长江上游龙川江流域典型片区植被侵蚀控制作用及其水土保持意义

Effect of Vegetation on the Erosion Control and its Significance in the Soil Conservation in Typical Areas in Longchuanjiang Watershed at Upper-Stream of the Yangtze River

龙川江流域典型片区植被侵蚀控制的综合作用模式的概念模型表明 ,植被通过其从坡面到根际土层的若干影响环节实施侵蚀控制 .研究发现 ,这些作用具有较为突出的量值和潜能 .从荒山荒坡完全恢复植被、陡坡耕地退耕还林 (草 )后可能减少的水土流失量和现有植被如果遭到彻底破坏可能增加的水土流失量三个方面 ,水土流失动态监测系统 (SEDMS)计算表明 。

The concept model, which demonstrates the comprehensive effect of vegetation on erosion control in the Longchanjiang Watershed, indicates that the vegetation has a great influence on the soil surface and the rooted soil mass. The role of the vegetation is significant in the surface erosion control in situ. Calculation by SEDMS shows that the vegetation concerned is also provided with striking significance in the regional scale, which can be illustrated by some theoretical analysis, such as a great decrease of soil erosion after bare land is vegetated.