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通过对祁连山林区云杉林、圆柏林、灌丛林和牧草地等 4种主要植被类型土壤水分动态进行长期定位研究 ,揭示出生长季节内各植被类型的土壤水分动态变化规律。从土壤水分的变化特征 ,土壤水分有效性等几个方面对祁连山林区主要植被类型的土壤水分条件进行了分析与评价 ,表明祁连山林区主要植被类型的土壤水分垂直变化可分为 :土壤水分弱利用层、土壤水分利用层、土壤水分调节层 ;林地土壤水分的季节变化可分为 :土壤水分消耗期、土壤水分补偿期、土壤水分消退期、土壤水分稳定期 4个时期。根据土壤水分对植物的有效性 ,将土壤水分划分为易效水、中效水和难效水三种状态 ,评价土壤水分有效性认为云杉林水分供应状况最好。
Through the long-term localization of soil moisture dynamics in four main vegetation types, including spruce, polonium, shrub and pasture in Qilian Mountains, the dynamic changes of soil moisture in different vegetation types in the growing season were revealed. The soil moisture conditions of the main vegetation types in Qilian Mountains forest area were analyzed and evaluated from the aspects of soil water characteristics and soil water availability. The results showed that the vertical variations of soil moisture in the main vegetation types in Qilian Mountains forest area could be divided into three types: soil moisture Weak utilization layer, soil water use layer and soil moisture regulation layer. The seasonal variation of forest soil moisture can be divided into four periods: soil water consumption period, soil moisture compensation period, soil water depletion period and soil moisture stability period. According to the effectiveness of soil moisture on plants, the soil moisture is divided into three types: easy-effect water, medium-efficiency water and difficult-to-use water. The assessment of soil water availability suggests that water supply is the best.