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针对间歇入渗条件下土壤溶质运动规律研究的不足,采用室内土柱试验的方法,研究了相同灌水总量、不同灌水频次条件下的水分和溶质运动规律。试验结果表明:在无蒸发的条件下,间歇入渗会显著提高入渗和排水的速率,但不会影响到排水总量;在一定灌水频次范围内,间歇入渗会在不影响溶质淋洗效率的条件下提高溶质淋出的速率,但过多的灌水频次会导致土壤中水分运动速率过快,不能有效地携溶质向下层土壤迁移,导致溶质淋洗效率降低。该研究结果可为制定合理的间歇灌水制度提供一些依据和参考。
Aiming at the deficiency of the study on the law of soil solute movement under the condition of intermittent infiltration, indoor soil column test was used to study the law of water and solute movement under the same irrigation total and different irrigation frequency. The experimental results show that under the condition of no evaporation, intermittent infiltration can significantly increase the rate of infiltration and drainage, but will not affect the total amount of drainage; within a certain irrigation frequency range, intermittent infiltration will not affect the solute rinse However, excessive frequency of irrigation will lead to excessive water movement in the soil, which can not effectively transport the solute to the soil in the lower layer, resulting in a decrease in the leaching efficiency of the solute. The results of this study can provide some basis and reference for formulating a reasonable intermittent irrigation system.