丘陵区不同类型土壤入渗特性试验研究

Experimental Investigation of the Infiltration Features of Different Types of Soil in Hilly Area

土壤入渗性能是评价土壤水源涵养作用和抗侵蚀能力的重要指标。文中选取大同地区广泛分布的褐土、栗钙土、栗褐土和粗骨土四种典型类型的土壤,在室内进行了一维积水入渗试验,分析了不同类型土壤的入渗特性。结果表明:四种类型土壤的初始含水量对累积入渗量均有不同程度的影响,土壤初始含水量越大,土壤入渗能力下降越明显;土壤结构越密实,土壤入渗能力越差;土壤黏粒含量越大,相同入渗时间内,土壤累积入渗量越小,即土壤越黏重,其入渗能力越差。

Soil infiltration feature is an important index to evaluate the soil water conservation capacity and antierosion ability. Four typical types of soil which are cinnamon soil,chestnut soil,chestnut-cinnamon soil and skeleton soil that are widely distributed in Datong area were selected for one-dimensional water infiltration laboratory experiment.Infiltration features of different types of soil were analyzed. The results show that the initial moisture content of the four types of soil has different effects on cumulative infiltration volume. The greater the initial soil moisture content is,the more obviously the soil infiltration ability declines. The closer the soil texture is,the poorer the soil infiltration ability is.In the same infiltration time,soil with higher clay content has the fewer cumulative infiltration volume,that is,its infiltration ability is poorer.