砂石含量及粒径对红壤水分扩散率的影响  

Effect of Rock Fragment Content and Size on Red Soil Water Diffusivity

作　　者：吴凤平[1] 王辉[1,2] 卢霞[1] 罗静波[1] 姚帮松[1] 

机构地区：[1]湖南农业大学工学院,湖南长沙410128 [2]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《水土保持学报》2009年第2期228-231,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金(40801107);黄土高原土壤侵蚀与旱地农业国家重点室基金(10501-168);湖南省教育厅科学基金(07B033)

摘　　要：基于4种不同砂石含量（0%,10%,20%,30%）及3种不同砂石粒径（0.2-0.5 cm,0.5-1.0 cm,1.0-2.0cm）所组成的土石混合介质,分别采用水平土柱入渗试验装置进行土壤水分入渗试验。试验结果表明,土壤中砂石含量显著降低了湿润锋推移速度,砂石含量和粒径对土壤水分累积入渗量的减少均有不同程度影响;土壤水分扩散率值随着砂石含量增多而增大,且与土壤含水率呈正线性关系,但砂石粒径对其扩散率的影响并不显著。Their presence of rock fragments does have some effects on some physical properties of soil and water infiltration process. Based on the horizontal soil column infiltration experiments, stony soils consisting of different rock fragment contents and sizes were investigated about water infiltration characteristics. The results showed that rock fragment in soil significantly baffled the movement of wetting front, and rock fragment content and size had different extent influence on decreasing the amount of cumulative infiltration. The unsaturated water diffusivity increased greatly with the rock fragment content increasing, and was positive linear to the soil water content. However, rock fragment size had little influence on the diffusivity.

关 键 词：土石混合介质 红壤 入渗 砂石 扩散率 

分 类 号：S152.3[农业科学—土壤学] S152.7[农业科学—农业基础科学]