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通过对秸秆不同覆盖方式的土柱模拟实验研究表明,秸秆深层覆盖在土壤中形成了一个毛细管障碍层,破坏了土壤毛细管的连续性,明显降低深层土壤水分蒸发,减少了深层土壤盐分向表层的运移;秸秆表层覆盖使土表与空气的接触面变小,利于土壤保水。深层秸秆结合表层秸秆覆盖对土壤的保水效果最好,而且抑制盐分的土壤表聚,减轻土壤盐分对作物生长的胁迫,降低土壤耕层的返盐,保证了作物正常生长。
Through the soil column simulation experiment with different covering ways of straw, it shows that the deep layer of straw forms a capillary barrier layer in the soil, which destroys the continuity of the capillary of soil, significantly reduces the evaporation of deep soil moisture and reduces the deep soil salinity to the surface Transport; straw surface covering so that the contact surface of the soil surface and air becomes smaller, which will help soil water retention. Deep straw combined with surface straw mulch has the best water retention effect on the soil, but also inhibits the aggregation of soil with salinity, reduces the salt stress on crop growth, and reduces the salt return of soil plow, thus ensuring the normal growth of the crop.