紫花苜蓿-菌根真菌-根瘤菌对多氯联苯污染土壤的修复作用

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

以紫花苜蓿为材料,运用盆载试验,通过接种根瘤菌、菌根真菌对多氯联苯污染土壤的修复效应进行了研究。结果表明,紫花苜蓿对土壤中多氯联苯浓度降低具有重要作用,重污染土壤中平均降低了24.48%,轻污染土壤平均降低了19.14%;根瘤菌和菌根真菌双接种强化了紫花苜蓿对多氯联苯的修复作用,污染土壤的修复效果与土壤原污染程度有关;紫花苜蓿-菌根真菌-根瘤菌协同修复效果在重污染土壤中强于轻污染土壤;同时紫花苜蓿对土壤中PCBs表现出较强的耐性,因而可以作为PCBs污染土壤的植物修复材料。

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.