耕作方式对表层土壤饱和导水率及紧实度的影响

Effects of different tillage methods on saturated hydraulic conductivity and compactiveness of the surface soil

通过模拟降雨对定西苜蓿-春小麦轮作土壤的饱和导水率和土壤紧实度进行了研究,试验结果表明:苜蓿不翻耕处理(T2)的土壤容重为1.35,显著高于苜蓿-春小麦轮作翻耕处理(T3)的土壤容重1.08;降雨前,各处理间表层土壤饱和导水率差异不显著,但以苜蓿不翻耕处理(T2)的最高,为92.6mm/h;降雨后,苜蓿不翻耕处理(T2)的饱和导水率为55.07mm/h,比苜蓿-春小麦轮作翻耕(T3)处理的几乎高2倍;随着土壤深度的增加,各处理的土壤紧实度逐渐增加,苜蓿地表层土壤的紧实度高于耕地。

The saturated hydraulic conductivity and compactiveness of the surface soil under Lucerne-spring wheat rotation in Dingxi were studied with the aid of rainfall simulation. The results showed that soil bulk density of Lucerne field without plowing (T2) was 1.35, significantly higher than that of Lucerne-spring rotation field under plowing (T3) 1.08 soil; soil saturated hydraulic conductivity under different treatments had no significant difference before rainfall, but that of Lucerne field without plowing (T2)was the maxmium, as 92.6mm/h; soil saturated hydraulic conductivity of Lucerne field without plowing (T2) was 55.07 mm/h, as the three times of that of Lucerne-spring wheat rotation field under plowing (T3) after simulated rainfall; soil compactiveness of all treatments increased gradually with increasing soil depth , and the compactiveness of surface soil in Lucerne field was higher than that of the plowed field.