Meta Analysis
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AI-assigned paper type based on the abstract. Classification may not be perfect — flag errors using the feedback button.
Tier 1
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Systematic review or meta-analysis. Synthesizes findings across many studies. Strongest evidence.
Environmental Sources
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Microplastic effects on soil nitrogen cycling enzymes: A global meta-analysis of environmental and edaphic factors
Journal of Hazardous Materials2024
18 citations
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Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count.
Score: 70
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0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.
This large-scale meta-analysis of 147 studies found that microplastics in soil significantly increased urease and leucine aminopeptidase enzyme activities by about 8%, potentially disrupting nitrogen cycling. Biodegradable microplastics had more pronounced effects than conventional plastics, and responses depended on soil pH, polymer type, particle size, and concentration.
Microplastic accumulation in soil ecosystems poses significant environmental concerns, potentially impacting nitrogen cycling processes and ecosystem health. This meta-analysis of 147 studies (1138 data points) assessed the impact of microplastics (MPs) on soil nitrogen-acquisition enzymes. We found that MPs exposure significantly increased soil urease (UE) and leucine aminopeptidase activities by 7.6 % and 8.0 %, respectively, while N-acetyl-β-D-glucosaminidase activity was not significantly affected. Biodegradable MPs showed more pronounced effects compared to conventional MPs. Enzyme activities were influenced by MPs properties (e.g., polymer type, size, concentration), experimental conditions (e.g., field or laboratory setting, temperature, nitrogen fertilization), and soil properties (e.g., clay content, pH, organic carbon, total nitrogen). For instance, acidic soils enhanced UE activity, while neutral soils reduced it. These findings emphasize the complex interactions between MPs and soil ecosystems, highlighting the need for context-specific environmental management strategies and policy-making approaches to mitigate the impacts of MPs pollution on soil health.