多氯联苯污染土壤的紫云英–根瘤菌联合修复效应

选用紫云英(Astragalus sinicus L.)作为宿主植物,通过盆栽试验研究了接种紫云英根瘤菌(Rhizobium huakuii)对多氯联苯污染土壤的修复效应。结果表明,经过100天的修复作用后,单接种根瘤菌、种植紫云英以及紫云英接种根瘤菌处理土壤中多氯联苯的去除率分别为20.5%、23.0%、53.1%,均显著高于对照处理(P<0.01)。而且发现接种根瘤菌显著增加了紫云英根际土壤的微生物生物量碳、氮,明显增强了土壤微生物群落的碳源利用能力,从而改善了微生物群落功能多样性。可见,紫云英–根瘤菌共生体对多氯联苯污染土壤表现出较好的修复潜力。

Combined Remediation Effects of Astragalus sinicus L. Inoculated with Rhizobium huakuii on PCBs Contaminated Soils

The combined remediation effects of host plant (Astragalus sinicus L.) inoculated with rhizobium Rhizobium huakuii on PCBs contaminated soils was studied using pot experiments. The results showed that soil PCBs concentrations of single incubation of Rhizobium huakuii (R) and single planting Astragalus sinicus L. (P) decreased by 20.5% and 23.0%, respectively. Astragalus sinicus L. with incubation of Rhizobium huakuii had a clear role in PCBs removal in soils, PCBs concentration in polluted soils decreased by 53.1%, all of which were significantly higher than the untreated soils (P<0.01). We also observed that soil microbial communities in Astragalus sinicus L. rhizosphere soils had a higher microbial biomass C and N and carbon utilization rate, improving the functional diversity of the soil microbial community. The results suggested the great potential of planting Astragalus sinicus L. with incubation of Rhizobium huakuii in remediation of PCBs contaminated soils.