关键词: font-family: 宋体, mso-bidi-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, ≥0 ℃积温')">mso-bidi-language: AR-SA">≥0 ℃积温, 持续日数, 时空变化, 突变特征, 新疆

Abstract: Global warming has become as an indisputable fact, under its impact, the agroclimatic resources, especially the heat resources, will be significantly changed in most parts of the world. The duration and accumulated temperature of temperature ≥0 ℃ were the important indices of evaluating heat resources. Xinjiang is an important area of agricultural and animal husbandry production in China, but heat shortage is one of the main factors restricting agricultural and animal husbandry production. Therefore, it is of an important practical significance to research the spatiotemporal changes of the first date, final date, duration and accumulated temperature of temperature ≥0 ℃under the background of global warming. In this paper, the methods of linear regression, accumulative anomaly, Ttest and ArcGISbased mixed interpolation were used to analyze the spatiotemporal changes of the first date, final date, duration and accumulated temperature of temperature ≥0 ℃ based on the daily temperature data observed by 95 meteorological stations in Xinjiang during the period of 1961-2010. The main results are as follows: the spatial distribution of the first date, final date, duration and accumulated temperature of temperature ≥0 ℃ was obviously different from different regions in Xinjiang. Generally, the first date of temperature ≥0 ℃came earlier in south Xinjiang than in north Xinjiang, and it also came earlier in the plains and basins than in the mountainous regions. The final date of temperature ≥0 ℃ was just opposite to the first date. The duration and accumulated temperature of temperature ≥0 ℃ were longer and higher in south Xinjiang than in north Xinjiang, and they were also longer and higher in the plains and basins than in the mountainous regions. Under the background of global warming, the mean first date of temperature ≥0 ℃ at 95 meteorological stations came earlier with a rate of -0.86 d·（10a）^-1, and its abrupt change occurred in 1997. The mean final date of temperature ≥0 ℃ came later with a rate of 1.72 d·（10a）^-1, and its abrupt change occurred in 1994. The duration and accumulated temperature of temperature ≥0 ℃ were in an increase trend with rates of 2.58 d·（10a）^-1and 66.26 ℃·d·（10a）^-1 respectively, and their abrupt change occurred in 1997. The change ranges before and after the abrupt change were quite different from different regions, generally, the first date of temperature ≥0 ℃ came earlier in south Xinjiang than in north Xinjiang, the final date of temperature ≥0 ℃ came later in the northern and mountainous areas than in the plains, basins and southern areas, the duration of temperature ≥0 ℃ was prolonged longer in the mountainous areas than in the plains and basins, and the increment of accumulated temperature of temperature ≥0 ℃ was higher in the plains and basins than in the mountainous areas.

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