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The Rules of drought and the development of water-saving agriculture in southwest China

ZHU Zhonglin1,ZHAO Xiejing1,WANG Changtao1,HOU Luchuan1,2 1.Key Lab of MOA-Agricultural Resources and Environment in the Upper Reaches of Yangtze River,Sichuan Academy of Agricultural Science,Chengdu 610066,China;2.Department of Resource and Environment,Sichuan Agricultural University,Ya'an 625014,China  
The southwest region excluding Tibet,with 19.2% of national population,19.1% of national farmland and 14.9% of the gross national products in agriculture,forestry,animal husbandry and fishery,is very important and highly potential in agricultural production in China.Drought,however,is considered as the main factor that confines further development of agriculture in the area.This article analyzed the features and determined the patterns of drought occurred in the region including seasonal drought severity,drought regionalization,drought diversity,and continuity and high-frequency drought.It concluded that spring drought,summer drought and the hot season drought are the biggest threat to agriculture.Meanwhile,from the viewpoint of nature and economic de-velopment,it indicated that the pocket rainfalls,low use efficiency of water resources,serious soil erosion and the lagging irrigation engineering projects are the major causes for drought in this area.On the basis of this study,a number of measures to reduce drought are suggested including improving use efficiency of rainfalls,speeding up exploitation of water resources and developing bio-technology for high water use efficiency.
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