人工林地含沙径流的入渗特性研究

Influence of Sediment-laden Flow on Infiltration Capacity of Soil at Site of Afforestation

为探索人工林地含沙径流入渗性能 ,以便客观评价人工林的水源涵养作用 ,指导集水造林整地工程设计 ,采用双环法 ,对 2种土壤质地带上刺槐人工林地的浑水入渗性能 ,以及含沙量和泥沙粒度对土壤入渗性能的影响进行了研究。结果表明 ,含沙径流可显著削弱人工林地土壤的入渗性能 ,降低天然降水与土壤水的转换能力 ,其削减能力随着入渗水流含沙量、泥沙中小于 0 0 1mm物理性黏粒含量的增加或入渗历时的延长而增大 。

Based on field test of infiltration with sediment laden flow and sediment nonladen flow on Black locust at site of afforestation, the impact of sediment concentration and physical clay content of sediment laden flow on infiltration capacity of soil with different texture were studied. The results showed that sediment laden flow can obvious decrease the infiltration capacity of soil with light loam and midium loam, reduce the transfer capability between precipitation and soil moisture. The reduce degree of infiltration capacity, which was affected by the soil texture, was increased with increasing of physical clay content in sediment, sediment concentration of sediment laden flow and infiltration duration.