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采用人工模拟降雨溅蚀方法,通过采样制作土壤切片,研究聚丙烯酰胺(PAM)对黄土结皮形成的影响。结果表明,PAM能改善土壤结构状况,显著提高土壤团聚体的稳定性,从而有效地抑制土壤结皮形成;但是随着降雨历时的延长,这种抑制作用逐渐被雨滴破坏;试验筛选出PAM-1抑制土壤结皮形成效果较好。
Artificial rainfall erode method was used to make soil slices by sampling to study the effect of polyacrylamide (PAM) on the formation of loess crusts. The results showed that PAM could improve the soil structure and significantly improve the stability of soil aggregates, thus effectively inhibiting the formation of soil crusts. However, with the prolongation of rainfall, the inhibition was gradually destroyed by raindrops. PAM- 1 inhibition of soil crust formation is better.