
the measures of drawing on the advantages and avoiding disadvantages to promoting the development of agricultural pro-
duction. |