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为探索滴灌条件下秸秆覆盖对棉田土壤水盐运动的影响,设置表层覆盖、地表下30cm覆盖和无覆盖3种处理,进行对比试验研究,结果表明,秸秆覆盖通过对土壤水分的影响间接影响了土壤盐分的运移和分布。在30cm处覆盖秸秆主要对30cm以上土壤的水分和盐分产生影响,对35cm以下的影响和表层覆盖比较接近。采用秸秆覆盖对土壤水分和盐分水平方向的运移具有一定影响,无覆盖在前期、中期和后期土壤表层盐分均最高。30cm处覆盖秸秆阻碍了35cm以下土壤毛管水的上升,从而阻止了盐分的上升。采用秸秆覆盖后,特别是在30cm深度采用秸秆覆盖,对于调控土壤水、盐变化,抑制土壤盐分上移具有积极作用。
In order to explore the effect of straw mulching on the movement of soil water and salt under drip irrigation, the surface coverage, surface 30 cm coverage and no coverage were set up to conduct comparative experiments. The results showed that straw mulching indirectly affected the soil moisture Soil salt movement and distribution. Covering the straw at 30cm mainly affects the soil moisture and salinity above 30cm, and the effect below 35cm is close to the surface covering. Straw mulching had a certain influence on soil moisture and horizontal movement of salinity. The coverage of soil salinity in the early, middle and late stages was the highest without covering. Covering the straw at 30 cm hindered the rise of capillary water in the soil below 35 cm, thus preventing the salt from rising. Straw covering, especially in the depth of 30cm with straw mulching, for the regulation of soil water, salt changes, inhibition of soil salinity uplift has a positive effect.