聚丙烯酰胺(PAM)对扰动红壤侵蚀产沙过程的影响

Effects of Polyacrylamide(PAM)on Processes of Sediment Yield for Disturbed Red Soil

为了研究聚丙烯酰胺(PAM)对防治扰动红壤水土流失的影响,采用室内人工模拟降雨试验,探讨了不同坡度、雨强与土壤处理下扰动红壤坡面产流与产沙变化过程。试验结果表明,630T型PAM减流效果好于630S型PAM效果,其减流效益在雨强越大的情况下效益越显著;630S型PAM2g/m2减沙效益最显著,平均含沙量比对照减少93.22%～99.65%,侵蚀总量减少93.83%～99.96%;但从经济角度来看,630T型PAM1g/m2最佳,其平均含沙量比对照减少83.59%～99.69%,侵蚀总量减少89.23%～99.78%。

In order to study the effects of applied polyacrylamide（PAM） on preventing soil and water loss for disturbed red soil,the simulated rainfall experiment of different slope,rainfall intensities and soil treatments was designed to investigate the characteristics of runoff and sediment. The results show the effect of reducing runoff for 630T is better than that of 630S,the bigger of rainfall and the more remarkable result of reducing runoff. The result of reducing sediment is most remarkable for 2 g/m2 630S,and its average sediment concentration reduces 93.22%～99.65% than that of control,amount sediment reducing 93.83%～99.96%. But when looking from economy,1 g/m2 630T is the most,and its average sediment concentration reduces 83.59%～99.69% than that of control,amount sediment reducing 89.23%～99.78%.