Summary
This systematic review of 46 peer-reviewed studies examines the influence of microplastic pollution on soil carbon cycling across diverse ecosystems and soil types. The review reports that most studies document increased CO2 and/or CH4 emissions in microplastic-contaminated soils, though some demonstrate neutral or opposing effects, with outcomes varying by soil type and microplastic characteristics. The authors conclude that further research incorporating a wider diversity of microplastic types is essential to clarify these inconsistent findings and improve understanding of microplastics' role in global carbon cycling.
Regional applicability
UK soils are subject to similar microplastic contamination pathways (sewage sludge application, atmospheric deposition, compost incorporation), making these findings relevant to UK soil management and climate mitigation policy. However, the heterogeneity of results across soil types suggests UK-specific field studies would be needed to determine local implications for carbon budgets and greenhouse gas emissions.
Key measures
CO2 emissions, CH4 emissions, soil microbiome composition and activity, enzyme activity, plant growth responses, litter decomposition rates across different soil types and microplastic types/forms/sizes
Outcomes reported
A systematic review of 46 studies examining how microplastics affect carbon cycling across different soil types and ecosystems, with particular focus on CO2 and CH4 emissions. The review synthesised evidence on mechanisms including impacts on soil microbiomes, enzyme activity, plant growth, and litter decomposition.
Topic tags
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