Bioremediation of Polychlorinated Biphenyls Contaminated Soil by Medicago sativa L. Inoculated with Glomus caledoniun L. and Sinorhizobium meliloti

Inoculated Glomus caledoniun L. and Sinorhizobium meliloti, Medicago sativa L. was used to study the bioremediation of polychlorinated biphenyls (PCBs) in soil by cultivating it in a pot. The results showed that Medicago sativa L. played an important role in reducing the content of PCBs in soil, and the content of PCBs in heavily contaminated soil and weakly contaminated soil were reduced by 24.48% and 19.14% respectively. The bioremediation effect of Medicago sativa L. was intensified when inoculated with Glomus caledoniun L. and Sinorhizobium meliloti. The bioremediation of PCBs in soil was related with the original content of PCBs in soil. The co-bioremediation of Medicago sativa L.-Glomus caledoniun L.-Sinorhizobium meliloti in heavily contaminated soil was better than that in light contaminated soil, and PCBs contents were reduced by 26.27% and 23.81% respectively. Medicago sativa L. showed a higher endurance to PCBs in soil, so it could be used in the bioremediation of contaminated soil with PCBs.