黑麦草-AMF联合修复铀污染土壤的根际效应

Rhizosphere Effect of Ryegrass-AMF Combined Remediation of Uranium Contaminated Soil

为探究丛枝菌根真菌对植物根际铀的迁移和形态的影响,以铀矿山周边土壤为基础配制多种铀浓度土壤,选取黑麦草作为供试植物,根内球囊霉(Glomus intraradice,Gi)为供试菌株进行盆栽试验。结果显示:黑麦草接种Gi后会促进土壤中的铀向根际和植物根部迁移,铀浓度分布由高到低依次为黑麦草根部、根际土和非根际土;接种Gi改变了根际土中铀的存在形态,黑麦草根际土中的活性态铀占比由32.6%降到30.0%,惰性铀占比由24.9%降至16.3%,潜在活性铀占比由42.5%升至53.7%。接种Gi能促进黑麦草根部对活性态铀的吸收和根际土中惰性态铀向潜在活性态铀的转化。

In order to investigate the effects of arbuscular mycorrhizal fungi on migration and morphology of inter-root uranium in plants,a variety of uranium-concentrated soils were configured based on the soils around uranium mines,and ryegrass was selected as test plant and Glomus intraradice(Gi)was selected as test strain to carry out potting experiments.The results show that ryegrass inoculation with Gi promotes the migration of uranium in soil to the inter-root and plant roots,and the distribution of uranium concentration from high to low is in ryegrass roots,inter-root soil and non-inter-root soil.The inoculation of Gi changes the existent morphology of uranium in the inter-root soil,and the percentage of active state uranium in ryegrass inter-root soil reduces from 32.6% to 30.0%,and the percentage of inert uranium reduces from 24.9% to 16.3%,while the proportion of potentially active uranium increases from 42.5% to 53.7%.Gi inoculation can promote the absorption of active uranium in ryegrass roots and the conversion of inert uranium to potentially active state uranium in inter-root soil.