西部山区道路建设毁损土地的退化及其环境效应 Ⅱ.川藏公路典型路段地区的土壤退化与土壤系统分类

Degradation and environmental effects of damaged land by road construction in mountainous region,western China:Ⅱ.soil degradation and taxonomic classi-fication in typical section of Sichuan-Tibet highway

中国西部大开发,道路工程建设迅速发展。但对道路周边的环境影响较大。引起土地退化较为严重。从土壤系统分类上研究了道路工程毁损土壤类型演化特征。与未受道路工程影响的土壤进行比较研究表明:道路工程毁损土壤,在剖面形态和特性上有很大的变化。土壤在诊断层和诊断特性上已有所不同。以土壤系统分类可看出,道路工程毁损引起严重的土壤退化,可在土壤高级分类单元上即体现出明显的演化特征。采用土壤系统分类制研究土地退化,比土壤发生分类制更有优势。

Road construction increased quickly during West Exploitation in China and greatly affected the environment along line, as a result, the soil degradation in both sides of road was serious. In this paper, the features of soil type succession in damaged land by road construction were analyzed in means of soil taxonomic classification. The morphology and features of soil profiles, comparing with the undisturbed soil, varied after the road construction, at the same time, the same result happened for the soil diagnostic horizon and characteristic, thus the soil degradation induced by road construction had the features of negative succession （from higher to lower classification unit） according to soil taxonomic classification. Using soil taxonomic classification is advantageous to soil genetic classification in studying on soil degradation.