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树木根系对土壤具有强大的固持作用.这是靠其庞大的根系来实现的.在有树木生长的斜坡上,如果发生土体滑动,那么滑动体在移动时就必然要带动分布于滑动面以下斜坡土体中的树根一起移动.由于在滑动体以下斜坡土体中的树根和土壤紧密相贴,要受力位移,就会与土壤间产生摩擦力,而这种摩擦力的作用方向与土体滑动方向相反,因此是有助于阻止土体滑动的抗滑力.在林地斜坡上正是由于林木根系产生的这个强大的抗滑力(土壤固持力)使土体免于滑动,斜坡得以安定.
Roots of the tree have a strong holding effect on the soil, which is achieved by its large root system.On slopes where trees grow, if the soil slides, the sliding body must be driven to move below the sliding surface The root of the slope soil moves together. Since the root of the soil below the sliding body is closely attached to the soil, it will be subjected to force displacement and will generate friction with the soil, and the action direction of the friction force Which is opposite to the slip direction of the soil so it is a slip resistant force that helps to prevent the slip of the soil.It is due to the strong slip resistance (soil retention) Slope to be stable.