秦岭南麓小流域不同土地利用类型剖面粒度分析  

Comparison of Soil Particle Distribution Among Different Land Use Types in South Qinling Watershed

作　　者：王惠泽[1] 孙虎[1] 

机构地区：[1]陕西师范大学旅游与环境学院,西安710119

出　　处：《河南科学》2016年第12期2118-2123,共6页Henan Science

基　　金：国家自然科学基金(40071005);教育部科学技术重点项目(105152)

摘　　要：以陕西省宁陕县华严小流域为研究区,选择3类不同土地利用类型的地块,每10 cm深度为单位使用土钻打孔采集样品,采样深度60 cm,使用激光粒度仪处理采得的222个样本.分析土地利用系统和土地管理方式对土壤粒度的影响,以及整个小流域的土壤粒度分布规律.分析结果表明,研究区主要是砂质土壤,土壤质地较差;不同土地利用类型下黏土、粉砂和砂粒的分布不同;同一土地利用类型的土壤在小流域的不同位置上粒度分布不同,从中游到下游的变化比从上游到中游的变化要大;土地利用的强度会影响表层土壤粒度的分布;研究区有轻微的水土流失,不合理的土地利用会加剧土壤粗化的现象.In the experiment, Hua Yan watershed which is located in Ningshan County of Shaanxi Province is chosen as the research area. Three land parcels are used for different purposes. The soil samples are collected every time of the drill goes down to the depth of 10 cm. The utmost depth of soil in the experiment is 60 cm. 158 samples are processed and obtained by a laser particle analyzer. The experiment analyzes the effects of land use and land management on soil particles, and soil particle distribution in the entire watershed. From the experiment, the following conclusions are reached. Firstly, sandy soil is the main soil type in the research area and has bad soil texture. Secondly, for the different land use types, the distributions of lower clay, silt and sand are different. Thirdly, for the same type of land use, sold particle distribution varies at different locations of the watershed. The change of soil particle distribution from the middle reaches to the lower reaches grows greater than that from the upper reaches to the middle reaches. Additionally,soil particle distribution in topsoil is effected by the extent to which the land is exploited. Lastly, Water loss and soil erosion happen in the research area. Unreasonable land use worsens land coarsening.

关 键 词：秦岭南坡 小流域 土地利用类型 土壤粒度 

分 类 号：X825[环境科学与工程—环境工程] S153.2[农业科学—土壤学]