电动模拟土壤酸化及其交换性离子组成变化

发布时间：2018-04-29 21:32

本文选题：土壤酸化 + 交换性离子　；参考：《土壤通报》2017年03期

【摘要】：土壤酸化及其环境效应研究是土壤环境领域的重要内容。自行设计了模拟土壤酸化的电动装置,该装置由直流电源、反应槽、石墨电极组成,并采用四种不同类型土壤,研究了电动模拟土壤酸化后土壤pH、交换性酸和交换性阳离子组成的变化。实验结果显示,经电动处理后土壤pH发生明显变化,土壤pH由阳极到阴极逐渐升高,pH变幅为水稻土燥红土红壤赤红壤,水稻土的pH变化比红壤更为明显;土壤交换性H+和Al~(3+)含量在阳极附近最高,交换性Al~(3+)占交换性酸总量达65%以上;交换性Ca~(2+)、Mg~(2+)、K~+和Na~+表现出离阳极越远,含量越大的规律,其中交换性Ca~(2+)和Mg~(2+)在模拟酸化后含量变化较大,而交换性K~+和Na~+的变化幅度相对较小。结果表明,电动处理可快速获得不同pH梯度的土壤样品,并模拟了土壤酸化过程中的阳离子迁移过程,是模拟土壤酸化及其效应研究的有效方法。
[Abstract]:Soil acidification and its environmental effects are important contents in the field of soil environment. An electric device was designed to simulate soil acidification. The device consists of DC power supply, reaction tank, graphite electrode and four different types of soil. The changes of soil pH, exchangeable acid and exchangeable cation composition were studied after electrokinetic simulation of soil acidification. The results showed that the soil pH changed obviously after electrokinetic treatment. The pH value of soil increased gradually from anode to cathode, and the change of pH value of paddy soil was more obvious than that of red soil, and the change of pH value of paddy soil was more obvious than that of red soil. The content of exchangeable H and Al~(3 in soil is the highest near the anode, and the exchangeable Al~(3) accounts for more than 65% of the total exchangeable acid. The contents of exchangeable Ca~(2 and Mg~(2) changed greatly after simulated acidification, but the change of exchangeable K ~ and Na ~ ~ were relatively small. The results show that the electrokinetic treatment can quickly obtain soil samples with different pH gradients and simulate the cationic migration process in the process of soil acidification. It is an effective method to simulate soil acidification and its effects.
【作者单位】：浙江大学环境与资源学院;
【基金】：国家重点研发计划(2016YFD0200302)资助
【分类号】：S153

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