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Integrated physicochemical and microbial analyses reveal redox-driven microbial community structure in a polycyclic
Simon Vandersanden1, Johan van Leeuwen2, Jaco Vangronsveld3
1Environmental Microbiology, Centre for Environmental Sciences, Department of Biology, Faculty of Sciences, Hasselt University, Diepenbeek, Belgium.
Environmental Pollution (Barking, Essex : 1987)
|June 9, 2026
Summary
Microbial communities in polycyclic aromatic hydrocarbon (PAH)-polluted soil are shaped by electron acceptors and pollution levels. Understanding these factors and redox environments is key to improving bioremediation strategies for contaminated sites.
Area of Science:
- Environmental Science
- Microbiology
- Geochemistry
Background:
- Hydrocarbon-polluted sites pose global environmental challenges.
- Bioremediation efficiency is hindered by environmental and microbial factors.
- Understanding soil microbiome-physicochemical parameter links is crucial for advancing bioremediation.
Purpose of the Study:
- Investigate the relationship between soil microbiome and physicochemical parameters in a polycyclic aromatic hydrocarbon (PAH)-polluted soil core.
- Identify factors limiting biodegradation efficiency in situ.
- Explore microbial community structure and function in relation to environmental conditions.
Main Methods:
- Collected a 3-meter soil core from a historically PAH-polluted site in The Netherlands.
- Sampled soil at six depths (50 cm intervals).
- Performed physicochemical characterization (PAH, electron acceptors, pH, electrical conductivity) and detailed microbial community analysis.
Main Results:
- Microbial communities are primarily influenced by electron acceptor availability and pollution levels.
- Groundwater level fluctuations impact electron acceptor transport and replenishment.
- Diverse metabolic strategies were observed in microbial communities to manage electron oversupply.
- PAH-polluted soil microbial communities vary based on habitat-specific redox environments.
Conclusions:
- Microbial community analysis can diagnose physicochemical constraints limiting biodegradation.
- Integrated physicochemical and microbial analyses are valuable for identifying in situ biodegradation limitations.
- Findings offer insights into the heterogeneous nature of in situ biodegradation in PAH-polluted soils.
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