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。
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