摘要
利用1961～2000年西藏不同气候型农区旬降水量资料,分析了青稞生育期的降水特征及趋势变化。结果表明:青稞拔节～孕穗期降水变率较大,此时温暖半干旱农区、温暖半湿润农区易出现旱情;抽穗～乳熟期半湿润农区多数年份的降水能够满足青稞需求,且还有盈余。过去40a青稞全生育期的降水量,在温暖半干旱农区,1980年以前呈显著的减少趋势,1981年开始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,而温凉半湿润农区表现为不显著的减少趋势。
Using the data of precipitation from 1961 to 2000 in different climatic zones of Tibet, the characteristics and variation trend of precipitation during growing period of highland barley are analyzed. The results show that the precipitation variability is relative large during jointing to booting stage, and the drought appears easily during this stage in the warm semiarid and semi-humid agricultural zone. The precipitation during heading to milk stage in the semi-humid zones meets the water requirement of highland barley in most years, and there is even surplus margin. In past 40 years, the precipitation change trend during the whole growth period of highland barley showed a remarkable decrease in the warm semiarid zone before 1980, while the increase of precipitation was significant after 1981; there was an obvious increase in the warm semi-humid zone and an insignificant decrease in the cool semi-humid zone.
出处
《干旱地区农业研究》
CSCD
北大核心
2004年第1期23-27,共5页
Agricultural Research in the Arid Areas
基金
西藏自治区科技厅重点科研项目(2002-43)"西藏农业气候资源区划
关键词
春青稞
需水关键期
降水
气候变化
spring highland barley
key water requirement period
precipitation
climatic change
