摘要
根据土壤水分定位观测结果，结合当地气候条件、作物生长过程和土壤物理性状等因子，对冀西北坝上风沙半干旱区旱坡地土壤水分季节性和垂直性变化进行了分析，得出了该区旱坡地土壤水分季节性变化，可概括为缓慢失墒期、耗墒期、恢复期、相对稳定期４个阶段；土壤水分垂直性变化是：０～５ｃｍ为速变层，５～１００ｃｍ为活跃层，１００ｃｍ以下为相对稳定层。
According to the results of fixed position observation of soil moisture content,local climatic condition,crop growth process and soil physical features,the seasonal and perpendicular dynamic changes of soil moisture content were analyzed in slope dryland in Bashang region,Hebei province.The seasonal change of soil moisture content was divided into the four stages:soil moisture slow lossing stage,soil moisture consuming stage,soil moisture restoring stage and relative stable stage.The perpendicular change of soil moisture content was divided into:fast changing layer(0～5cm),active layer(5～100cm) and relatively stable layer(>100cm).
