Abstract
Investigations of the impact of heavy metals on microbial community structure are crucial for bioremediation of the contaminated sites. To this end, high-throughput 16S rRNA sequencing was performed to assess the variations of bacterial communities in 6 heavy metal-contaminated soils sampled from Liujiaping (LJP) and Shanping (SP) lead–zinc tailings situated in northwestern China. Compared with those of the farmland soil (NT), the heavy metal levels and chemical properties of the tailing soils were significantly different. Consistently, the bacterial community structures have been changed, displaying as the bacterial richness and diversity in the tailing soils were either increased or decreased, i.e., trending as SP > NT > LJP. The relative abundances of certain bacterial phyla mainly including Actinobacteriota, Acidobacteriota, Cyanobacteria, Gemmatimonadota, and Bacteroidota were significantly increased in certain SP and/or LJP soils. Further, the relative abundances of Actinobacteriota and Bacteroidota were positively correlated with Cd, TP, TK, SOM, TN, and pH. The abundance of Cyanobacteria was significantly upregulated by Cu, Zn, and TP. Acidobacteriota was notably positively correlated with Cr, Pb, and NO3−_N. On the contrary, the relative abundance of Chloroflexi was negatively correlated with all the environmental parameters, especially with Cd, NO3−_N, TP, SOM, and TN. Together, our results implied that the heavy metals and chemical properties were both driving forces of the variations of the bacterial community structures in the tailing soils. Overall, we have successfully identified certain bacterial species such as s__unclassified_g__Sulfurifustis, s__unclassified_f__Rhodanobacteraceae, s__unclassified_g__Conexibacter, s__unclassified_g__norank_f__norank_o__Gaiellales, and s__unclassified_g__Blastococcus which were probably heavy metal-tolerant in these specific tailing soils, and this will provide a theoretical support for further bioremediations.
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The authors are thankful to all the colleagues whose comments that have improved the quality of the manuscript.
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This work was funded by the National Natural Science Foundation of China (grant numbers 31860176, 31700059, 41977204), Key Research and Development Program of Shaanxi (2020ZDLSF06-06), Key Research and Development Program of Gansu (20YF3FA037), Natural Science Basic Research Program of Shaanxi (2021JM-510, 2021JQ-791, 2021JQ-792), Science and Technology Program of Xi’an (20NYYF0013), XAWLKYTD012, YZJJ202102, YZJJ202110, and National Undergraduate Training Program for Innovation and Entrepreneurship (S202011080011).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Tianpeng Gao, Haijuan Li, Yueqing He, Yuanyuan Shen, Guangwen Li, Xiangkai Li, Yueli Chen, Yubing Liu, Changming Li, Jing Ji, Jing Xu, and Guohua Chang. The first draft of the manuscript was written by Tianpeng Gao and Haijuan Li, and all authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.
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Gao, T., Li, H., He, Y. et al. The Variations of Bacterial Community Structures in Tailing Soils Suffering from Heavy Metal Contaminations. Water Air Soil Pollut 232, 392 (2021). https://doi.org/10.1007/s11270-021-05338-2
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DOI: https://doi.org/10.1007/s11270-021-05338-2