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采用实验室土柱法,在3种pH(4.0,5.5,7.5)淹灌和降雨条件下,研究了非饱和土壤中氟离子的迁移转化。结果表明:不同pH降雨、淹灌条件下,随着淋洗时间的增加,淋滤液中的可溶性氟含量逐渐增大,特别是pH5.5和pH7.5淋滤液中氟的变化规律明显。淹灌条件下淋滤液中氟含量低于降雨条件下淋滤液的氟含量。淋溶前后土壤表层的氟含量变化明显,淋滤后表层土壤表现为淋溶状态。土壤pH值是影响土壤氟存在形态的重要因素之一,对土壤可溶性氟有着重要的影响。
Under the condition of three kinds of pH (4.0, 5.5, 7.5) flooding and rainfall, the lab soil column method was used to study the migration and transformation of fluoride in unsaturated soil. The results showed that the soluble fluorine content in the leachate gradually increased with the increase of leaching time under different pH conditions of rainfall and flooding, especially the changes of fluoride in leaching solution at pH5.5 and pH7.5. Under flooded irrigation, the content of fluoride in the leachate was lower than that of the leachate under rainfall. The content of fluorine in soil surface before and after leaching changed obviously, and the surface soil leached after leaching. Soil pH is one of the important factors that affect the existence of soil fluorine, and has an important effect on soil soluble fluorine.