Leaf area index and surface soil moisture are two basic factors of controlling evaporation.

叶面积指数和表层土壤含水量是控制蒸发的两个基本因素。

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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。

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With a view to the arid-wet index constructed by precipitation and evaporation synthetically, it may be objective to reflect the climate arid-wet evolution characteristics in northwestern area.

重点考虑降水和蒸发因素所构造的干湿指数可以更加客观地反映西北气候干湿演变特征。

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