钝化材料对Cd污染农田修复及其后效探究

在田间试验条件下,考察不同钝化材料对农田Cd轻度污染水稻修复效果及稻麦轮作后第二年水稻修复后效。结果表明,在轻度Cd污染农田中,各钝化材料处理均能不同程度降低土壤有效态Cd含量和水稻籽粒中Cd含量。其中,在钝化材料施用当季和稻麦轮作后第二季水稻中修复效果最好的处理为中量纳米材料处理和石灰配施中量纳米材料处理,这两种处理对土壤有效态Cd含量降低率分别为50.94%和47.15%,对水稻籽粒中Cd含量降低率分别为73.74%和69.41%。

Study on Effects and Aftereffects of Passivation Materials on Remediation of Cd Polluted Farmland Soil

Under field trial conditions, the remediation effects of different passivation materials on farmland soil which slightly polluted by Cd, and the aftereffects of rice restoration in the second year after the rice wheat rotation were studied. The results showed that all the passivation materials had different removal effects on available Cd in the farmland soil which slightly polluted by Cd and the content of Cd in rice grain. Of all the materials, mid level nano materials and mid level nano materials with lime had the best remediation effects, the reduction rates of available Cd in the soil were 50.94% and 47.15%, respectively, and the reduction rates of Cd in rice grain were 73.74% and 69.41%, respectively.