Effects of Exposed Rock on Soil and Water Loss and Hydrodynamic Characteristics of Karst Slope Land

[Objective] The effects of exposed rocks on the runoff, sediment yield, and hydrodynamic characteristics of slope land needs further study. [Methods] Through the laboratory simulation test, the slope lands with different rock exposure rates (0, 10%, 30%, 50%, 70%) were set, and the artificial simulation rainfall test under different rainfall intensities (30, 60, 90 mm/h) was carried out, in order to explore the impact of rainfall intensity and exposed rocks on runoff, sediment yield and hydrodynamic characteristics of slope land. [Results] The surface runoff and sediment yield of slope land increased with the increased of rainfall intensity, and decreased with the increase of rock exposure rate. Under varying rainfall intensities, the runoff and sediment yield of slopes with 0 and 10% rock exposure rates slope land were not significantly difference in most cases (p>0.05), but the slope with a 0 rock exposure rate was significantly difference from other slopes with rock exposure (p