闽北地区是福建省浅层滑坡灾害的多发区之一，该区残坡积土体厚度大、土层结构松散，地表人为活动强烈 , 暴雨后不同强度的降雨入渗是诱发该区出现不同规模滑坡的主要因素。从滑坡防治的角度出发，采用双环入渗法对不同植被类型下滑坡体表层土的入渗性能进行了研究，用 Horton 水分入渗模型对入渗过程进行了模拟，并分析了植物改变土壤水分入渗率的作用机理。研究结果表明：植被覆盖能增强滑坡体表层土体的入渗能力；竹林的入渗能力大于杉树林；草本植物能有效降低土壤的水分入渗率。滑体表层土体的入渗率过高，而下层入渗率又较低时，会造成上层土体产生积水 , 从而诱发滑坡发生。

Northern Fujian Province is a shallow landslide disaster area, where exists thick residual colluvium, loose soil structure and strong man-made surface activities, the main factors of inducing different scale landslides are different intensities of rainfall infiltration after a heavy rainstorm. From the view of landslide prevention, this paper uses double-loop infiltration method to research the effect of different vegetation types on surface soil infiltration, analyzes the mechanism of vegetation changing the soil infiltration rate, and simulates the process of infiltration using Horton model. The results show that vegetation will increase soil infiltration capacity, the infiltration capacity of bamboos is stronger than cedar forest, herbaceous plants can effectively reduce the rate of soil infiltration. It will result in the upper soil storing water and induce landslide if the infiltration of landslide surface soil is too high while the soil infiltration in lower stratum is low rate.