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中文摘要：
采用气候倾向率方法,对兰州市1961-2003年逐月日照时数资料进行了统计分析。结果表明：近43年兰州年日照时数表现为极显著的减少趋势,平均每10年减少78.4h。冬季变化最大,其它各季也均为缓慢的减少趋势。兰州20世纪60-70年代春、夏季日照充足,秋、冬季日照偏少;80年代后期均为负距平,以春、冬季最为明显,90年代与80年代截然相反,季日照时数偏多,尤其是春、夏季。年日照时数偏多年份出现在20世纪60年代,而异常偏少年份多发生在20世纪80年代。年、季日照时数的显著减少与降水量的多少有关。
英文摘要：
Using the data of monthly sunshine duration and precipitation over Lanzhou from 1961 to 2003,the trend variation of the sunshine duration was analyzed by using linear trend analysis.Main results were as follows：（1）On an average in Lanzhou,the annual sunshine duration showed a significant decreasing tendency during recent 43 years with a decreasing rate of 78.4 h/10a.The decreasing trend occurred,especially in winter.（2）In the 1960s and1970s,the sunshine durations were more sufficient in spring and summer,while lower in autumn and winter.The sunshine duration of positive anomaly occurred in all seasons in the 1980s,especially in spring and winter.But to the contrary in the 1990s,the sunshine durations were higher in all seasons,especially in spring and summer.（3）Also,the annual sunshine durations were more anomalous years in the 1960s,whereas less anomalous years in the 1980s.（4）Results indicated that the decrease of sunshine duration was connected with precipitation.
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