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以种植年限3年的盐渍化土壤为研究对象,采用模拟土柱淋溶法,研究了不同用量和配比的KCl和MgCl_2营养液对土壤盐渍化离子的影响,以期为盐渍化土壤的修复提供参考依据。结果表明:随着营养液施用量的增加,土壤中K~+、Mg~(2+)、Cl~-含量提高,Na+、Ca~(2+)、HCO_3~-的含量降低,土壤中总盐分增高。与原土壤相比,土壤中K~+、Na~+、Ca~(2+)、Mg~(2+)、Cl~-和土壤盐分总量下降,HCO_3-和SO_4~(2-)较原土壤有所提高。从土壤盐分离子总电荷变化来看,在1:1型的营养液配方中各处理间差异较小,而在2:1型营养液配方中,随施钾用量的增加使土壤阳离子的存留量降低。表明次生盐渍化土壤中,平衡及低浓度的施用量可缓解土壤盐渍化,降低养分的淋溶作用,促进离子间平衡,而过量施肥会加速阴阳离子的不均衡。
Taking salinized soils with planting years of 3 years as the research object, simulated soil column leaching method was used to study the effect of KCl and MgCl 2 nutrient solution on soil salinization ions in the order of salinization soil Provide a reference for the repair. The results showed that the contents of K +, Mg2 + and Cl ~ - in the soil increased with the increase of the nutrient solution, while the content of Na +, Ca2 + and HCO3 + Salt increased. Compared with the original soil, the total K +, Na +, Ca ~ (2 +), Mg ~ (2 +), Cl ~ - and soil salinity decreased while the contents of HCO_3 ~ and SO_4 ~ (2-) The original soil has been increased. From the change of the total charge of soil salt ions, there is little difference among the treatments in the 1: 1 nutrient solution formula, but in the formula of 2: 1 nutrient solution, with the increase of potassium application amount, the amount of soil cation reduce. The results showed that balanced and low concentration of secondary salinized soil could alleviate soil salinization, reduce the leaching of nutrients and promote the balance of ions. Excessive fertilization would accelerate the imbalance of anion and cation.