植被对南方红壤丘陵区土壤侵蚀的影响研究

Study on the Impact of Vegetation to the Soil Erosion in the Red Soil Hilly Area of South China

本文以南方红壤区为研究对象,以传统径流小区观测为主要手段,共布设8个径流小区,每个径流小区设置不同的植被类型和植被盖度。本试验观测了36场次降雨条件下降雨量、径流量和泥沙量资料,分析了植被类型和植被盖度对减流减沙的作用规律,结果表明:①在减流作用中,乔灌木林>混交林>纯林;②林分结构越复杂,减沙效果越显著;③植被类型对减流减沙具有整体效果,而植被盖度更突出在影响其变化幅度上。

Totally there were 8 run - off plots laid with different vegetation types and coverage for observation of the soil erosion in the red soil area of South China. The essay analyzed the effect rules of vegetation types and coverage on the reduction of run - off and sand through the observation to the precipitation, runoff and sediment amount through 36 times of rain conditions. The results show that ： 1 ） the effect trend of run - off reduction appears that trees and shrubs 〉 mixed forest 〉 pure forest; 2） the stand structure is more complex, the sand reduction effect is more obvious; 3） vegetation types own the whole effect to the reduction of run - off and sand, while the vegetation coverage enjoys the more effect on the range of variation.