ABSTRACT
The protection from roots to slope includes the reinforcing effect of shallow roots and the anchorage effect of deep roots (Jiang Z.Q., 2007; Zhou D.P., & Zhang J.Y., 2005). However, the information about the effect of slope protection with roots is very limited under a condition of slope, especially rocky slope (Sun H.L., Li S.C., Xiong W.L., et al. 2008). The soil conservation effect of roots can be represented by pull-out resistance, and it has a significant correlation with the
1 INTRODUCTION
In the late 90 s, the technology of ecological restoration for slope vegetation was introduced into our country. During the process of ecological restoration for slope vegetation, the site conditions influence both the growth of plants and the soil-reinforcement of roots, such as the aspect and gradient of slope (Pei J., Ai Y.W., Liu H., et al. 2009; Xue W.P., Zhao Z., Li P., et al. 2003). Some studies indicated that as for the same species of shrubs which have similar height of plants or stems, when the weathered degree of bedrocks increased, the depth dig by roots into the rock increased, the amount of roots declined and the pull-out resistance of roots were increased (Li S.C., Sun H.L., Yang Z.R., et al. 2006).
