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| Evaluation of the remedial effect of a decommissioned uranium tailings pond from the perspective of the archaea community |
| Received:September 30, 2022 Revised:December 15, 2022 |
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| KeyWord:decommission;uranium tailings pond;archaeal community;microecology;remedial effect |
| Author Name | Affiliation | E-mail | | YI Yingda | Research Center of Radiation Ecology and Ion Beam Biotechnology, College of Physics Science and Technology, Xinjiang University, Urumqi 830017, China | | | CHEN Henglei | Research Center of Radiation Ecology and Ion Beam Biotechnology, College of Physics Science and Technology, Xinjiang University, Urumqi 830017, China | | | FENG Guangwen | Research Center of Radiation Ecology and Ion Beam Biotechnology, College of Physics Science and Technology, Xinjiang University, Urumqi 830017, China | feng_guang_wen@163.com |
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| Abstract: |
| This study aimed to evaluate the effect of retirement management on a uranium tailings pond in northwest China from the perspective of microecological archaeal community. Initially, the early-stage distribution characteristics of radionuclides and heavy metals/ metalloids in the 0-5 cm and 5-15 cm vertical profiles of the overburden layer of the tailings pond were measured. Then, 16S rRNA gene amplification sequencing technology was used to sequence and analyze the soil archaea community, and bioinformatics was used to study the characteristics of the soil archaea community and its response to environmental factors in the uranium tailings pond and adjacent areas. The results demonstrated that there was no significant difference in the structure of soil archaea dominant community between the tailings pond and the adjacent area, even though four dominant phyla and three dominant genera were unevenly distributed in the soil. The diversity indexes（Chao1, ACE, and Shannon index）and similarity analysis（PCoA）of soil archaea showed that there were no differences among the communities, and the community composition was similar. The results of redundancy analysis（RDA）showed that pH, total nitrogen, total organic carbon, 232Th levels, and electrical conductivity of soil were the main environmental factors affecting the dominant flora. However, it did not significantly change the structure of the soil flora inside and outside the tailings pond area. There were no obvious differences between the soil community of the tailings pond and the adjacent area, indicating that the soil community inside and outside the tailings pond were not significantly affected by radionuclides and heavy metals / class metals. These findings reflect that decommissioning the tailings pond was an effective management decision. |
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