不同淋洗模式下干旱区盐渍土改良效果分析

发布时间：2018-05-17 10:59

本文选题：电导率 + 含盐量　；参考：《水土保持学报》2017年02期

【摘要】：通过开展室外土柱模拟淋洗试验,选择间歇淋洗与连续淋洗两种淋洗模式,分析不同灌水总量和不同灌水频次相互组合条件下盐渍土的改良效果。结果表明:(1)灌水量相同情况下,间歇淋洗滤出液的电导率高于连续淋洗,间歇淋洗的淋洗效果好于连续淋洗;(2)灌水量不同条件下,滤出液体积随灌水量的增加而增多,灌水量越大盐分淋洗效果越好;(3)淋洗结束后,土壤pH值较淋洗前均有下降,与土壤盐分有相同的变化趋势;灌水量越大,脱碱效果越好。在本试验条件下,盐分淋洗效果以15L分3次给水的间歇淋洗方式最优,淋洗效率为11.58g/L,土壤pH值均由8.42下降到8.07。可供制定维持农田水盐平衡的节水灌溉制度以及盐碱地改良参考。
[Abstract]:Through the simulated leaching experiment of outdoor soil column, two leaching modes, intermittent leaching and continuous leaching, were selected to analyze the improvement effect of salinized soil under the conditions of different irrigation total amount and different irrigation frequency. The results showed that under the same irrigation amount, the electrical conductivity of the intermittent leaching fluid was higher than that of continuous leaching, and the leaching effect of intermittent leaching was better than that of continuous leaching. The higher the amount of irrigation, the better the effect of salt leaching.) after the leaching, the pH value of the soil decreased, which was the same trend as that of the soil salt, and the higher the amount of irrigation, the better the effect of desalination. Under the condition of this experiment, the salt leaching effect was the best in the form of 15L water supply, the elution efficiency was 11.58g / L, and the pH value of soil decreased from 8.42 to 8.07g / L. It can be used as a reference for water-saving irrigation and salt-alkali land improvement to maintain water and salt balance in farmland.
【作者单位】：中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室;中国科学院阜康荒漠生态系统国家站;中国科学院大学;
【基金】：国土资源部公益行业科研专项(201511047-2) 青年基金项目(31400394)
【分类号】：S156.41

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