植被对斜坡稳定性的积极作用和局限性

摘要

Plant root-complex, formed in the surface soil, can achieve the purpose of maintaining the slope stability through enhancing the shear strength of slope soil. While the root zones of most plants distribute generally within 1 meter soil layer and the critical slip surface passes below the rooting zone, the root-complex has minimal effect in slope stability. Besides, the shear strength of slope developed by vegetation may be weaker than that of uncovering slope under the same rainfall condition, this suggests that the vegetated slope protection has limitations. However, vegetated slope have macrospore flow paths with preferential flow effect, which will have certain effect on landslide inoculation.%植物根系在表土层形成了根-复合体，能够增强斜坡土体的抗剪强度，从而起到维持边坡稳定的作用。但根系主要分布在1米土层范围内，大部分植被根系并不能延伸到潜在滑动面以下，对维持斜坡稳定性的积极贡献是有限的。且在同等降雨条件下，植被发育斜坡的抗剪强度可能比裸坡的小，这说明植被护坡具有局限性。植被发育斜坡有更加丰富的优先流通道---大孔隙，它对滑坡孕育有一定的作用。