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: