中文摘要：

通过野外模拟降雨试验,研究了施用SP对黄土坡面产流、产沙的影响,并对实验数据进行数学模拟,建立了SP施用量与产流、产沙强度间的关系模型。结果表明：SP施用量与产流时间、平均产流强度呈二次函数相关关系,与产沙强度呈线性负相关关系。SP用量在0-2.42 g/m^2之间时,能够延缓坡面产流,用量为1.21 g/m^2时延缓产流效果最明显;用量介于0-3.31 g/m^2之间时,能够增加土壤入渗,减少坡面产流量,用量1.65 g/m^2的增渗减流效果最佳;施用SP后,能够减少坡面输沙强度,且用量越大,减沙效果越明显。SP可影响坡面产流过程,用量1.8 g/m^2时,能够减小产流初期径流强度增幅,用量为3.6 g/m^2时,其产流过程线与对照极接近,而施用量增加到5.4 g/m^2时,产流强度明显增大。SP对坡面产沙过程的影响表现为：随施用量增大,产沙强度峰值呈逐步减小的变化趋势。

英文摘要：

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 pro- ducing 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/m^2, especially 1.21 g/m^2, 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/m^2, especially 1.65 g/m^2. SP can affect the surface runoff process. While the amount was 1.8 g/m^2, the increase of the initial run,off was reduced in the dosage of 3.6 g/m^2. And, the runoff process line was very close to the control, while the application rate increased to 5.4 g/m^2, the intensity of runoff increased significantly. With the application rate increasing, the sediment yield intensity was gradually reduced.