2.3. Date measurement and calculation
In this study, the total runoff within the prescribed time was the amount of runoff collected at each time period. The collecting sediment was dried in a oven at 105°C for at least 24 h until constant weight, and then dry weight determined. Sediment concentration was obtained by dividing sediment yield by the discharge of water. Sediment particle size was analyzed by a MS2000 Laser Size Classifier (Malvern, UK).
To assess the interaction between slope gradient and vegetation cover on runoff and sediment yield, we revised the approach of Cheng et al. (2007) and Ma et al. (2013) as follows: