陕西王东沟小流域野外土壤入渗试验研究

以野外土壤入渗试验为依据，利用时域反射仪进行了土壤水分动态变化的观测，并分析了积水入渗过程中土壤水分的动态变化规津及停渗后土壤水分再分布规律。结果表明：野外土壤积水入渗过程中，土体内任—埋深处士壤含水率的变化一般经历稳定不变、缓慢上升、急剧上升和再稳定4个阶段，不同土地利用类型的土壤每一阶段听经历的时间长短不同；积水深度越大，土壤剖面含水率、入渗量变化越明显，湿润锋的推移也越快；停渗后土壤水分再分布规律表现为表层0～10cm土壤含水率急剧减小，10～70cm土壤含水率开始呈增大趋势，然后再逐渐减小，70cm以下的土壤含水率略有变化。

Experimental Study of Field Soil Filtration in Wangdonggou Watershed in Shaanxi Province

On the basis of soil infiltration experiments in fields and observation of dynamic evolution of soil noisture through Shiyu Reflected device the laws of soil moisture dynamics change and re-distribution of soil moisture after infiltration stops are analyzed in the infiltration processes of accumulation of water. The results showed that the change of soil moisture content in any depth goes generally through four stages, stable, slowly rise, steep rise and stable again, during infiltration process of accumulation water in field soil body, and the duration for each stage is different for soils with different land cultivation; the larger volume the accumulation water is, the more evident changes of water infiltration amount and soil moisture content at the section are; the re-distribution law of soil moisture after infiltration stops is that there is steep decrease of soil moisture content in the surface soil from 0 to 10 cm deep, increase tendency of soil moisture content in the depth of 10 to 70 cm, and a little change of soil moisture content in the depth of below 70 cm.