元谋干热河谷旱季不同林地土壤的渗透性能研究

A Study on Soil Water Infiltration Characteristics of Forest Land of Yuanmou Dry and Hot Valley in Dry Season

在对元谋干热河谷旱季5种林分林地以及膨胀土和裸地土壤物理性状测定的基础上，对其土壤的渗透性能进行了研究。结果表明，不同林地土壤的容重、含水率、土壤的总孔隙度以及初渗和稳渗速率均有一定差异。同一林分内林地不同土层土壤的初渗和稳渗速率表现出的规律，是表层土壤（0～15cm）的渗透性能要优于下层土壤的渗透性能；而不同林分，其林地土壤平均初渗能力的大小顺序为：加勒比松-车桑子混交林〉加勒比松纯林〉山合欢纯林〉桉树纯林〉山毛豆-车桑子混交林〉裸地〉膨胀土。

On the basis of soil physical index determination of expansive soil, bare land soil and five forest land types of Yuanmou dry and hot valley in dry season, the soil infiltration characteristics of these forest land types were studied. The results showed that there were differences on soil bulk density, water content, soil porosity, initial soil water infiltration rate and stable soil water infiltration rate. The soil water infiltration rate of soil at surface layer （0 15 cm） was higher than that of underground soil. Among different stands, the initial soil water infiltration rates were in the order of Pings caribaea x Dodonaea viscose stand 〉 Pings caribaea pure stand 〉 Albizzia kalkora pure stand 〉 Eucalyptus pure stand 〉 Tephrosia candida x Dodonaea viscose stand 〉 bare land 〉 expansive soil.