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利用1961～2000年西藏不同气候农区旬降水量资料,分析了春小麦生育期的降水特征及趋势变化。结果发现,春小麦拔节～孕穗期降水变率较大,温暖半干旱农区、温暖半湿润农区易出现旱。抽穗～乳熟期半湿润农区多数年份的降水能够满足春小麦需水,且还有盈余。过去40年春小麦全生育期的降水量,在温暖半干旱农区1980年以前呈显著的减少趋势,1981年以后表现为显著的增加趋势。温暖半湿润农区呈明显的增加趋势。
Based on the data of ten-day precipitation in different climatic regions in Tibet from 1961 to 2000, the precipitation characteristics and trend changes of spring wheat during its growth period were analyzed. The results showed that the precipitation variability of spring wheat at jointing ~ booting stage was larger, and the drought was likely to occur in warm and semi-arid farmland and warm semi-humid farmland. Heading ~ milk mature semi-humid areas most of the year’s precipitation to meet the spring wheat water, and there are surpluses. In the past 40 years, the precipitation during the whole growth period of spring wheat showed a significant decrease trend in warm semi-arid farming area before 1980, and showed a significant increase trend after 1981. Warm and humid regions showed a clear trend of increase.