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为了更有效地使用石膏改良苏打化-硫酸盐氯化物轻度盐化草甸碱土,结合田间持水量、碱化度、碱性盐的含量,考虑最佳灌水量、石膏转化率、石膏与土的处理方式、改良深度等因素,设计了27种处理方式。对所得滤液的离子进行分析后换算成盐分。将滤液中的可溶盐与改良前的盐分相比,运用推理计算方法求得石膏改良碱土的不同效果。结果表明:1随着灌水量的增加,石膏的溶解量、转化量都有所增加,碱化度也相应地降低。但是这种线性关系达到一定程度后,相关关系将会逐渐变得不明显。因而,对各种处理要控制不同的水量,达到合理利用。2高温比低温时,石膏的溶解量增加1.47~1.50倍,交换性钠的脱出量高出2.98~4.7倍,交换性镁的脱出量高出2.07~2.9倍,大体上说明了夏季的改良效果更好。但夏季各处理也存在2个缺点造成石膏的无益损失,一是发生了大量的渗漏损失,二是在代换交换性钠的同时也代换出大量的交换性镁。3上部20 cm部分混匀这一处理,经过与其他两者的对比,是石膏改良碱化土壤的最优处理方案能够达到自上而下逐步脱碱。而且石膏与浅层土壤混匀在生产上比较切实可行。
In order to more effectively use gypsum to improve soda-sulphate chloride mild salinization meadow alkaline soil, combined with field capacity, alkalinity, alkaline salt content, consider the best irrigation amount, gypsum conversion, gypsum and soil Of the way to deal with the depth of improvement and other factors, designed 27 kinds of treatment. The resulting filtrate ion was analyzed and converted into salt. The soluble salt in the filtrate compared with the salt before the improvement, the use of inference calculation method to obtain different effects of gypsum improved alkaline earth. The results showed that: 1 with the increase of irrigation, gypsum dissolved amount, the amount of conversion has increased, the degree of alkalinity also decreased accordingly. However, this linear relationship will reach a certain level, the correlation will gradually become less obvious. Therefore, a variety of treatments to control different amounts of water to achieve rational use. 2 High temperature to low temperature, gypsum dissolution increased by 1.47 to 1.50 times, exchangeable sodium prolapse 2.98 to 4.7 times higher, exchangeable magnesium prolapse higher than 2.07 to 2.9 times, largely illustrates the improvement in summer better. However, there are two shortcomings in the treatment of summer, resulting in the useless gypsum loss, one is the occurrence of a large number of leakage losses, the second is the replacement of exchangeable sodium also replaced a large amount of exchangeable magnesium. 3 The top 20 cm part of the mix, after the treatment, after comparing with the other two is gypsum to improve the optimal treatment of alkalized soil to achieve top-down gradually alkaline. And gypsum and shallow soil mixing in production more feasible.