我国南方红壤丘陵区崩岗侵蚀的分布及其环境背景分析

Analysis of the Distribution and Environmental Surroundings of Collapsed Hills Land of Red Soil in South of China

崩岗是华南地区分布最普遍、发育最旺盛和危害最严重的侵蚀类型。本文就崩岗侵蚀的地域分布及其特点进行了较全面的阐述。崩岗发育程度大致与华南海岸线相平行地自东南向西北逐渐减弱。主要在花岗岩类母质残积物上发生。花岗岩地质年龄自西北向东南越来越年轻 ,但残积红土发育的强度却是相应增强的 ,厚度自北向南逐渐增厚。

In the hilly land of red soil in south of China, collapsed hills are most commonly distributed with extremely vigorous development and thus have been regarded as the most harmful erosion type. This paper summaries the overall distribution of the collapsed hills in the areas and their characteristics. The development of the collapsed hills is approximately parallel with the seacoast of south of China with its vigor gradually reduced from southeast to northwest. The collapsed hills mainly take place in residual deposits of granite parents. The geological age of the granite becomes younger from the northwest to southeast while the development of the residual red soil is more vigorous in younger ones with its thickness and severe erosion of the collapsed hills are corresponding to the areas with two-hamped type torrential rain.