化学
镉
根际
铁细菌
环境化学
土壤水分
肥料
糙米
生物利用度
水田
硫杆菌
农学
食品科学
细菌
生物
土壤科学
环境科学
有机化学
硫黄
生物信息学
遗传学
作者
Fanyi Kong,Shenggao Lu
标识
DOI:10.1016/j.envpol.2022.119447
摘要
Rice often accumulates higher Cd from contaminated soils, thereby endangering human health. In this study, microbial organic fertilizer (MOF) was applied at the rate of 3, 4.5, and 7.5 t·MOF·ha-1, respectively, to passivate Cd in polluted soils. The goals of the field experiments were to understand how MOF reduces the uptake of Cd in rice by affecting the mobility and bioavailability of Cd in the rhizosphere soil. BCR sequential extraction analysis recorded that the addition of MOF decreased the content of available Cd and increased Cd residual fraction in soils. Compared with the control treatment, the application of 7.5 t·MOF·ha-1 significantly increased the yield of rice by 7.9% and decreased the Cd content in brown rice by 86.4%. The application of MOF strengthened the oxidation of iron by increasing the relative abundance of Fe-oxidizing bacteria (FeOB) Thiobacillus, and further increased the ratio of amorphous/dissociative iron oxides (Feo/Fed) and thickened the iron plaques on the root surface of rice. The spatial distribution of Cd and Fe on rice root indicated the key role of iron plaques in preventing Cd from entering rice. The structural equation model confirmed that MOF application regulated iron oxides by FeOB, dehydrogenase activity, and catalase activity, thereby reducing the Cd uptake of rice.
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