Summary
Rillig, Leifirth and Lehmann provide a synthetic overview of emerging evidence demonstrating that microplastic accumulation in soils disrupts fundamental carbon cycling processes mediated by soil microorganisms. The review examines multiple pathways through which plastic particle contamination may inhibit microbial decomposition and carbon mineralisation whilst potentially compromising long-term soil carbon sequestration. This work addresses a significant but under-researched environmental stressor with implications for both soil health and climate-relevant greenhouse gas fluxes in agricultural systems.
Regional applicability
Microplastic contamination of UK soils is an emerging concern linked to application of sewage sludge, compost from mixed-waste streams and degradation of plastic mulches and tyre wear in agricultural contexts. These findings suggest that microplastic accumulation may impair carbon cycling capacity in UK soils, with potential consequences for soil carbon storage targets and climate change mitigation strategies.
Key measures
Microbial decomposition rates, carbon mineralisation, soil carbon sequestration, greenhouse gas emissions, microbial community composition and activity in response to microplastic exposure
Outcomes reported
The study synthesises evidence on how microplastic particles alter microbial-mediated carbon cycling pathways in soil, including decomposition rates, carbon mineralisation and soil carbon sequestration potential. The authors examine mechanisms linking plastic contamination to changes in greenhouse gas emissions and microbial community function.
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