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采用定位观测、谐波分析以及灰色关联度等方法对典型流域所选的６个断面共５６个水分观测点的实测数据进行了分析，研究流域土壤水分动态变化规律．结果表明，土壤含水量年内变化主要受降雨和蒸发散的年内变化影响，明显分为干湿两季；土壤水分年内变化可划分为四个时期：春季土壤水分缓慢蒸发期、旱季土壤水分严重亏缺期、雨季土壤水分补偿期、冬春土壤水分相对稳定期．研究中利用标准差和变异系数对土壤水分垂直变化进行了分层，并用灰色关联度方法分析了各层次间土壤水分及其与期间降雨量的关系，得出土壤水分剖面分布可分为速变层、活跃层和次活跃层，林地水分活跃层较深，草、农、裸地水分活跃层偏上的土壤水分垂直分布规律
The measured data of 56 moisture observation points in 6 sections selected from typical watersheds were analyzed by means of positioning observation, harmonic analysis and gray relational degree, and the dynamic variation of soil moisture was studied. The results showed that the annual variation of soil water content was mainly influenced by the annual variation of precipitation and evapotranspiration, which was obviously divided into two periods. The annual variation of soil moisture could be divided into four periods: the slow evaporation of soil moisture in spring and the severe loss of soil moisture in dry season Shortages, compensation period of soil moisture in rainy season, soil moisture in winter and spring relatively stable period. In this study, the vertical variations of soil moisture were stratified by using standard deviation and coefficient of variation, and the relationship between soil moisture and rainfall during the periods was analyzed by gray relational degree method. It was concluded that the distribution of soil moisture profiles could be divided into three types: rapid change The vertical and horizontal distribution of soil moisture in the active layer of grassland, farmland and bare land