In order to investigate the quantitative relationship of salt distribution in the soil profile of takyric solonetzs with the quality and quantity of leaching water, and provide scientific basis for the improvement of takyric solonetzs in the Yellow River irrigation district of Ningxia, soil column leaching experiments were carried out in laboratory and the effects of the quality and quantity of leaching water on soil water and salt movement of takyric solonetzs under the application of desulfurization gypsum were studied. The results indicated that under the application of desulfurization gypsum, the cumulative infiltration amount and the depth of wetting front of soil increased rapidly at first and then decreased slowly with increasing infiltration time for takyric solonetzs. With the same leaching water quantity, infiltration duration in different leaching water treatment listed in the following order： the Yellow River water〈ditch water〈farmland drainage water, and Na＋ in the leaching water had a great effect on the infiltration capacity of takyric solonetzs. Compared with the initial value of soil, soil pH values in 0-20 cm soil layer of all treatments decreased in different degree, and soil desalinization ratios were among 79.53% to 90.83%. The desalinization ratio of cation showed Mg2＋〉 Na＋. Compared with the Yellow River water, farmland drainage water led to more obvious reductions in total salt content and the contents of major salt ions such as Na＋ , C1- , Mg2＋ and HCO3- in the 0-40 cm soil layer. The effect of different leaching water on the desalinization ratios of Mg2＋ and HCO3- listed in the following order： the Yellow River water〈ditch water〈farmland drainage water. Since the salinity of farmland drainage water in this study was quite low, salt accumulation phenomenon of subsoil in farmland drainage water treatment was not more obvious than that in the Yellow River water treatment.
Journal of Soil and Water Conservation
soil column leaching experiments
quality and quantity of leaching water
water and salt movement