利用2004年祁连山北坡五类天然草地生长季的土壤水分数据和同期的气象资料,以回归和相关分析的方法分析了气象因子对五类天然草地土壤水分动态变化的影响.结果表明:(1)土壤水分的动态主要受降水量及其季节分配的影响,并建立了降水量对土壤含水量的回归方程;(2)利用ASCE-PM模型计算了五类草地群落的潜在蒸散量,潜在蒸散量对0～20 cm土层水分含量影响显著(P<0.05),而愈向土壤深层,影响愈不明显;(3)土壤含水量对气温、土壤温度、相对湿度和近地面风速的响应由土壤表层至深层均呈递减趋势.%We conducted a field study by regression and correlation analysis to examine the relationships between soil moisture and meteorological factors for five kinds of grassland in the northern slopes of the Mountains Qilian; and soil moisture was collected from the study site along with synchronous meteorological data in 2004 for analysis. The results showed that (1) Dynamic change of soil moisture was determined by precipitation and its seasonal distribution, and regression equation between precipitation and soil moisture were set up. (2) The potential evapotranspiration of five types of grassland was analysed based on ASCE-PM model. The relationship between potential evapetranspiration and soil moisture in 0 ～ 20 cm soil layer was significant(P ＜ 0.05). But there was no correlation between potential evapotranspiration and other soil layers. (3) Air temperature, soil temperature, relative humidity and near-ground wind speed exert an influence on soil moisture, and the responses of soil moisture to these factors were descending along the soil layer depth.
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