Abstract:The area of red soil in southern China is 2.112×10~6 km~2, accounting for 22% of the total area of China. Because of rich light, heat and water resources, this region is a major grain production base in China, and its potential for agricultural development is very great. However, the amount of water loss and soil erosion in this region is more than half of the total in China. Moreover, due to the unreasonable exploitation of mountainous resources as well as the relative concentration of rain seasons, the ar...