Summary
This controlled laboratory experiment examined how microplastic fibres (0.4% w/w) alter greenhouse gas emissions from an intensively N-fertilised arable soil. Microplastics increased soil aggregate water-stability and air permeability, resulting in higher CO₂ fluxes but lower N₂O emissions—a divergent pattern likely explained by improved soil aeration favoring aerobic mineralization whilst inhibiting denitrification. The findings suggest microplastic impacts on soil greenhouse gas dynamics warrant inclusion in future environmental impact assessments.
UK applicability
The results are potentially relevant to UK arable farming, where microplastic accumulation in soils is an emerging concern and N-fertiliser application is widespread. However, this was a single-soil laboratory study under controlled conditions; field validation across UK soil types and climates would be needed to guide policy or practice.
Key measures
CO₂ and N₂O flux rates (continuous monitoring), soil aggregate water-stability, pneumatic conductivity, soil structure properties
Outcomes reported
The study measured CO₂ and N₂O emissions from soil before and after urea fertiliser application, and assessed changes in soil properties including aggregate water-stability and pneumatic conductivity in response to microplastic fibre additions.
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