辽西北沙地流动沙丘土壤水分时空变化特征研究

以辽西北沙地流动沙丘为对象,研究了土壤水分运动的时空变化特征。结果表明:流动沙丘土壤含水率的时间变化与降雨有密切关系,春季土壤含水率较低,为0.1%～3.1%;夏季土壤含水率较高,为2.5%～5.1%;秋季土壤含水率略高于春季,为2.2%～3.6%。土壤含水率垂直变化位为:0～10cm土壤含水率变异程度较大,受降雨和蒸发影响强烈;10cm～80cm变异程度相对小些;80cm～120cm土壤含水率比较稳定。流动沙丘不同部位的土壤含水率受干沙层厚度频繁变化和降雨量影响显著,阴坡底含水率>阳坡底>阳坡中>丘顶>阴中。

Space-time Variety Characteristics of Soil Moisture on Mobile Dune in Liaoning Northwest Sandy Land

The space-time variety Characteristics of soil moisture content are studied on mobile dune in Liaoning Northwest Sandy land. The results show that soil moisture varied with rain Soil moisture content is 0.1%~3.1% in springtime, which is lower. Soil moisture content is 2.5%~5.1% in summer, which is higher. Soil moisture content in autumn is higher slightly than springtime, being2.2%~3.6%.The variation of soil moisture content is bigger at the depth of 0~10cm and effected on rainfall and evaporation intensively, smaller comparatively at the depth of 10~80cm, stable at the depth of 80~120cm.Soil moisture content of different locations on mobile dune is significantly effected on frequent thickness varieties of dry sand layer and rainfall, showing shady slope bottom>sunny slope bottom>sunny slope middle>top>shady slope bottom.