螯合剂与AM真菌联合修复铀污染土壤

以典型铀矿山周边铀污染土壤为基础，选取铀矿周边植物五节芒为试验样本，分析螯合剂与AM真菌联合对植物生物量、铀富集量、土壤pH及营养元素的影响。结果表明，施加柠檬酸(CA)与接种摩西球囊霉菌(Glomus mosseae，Gm)对五节芒生长、铀富集存在不同程度的促进作用，以二者联合处理效果最明显。虽然施加柠檬酸会降低土壤的pH，但接种Gm与五节芒形成的菌根共生体系可以通过自身调节来适应酸性土壤环境；且有效促进了五节芒对矿质营养元素N、P、K的吸收。根际土与植物灰样扫描电镜图显示，联合处理组表面附着颗粒更大更密集，修复效果最佳。螯合剂与AM真菌联合处理植物，对于铀污染土壤能够起到有效的修复作用。

Chelators and AM Fungi Combined to Repair Uranium-contaminated Soil

Based on the uranium-contaminated soil around typical uranium mines, the plant, Miscanthus floridulus, around a uranium mine was selected to analyze the effects of combination of chelator and AM fungi on plant biomass, uranium enrichment, soil pH value and nutrient elements. The results show that citric acid (CA) and Glomus mosseae (Gm) promote the growth of Miscanthus floridulus and uranium enrichment, while the combination of the two has the most obvious effect. Although the application of CA can reduce the pH value of soil, the mycorrhizal symbiotic system formed by inoculating Gm and Miscanthus floridulus can adapt to the acidic soil environment through self-regulation, and it also effectively promote the absorption of mineral nutrients N, P and K. The SEM morphologies of rhizosphere soil and plant ash samples show that the surface attachment particles in the combined treatment group are larger and denser, with the best repair effect. Combined treatment of plants with chelating agents and AM fungi can effectively repair uranium contaminated soil.