Freezing saline water irrigation (FSWI) in winter has been shown to be an effective way to reclaim heavy saline soils. In this four-year experiment, the salt leaching process during saline ice melting and infiltration after FSWI was investigated. Saline water was frozen in saline ice on top of soil after irrigation. Over 70 or 80 days of ice melting and infiltration, ice and soil samples were taken at 10-day intervals to quantify the soil salt leaching process. The results showed that salt leaching mainly occurred in the initial 30 days after irrigation (DAI); approximately 72% of the total salt reduction was the result of salt migrating out of the 0 to 20 cm soil layer. Furthermore, in this period, the amount of salt that leached out of the 0 to 20 cm soil layer with meltwater was greater than the total salt from the irrigation water. Approximately 15% of the total salt reduction in the 0 to 20 cm layer occurred from 60 to 80 DAI; in this period, the infiltrating meltwater accounted for more than 30% of the total irrigation water, and the electrical conductivity of the meltwater was below 4.5 dS m−1. After the meltwater had infiltrated the soil completely, the electrical conductivity of saturation paste (ECe) in the 0 to 20 cm layer for FSWI was below 4.3 dS m−1, significantly lower than the ECe of 16.7 dS m−1 of the nontreated soil. These results indicated the soil salt leaching was mainly determined by the melting process of saline ice under the FSWI treatment.

中文翻译：

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野外条件下融化盐冰渗入滨海盐渍土的盐浸过程

冬季冷冻盐水灌溉 (FSWI) 已被证明是一种有效的回收重盐渍土壤的方法。在这个为期四年的实验中，研究了 FSWI 后盐冰融化和渗透过程中的盐浸出过程。灌溉后盐水被冻结在土壤顶部的盐冰中。超过 70 或 80 天的冰融化和渗透，每隔 10 天采集一次冰和土壤样品，以量化土壤盐分浸出过程。结果表明，盐浸主要发生在灌溉后的最初30天（DAI）；大约 72% 的总盐分减少是盐分迁移出 0 至 20 厘米土层的结果。此外，在此期间，融水从 0 至 20 cm 土层中浸出的盐分大于灌溉水中的总盐分。0 到 20 cm 层中总盐分减少的大约 15% 发生在 60 到 80 DAI；在此期间，入渗融水占灌溉水总量的 30% 以上，融水电导率低于 4.5 dS m-1。融水完全渗入土壤后，FSWI 0~20 cm 层饱和膏（ECe）的电导率低于4.3 dS m-1，明显低于未处理土壤的ECe 16.7 dS m-1 . 这些结果表明土壤盐分淋失主要是由FSWI处理下盐冰的融化过程决定的。并且融水的电导率低于 4.5 dS m-1。融水完全渗入土壤后，FSWI 0~20 cm 层饱和膏（ECe）的电导率低于4.3 dS m-1，明显低于未处理土壤的ECe 16.7 dS m-1 . 这些结果表明土壤盐分淋失主要是由FSWI处理下盐冰的融化过程决定的。并且融水的电导率低于 4.5 dS m-1。融水完全渗入土壤后，FSWI 0~20 cm 层饱和膏（ECe）的电导率低于4.3 dS m-1，明显低于未处理土壤的ECe 16.7 dS m-1 . 这些结果表明土壤盐分淋失主要是由FSWI处理下盐冰的融化过程决定的。