Summary
This meta-analysis of 147 studies (1138 data points) found that microplastic exposure significantly increased soil urease and leucine aminopeptidase activities by 7.6% and 8.0% respectively, whilst N-acetyl-β-D-glucosaminidase activity was not significantly affected. Biodegradable microplastics demonstrated more pronounced effects than conventional variants, and enzyme responses varied substantially based on microplastic properties, experimental conditions (laboratory vs. field settings, temperature, nitrogen fertilisation), and soil characteristics (pH, organic carbon content, texture). The findings underscore the need for context-specific management strategies to mitigate microplastic pollution impacts on soil ecosystem functioning.
Regional applicability
The meta-analysis is geographically global and thus applicable to United Kingdom soil contexts, though the specific magnitude of microplastic effects will depend on local soil properties (pH, organic matter), climate conditions, and microplastic polymer composition prevalent in UK agricultural and terrestrial systems. UK soil scientists and policymakers should consider these enzyme-level responses when assessing risks from microplastic accumulation in managed and natural soils.
Key measures
Soil urease activity (%), leucine aminopeptidase activity (%), N-acetyl-β-D-glucosaminidase activity; microplastic properties (polymer type, size, concentration); soil properties (clay content, pH, organic carbon, total nitrogen); experimental conditions (field vs. laboratory, temperature, nitrogen fertilization)
Outcomes reported
This meta-analysis of 147 studies assessed the impact of microplastics on soil nitrogen-acquisition enzyme activities, measuring changes in urease, leucine aminopeptidase, and N-acetyl-β-D-glucosaminidase activities. The study examined how microplastic properties, experimental conditions, and soil characteristics influence these enzyme responses.
Topic tags
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