南方花岗岩区的土壤侵蚀及其防治

Soil Erosion and Its Control In the Granite Region of Southern China

本文研究了我国南方花岗岩地区土壤侵蚀的分布现状,成因规律及崩岗发生的机理。由抗冲指数和水稳性指数综合指标确定的土壤耐蚀冲性资料表明,花岗岩母质红壤的耐蚀冲性最小,低于变质岩红壤,第四纪红土红壤和紫色土,最易遭到侵蚀。应用侵蚀因子半定量记分法,确定了目前有森林覆盖的花岗岩区,仍具有极大的侵蚀潜在危险性,必须注意预防土壤侵蚀的发生。

This paper deals with the present distribution and genisis rules of soil erosion and the occurence of collapse mechanics in the granite region of South China. The data of soil teleranee erodibility determined by the comprehensive erosion-resistant indexes and watertable indexes indicate that the tolerance erodibility of red earth on the granite parent material is the minimum, being lower than that of varied rock red soil. Quaternary red earth and purple soil are liable to be eroded. The granite region presently covered with forests still has the extremely great potential risks of soil erosion determined by the erosionfactor score—semi—quantitative method. Therefore, great attention should be paid to the prevention of the occurence of soil erosion.