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Soil bacteria around a derelict tailings pile with different metal pollution gradients: community composition, metal tolerance and influencing factors

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Abstract

Bacteria play a vital role in ecological processes of soil contaminated by heavy metals. Here, soil sampling was carried out around a tailings pile contaminated to different degrees by cadmium (Cd), lead (Pb) and arsenic (As). The bacteria in the soil were cultured, separated and purified on Luria–Bertani medium, and the changes in bacterial communities in soils with different pollution levels were analysed with 16S rRNA sequencing. Bacillus pacificus strain MZ520364 was found to be highly tolerant to Cd, Pb and As, and single-metal and multimetal tolerance experiments were further conducted with this strain. The results obtained from alpha diversity and operational taxonomic unit (OTU) statistical analyses showed a significant difference in bacterial composition among soils with different metal pollution levels, and the highest bacterial diversity was found at the most severely polluted site. Evidence from variance partitioning analysis (VPA) and the Spearman correlation heatmap analysis showed that the leading factors affecting bacterial community composition were cation exchange content (CEC), pH, total Zn, total As, and available As concentrations in soil. Additionally, in the single-metal treatments, B. pacificus MZ520364 could tolerate 600 mg/L Cd2+, 1000 mg/L Pb2+ or 700 mg/L As3+. When Cd, Pb and As coexisted, the best growth of B. pacificus MZ520364 was present at 120 mg/L Cd2+, 200 mg/L Pb2+ and 150 mg/L As3+. The effect of Cd, Pb and As on the growth of the strain followed the order of Cd > As > Pb, and the heavy metal combination showed more toxicity than single metals. In summary, our results revealed the ecological impact of soil physicochemical properties on the diversity and richness of soil bacterial communities and suggested that B. pacificus MZ520364 may be used for the remediation of Cd–Pb–As co-contaminated soil.

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Data availability

The datasets used and analysed during the current study are available from the corresponding author on reasonable request. All data generated or analysed during this study are included in this published article.

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Funding

The work was financially supported by the National Natural Science Foundation of China (Grant No.: 31960264).

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T Wang conducted the experiments, data analysis and draft writing. HB Wang conceived and designed the experiments and revised the manuscript. HJ Wang helped with field sampling. KP Feng drew the map of sampling sites. HY Li provided good suggestions for bacterial analysis. All the authors read and approved the final manuscript.

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Correspondence to Hongbin Wang.

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The authors declare no competing interests.

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Wang, T., Wang, H., Feng, K. et al. Soil bacteria around a derelict tailings pile with different metal pollution gradients: community composition, metal tolerance and influencing factors. Environ Sci Pollut Res 29, 60616–60630 (2022). https://doi.org/10.1007/s11356-022-20142-z

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  • DOI: https://doi.org/10.1007/s11356-022-20142-z

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