泥质滨海盐渍土快速脱盐改良剂的筛选研究

发布时间：2018-04-01 02:31

本文选题：生物质炭　切入点：滨海盐渍土　出处：《浙江农林大学》2015年硕士论文

【摘要】：我国滨海盐渍土分布广、面积大,是沿海地区重要的土地资源。本研究通过添加不同改良剂的室内土柱淋洗试验,分析土壤淋洗前后土壤pH和电导率及淋溶液钠离子变化规律,并进一步筛选改良效果最佳的改良剂组合,为实现新垦泥质滨海盐渍土快速脱盐提供参考依据。主要研究结论如下:(1)通过对改良剂的重金属含量检测分析结果表明,本试验所使用的改良剂其重金属含量均低于相关国家标准含量值,所使用的改良剂添加到土壤中不会对土壤造成二次污染,满足环境安全性要求。(2)对淋出液钠离子研究结果表明,淋出液中钠离子含量均显著高于对照,添加0.5%脱硫石膏和1.5%生物质炭混合物处理组在60d左右迁移出的钠离子含量最高,且其脱钠总量达到对照组的1.3倍以上。(3)通过对淋溶试验前后土壤pH值和电导率的对比分析可知,不同改良剂能显著降低土壤pH值和电导率,说明添加改良剂可以达到改良盐渍土的目的;其中以添加脱硫石膏加生物质炭处理效果最显著。综上所述,选用脱硫石膏加生物质炭组合的改良剂能够加快泥质滨海盐渍土脱盐过程,从而达到滨海盐渍土资源的合理改良利用。
[Abstract]:Coastal saline soil is an important land resource in coastal areas because of its wide distribution and large area.In this study, the changes of soil pH, conductivity and sodium ions in leaching solution before and after soil leaching were analyzed through the indoor soil-column leaching experiment with different modifiers, and the best modifier combinations were selected.It provides a reference for rapid desalination of newly reclaimed muddy coastal saline soil.The main conclusions are as follows: (1) through the analysis of heavy metal content of the modifier, the results show that the heavy metal content of the modifier used in this experiment is lower than that of the relevant national standard.The results showed that the content of sodium ion in the leaching solution was significantly higher than that in the control solution, and the content of sodium ion in the leachate was significantly higher than that in the control, and the content of sodium ion in the leachate was significantly higher than that in the control, and the content of sodium ion in the leaching solution was higher than that in the control.Addition of 0.5% desulphurization gypsum and 1.5% biomass carbon mixture treatment had the highest sodium content in 60 days, and the total amount of sodium removal was 1.3 times of that of the control group.) the comparison and analysis of soil pH and electrical conductivity before and after leaching test showed that the content of sodium ion was the highest in the treatment group.Different modifiers can significantly reduce the pH value and electrical conductivity of the soil, indicating that the addition of the modifier can achieve the purpose of improving the salinized soil, among which the desulfurization gypsum plus biomass carbon treatment is the most effective.To sum up, the process of desalination of muddy coastal saline soil can be accelerated by using the modifier of desulphurization gypsum and biomass carbon, and the reasonable improvement and utilization of coastal saline soil resources can be achieved.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S156.4

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