Research on the Establishment of Experimental Equations for Grassland Water and Sediment Yield and Their Relationships

Effective characterization of water and their relationship is the current focus and difficulty of grassland soil and water loss research. This investigation utilized simulated rainfall to conduct experiments. The findings revealed the following: ① The sediment yield of grassland under different slopes decreases linearly with the increase in water yield. The sediment yield of grassland under different rainfall intensities increases linearly with the increase in water yield. The decrease is more obvious between 30% and 40%, and 60% and 70%, coverage. ② This phenomenon may be attributed to the stronger correlation between plant biomass and sediment yield compared to that between plant biomass and water yield. The efficacy of vegetation coverage in characterizing grassland sediment yield surpasses its ability to depict water yield. ③ The variability of is more obvious than that of, and the relationship between and has cyclical characteristics. ④ This study uses volume and root dry weight to establish an empirical equation for the relationship between sediment yield and water yield. Later studies should supplement field experiments and determine the main controlling factors and the conduction paths between factors. The research will provide technical guidance for grassland water and soil resource management and soil erosion model optimization.