Summary
This global meta-analysis of 117 peer-reviewed studies (2160 datasets) examined the impacts of microplastic contamination on soil bacterial communities and nitrogen cycling. Microplastic exposure significantly reduced soil bacterial diversity and richness, whilst differentially affecting nitrogen cycle functions: promoting ammonium assimilation, nitrogen fixation, and urea decomposition but inhibiting nitrification. The findings suggest microplastics may substantially alter soil microbial structure and ecosystem function through disruption of critical nutrient cycling pathways.
UK applicability
As microplastic soil contamination is a global emerging threat, these findings are directly relevant to UK agricultural and soil health policy, particularly regarding sewage sludge application and atmospheric plastic deposition. However, the meta-analysis includes primarily controlled laboratory and greenhouse experiments; field-scale validation under UK climate and soil conditions would strengthen applicability to UK farming systems.
Key measures
Soil bacterial alpha diversity indices; bacterial richness indices; gene abundance for nitrogen cycle processes (ammonium assimilation, nitrogen fixation, urea decomposition, nitrification); effect sizes stratified by microplastic addition rates, particle size, plastic type, soil texture, land use, and study type
Outcomes reported
The study quantified how microplastic addition to soil affects soil bacterial community diversity, richness, and the abundance of genes involved in nitrogen cycling processes. Meta-analysis pooled data from 117 publications describing experiments with soil microplastic exposure and microbial community analysis.
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