A kind of K drought index and its criterion are made by using spring precipitation and evaporation data of 140 stations in Northwest China from 1971-2000.
用西北地区140个气象站1971～2000年的春季降水、蒸发资料，计算了一种K干旱指数，并制定了干旱标准，分析了西北春季干旱的气候特征。
This paper summarized hydrological characters, distribution of precipitation and runoff in arid and semiarid regions in the northwest of China on the basis of the previous researches.
本文在前人研究基础上，总结了中国西北部干旱半干旱地区的水文特性，降水及径流的时空分布规律。
In desertification areas of northwest China, the water content in the unsaturated zone originates from atmospheric precipitation and from water condensation.
西北荒漠化地区，包气带中的水分除来自大气降水外，还来自凝结水。
Keriya oasis is located in the Northwest extreme arid region of China, where there is less precipitation and a deficiency of groundwater.
新疆于田绿洲地处我国西北极端干旱地区，降水稀少，地下水贫乏。
The results indicated that the annual precipitation reduced in North China, Northeast China, the east part of Northwest China, and Southwest China, while the SAT generally increased in these regions.
结果表明：降水减少的地区主要位于我国北方的西北东部、华北及东北；在南方，西南的降水减少趋势与上述地区具有类似特征。
The results indicated that the annual precipitation reduced in North China, Northeast China, the east part of Northwest China, and Southwest China, while the SAT generally increased in these regions.
结果表明：降水减少的地区主要位于我国北方的西北东部、华北及东北；在南方，西南的降水减少趋势与上述地区具有类似特征。
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