Specific features of the response of soil microbiota components to petroleum contamination

Summary

This experimental study examined how different soil microbial communities respond to petroleum contamination using artificially contaminated soil samples across a wide concentration gradient. The research identified distinct response patterns: bacterial abundance peaked at moderate contamination (10–100 cm³/kg) then declined sharply, whilst hydrocarbon-oxidising and spore-forming bacteria showed greater resilience. Microscopic fungi exhibited different adaptive mechanisms, remaining relatively abundant even at the highest contamination level (500 cm³/kg), suggesting taxa-specific survival strategies under petroleum stress.

Regional applicability

Whilst conducted in Ukraine, the findings on microbial community responses to petroleum contamination have broad applicability to United Kingdom soil remediation practice and assessment protocols. The concentration-dependent effects and differential resilience of microbial functional groups could inform strategies for bioremediation and risk assessment of contaminated sites in the UK, though site-specific soil conditions and microbial communities would require local validation.

Key measures

Bacterial and fungal colony-forming units (CFU) across oil concentrations (1, 5, 10, 50, 100, 200, 300, 500 cm³/kg); abundance of physiological groups including hydrocarbon-oxidising bacteria, spore-forming bacteria, and microscopic fungi

Outcomes reported

The study measured changes in bacterial and fungal abundance (colony-forming units) across eight oil contamination levels (1–500 cm³/kg), identifying differential responses of physiological groups including hydrocarbon-oxidising bacteria, spore-formers, and microscopic fungi. Results revealed a concentration-dependent pattern: initial proliferation at moderate levels (10–100 cm³/kg), suppression at higher concentrations, and differential survival mechanisms at extreme contamination (500 cm³/kg).

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