In other words, the mean detachment rate of rooted soil samples was only one-fourth that of this result corroborates recent experiments on rooted soils, which indicated that soil detachment rates decreased as root density increased (Mamo and Bubenzer, 2001 2001b; Gyssels and Poesen, 2003; De Baets et al., 2006. De Baets and Poesen, 2010). Similar to the results of De Baets et al. (2006), the decline in detachment rate mostly occurred in the root density range of 0 to 4 kg m As shown in table 2, the mean detachment rate of the rooted soil samples was only one-third that of the control when root density was less than 4 kg m s. When root density varied from 4 to 10 kg m s the detachment rate declined continuously but at a low rate. When root density was greater than 10 kg m 3, the detachment rate was almost stable, with a mean value of 0.058 kg m s The decrease in detachment rate with root density seemed to be independent of the applied shear stress within the tested range of 4.79 to 23.38 Pa in this study For concentrated flow erosion, detachment rate could be defined as (Foster, 1982):