选择轻度镉污染农田，旱地种植玉米，水田种植水稻；检测分析土壤的重金属含量以及肥力等理化性质；利用补偿机制，采用生石灰、氧化镁、钙基膨润土进行配方修复被污染土壤，研究其对土壤pH、镉活性以及农产品镉生物富集系数的影响。结果表明，通过配方修复镉污染旱地土壤的pH提升1.59，水田土壤的pH提升0.79；旱地镉活性由42.2%降低到21.8%，水田镉活性由41.47%降低到28.79%。同时发现施加钝化剂后玉米和水稻的镉生物富集系数显著降低，钝化修复后玉米的镉富集系数由13.75%降低到2.64%，水稻的镉生物富集系数由24.38%降低到6.6%。

In a cadmium lightly polluted farmland chosen, corn is planted in dryland and rice is planted in paddy field.The content of heavy metals, fertility and other physical and chemical properties in the soil are tested and analyzed.The soil polluted by cadmium is remediated though the compensation mechanism by using quicklime, magnesium oxide and calcium-based bentonite as formula passivation agents.Influences of passivation agents on soil pH, cadmium activity and cadmium bioconcentration factor of agricultural products are compared and analyzed.Results show that pH values of cadmium contaminated dryland soil and paddy field soil increase by 1.59 units and 0.79 units, respectively after formula remediation.Cadmium activity in dryland soil decreases from 42.2% to 21.8%, and that in paddy field soil decreases from 41.47% to 28.79%.It is also found that after passivation agents have been applied in the soil, cadmium bioconcentration factor of the corn from the dryland reduces from 13.75% to 2.64% and that of the rice from the paddy field declines from 24.38% to 6.6%.

张舵(1992-),男,硕士生,主要研究方向为土壤修复,578205432@qq.com