尾矿
土壤水分
环境化学
铀矿石
铀
地球化学
环境科学
铀矿
采矿工程
地质学
自行车
化学
地球科学
土壤科学
地理
物理化学
考古
冶金
材料科学
作者
Wenhuan Yuan,Jingye She,Juan Liu,Qiong Zhang,Xudong Wei,Liangbin Huang,Xuan Zhang,Jin Wang
标识
DOI:10.1016/j.jhazmat.2023.132630
摘要
There exists a research gap on microbial functional genes’ role in U geochemical behavior and cycling in U contaminated soils, which has been poorly understood. Herein, 16S rRNA sequencing gene amplifiers and metagenome analysis were applied to probe microbial community structure and functional metabolism of different depth layers of covering soils in U tailings dam. Results showed that the soils were highly enriched with U (47.5–123.3 mg/kg) and a remarkable portion of 35–70% was associated with the labile fractions. It was found that U geochemical distribution was notably interacted with functional genes from N, S, Fe and P related microbes. Importantly, diminution in gene NirK and amplification in nrfH involving in nitrate reduction could induce microbial tolerance to U. Moreover, gene Sat in microbial sulfate reduction, NosZ and NorB in nitrate reduction, phnD, upgA and upgC in P transportation and phnI, phnK, phoA and opd in microbial organic P mineralization, were all closely linked to U geochemical distribution, species and cycling. All these findings disclose the functional genes that may control the transfer and transformation behavior of U in soil environment, which provides important and novel indications for the bio-remediation strategies towards U polluted sites.
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