The contamination with organic and inorganic pollutants changes significantly soil microbial community structure. These shifts indicate anthropogenic pressure and help to discover new possibilities for soil remediation. In this study, the microbial community structure of Spolic Technosols formed at the territory of a former industrial sludge reservoir near the Kamensk-Shakhtinsky (Southern Russia) was studied using a metagenomics approach. The studied soils contain high concentrations of heavy metals (HM) (up to 72,900 mg kg−1) and 16 priority polycyclic aromatic hydrocarbons (PAHs) (up to 6670 mg kg−1). Its microbial communities demonstrate an excellent adaptability level reflected in their complexity and diversity. As shown by the high values of alpha diversity indices (Shannon values up to 10.1, Chao1 values from 1430 to 4273), instead of decreasing quantitatively and qualitatively on the systemic level, microbial communities tend to undergo complex redistribution. Regardless of contamination level, the share of Actinobacteria and Proteobacteria was consistently high and varied from 20 to 50%. Following the results of the Mann–Whitney U test, there were significant changes of less abundant phyla. The abundance of oligotrophic bacteria from Gemmatimonadetes and Verrucomicrobia phyla and autotrophic bacteria (e.g., Nitrospira) decreased due to the high PAH’s level. And abundance of Firmicutes and amoebae-associated bacteria such as TM6 and soil Chlamydia increased in highly contaminated plots. In the Spolic Technosols studied, the influence of factors on the microbial community composition decreased from PAHs concentration to soil characteristics (organic carbon content) and phylum–phylum interactions. The high concentrations of HMs influenced weakly on the microbial community composition.
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The present research was funded by the Russian Science Foundation through Project No. 19-74-10046. We thank the centers for collective use of Southern Federal University "Modern Microscopy" and "High Technology" for performing chemical-analytical experiments and center for collective use of Kazan Federal University "Interdisciplinary Center of Shared Facilities" for performing metagenomics analysis.
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Gorovtsov, A., Demin, K., Sushkova, S. et al. The effect of combined pollution by PAHs and heavy metals on the topsoil microbial communities of Spolic Technosols of the lake Atamanskoe, Southern Russia. Environ Geochem Health (2021). https://doi.org/10.1007/s10653-021-01059-x
- Anthropogenic impact
- Toxic elements
- Soil pollution
- Heavy metals
- Microbial communities
- Long-term contamination