| The effect of Sodium Polyacrylate (SP) on the runoff and sediment yield was studied by the field simulated rainfall experiment.For the SP application amount, runoff and sediment yield intensity, the relationship model was built.The results showed that, there was a quadratic relationship between the SP application amounts, the time of producing runoff and the average intensity of runoff yield, respectively.But a straight-line relationship with the sediment yield intensity was found.When the SP application amount is 0 to 2.42 g/m2, especially 1.21 g/m2, SP delayed the runoff yield on slope.Therefore, SP increased the soil infiltration and decreased the runoff yield, as the application amount is 0 to 3.31 g/m2, especially 1.65 g/m2.SP can affect the surface runoff process.While the amount was 1.8 g/m2, the increase of the initial run-off was reduced in the dosage of 3.6 g/m2.And, the runoff process line was very close to the control, while the application rate increased to 5.4 g/m2, the intensity of runoff increased significantly.With the application rate increasing, the sediment yield intensity was gradually reduced. |