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Effect of microplastics on carbon, nitrogen and phosphorus cycle in farmland soil: A meta-analysis
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This meta-analysis of 102 studies found that microplastics in farmland soil increased soil organic carbon, microbial biomass carbon, and microbial biomass nitrogen, but also elevated CO2, methane, and nitrous oxide emissions through enhanced carbon mineralization and denitrification. Microplastic biodegradability, size, concentration, and soil properties all drove these effects, suggesting agricultural microplastic pollution may worsen greenhouse gas emissions from farmland.
Farmland soil is a major sink for microplastics (MPs). Despite recognized potential impacts on soil ecosystems, comprehensive assessments of MPs' effects on carbon (C), nitrogen (N), and phosphorus (P) cycling in agricultural soils are limited. Data from 102 peer-reviewed studies were analyzed to elucidate the effects of MPs exposure on the C, N, and P cycles in soil. Results showed increased concentrations of soil organic carbon (SOC), dissolved organic carbon, microbial biomass carbon, and microbial biomass nitrogen, accompanied by elevated emissions of carbon dioxide (CO), methane (CH), and nitrous oxide (NO) after MPs introduction. A random forest model revealed that soil C, N, and P cycles are driven by MPs characteristics (biodegradability, size, concentration), soil properties (initial pH, SOC, total N, clay content), and experimental conditions (incubation period, soil moisture). Complex interactions between MPs and soil C, N, and P were illustrated, with increased CO, CH, and NO emissions due to C mineralization and enhanced denitrification rates caused by MPs. These negative effects imply a need for strengthened management of C, N, and P cycles in agricultural soil to reduce farmland ecosystems' contributions to greenhouse gas emissions.
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This review examines how microplastics in agricultural soils affect carbon and nitrogen cycles and alter greenhouse gas emissions. Researchers found that microplastics reduce soil water retention, decrease soil respiration, and increase emissions of carbon monoxide, methane, and nitrous oxide. The study reveals that microplastic contamination in farmland may have broader climate implications by disrupting the soil processes that regulate greenhouse gas fluxes.
Effect of microplastics on soil greenhouse gas emissions: A global meta-analysis study
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This global meta-analysis found that microplastic exposure in soil decreased nitrous oxide emissions by 28.5% and increased methane emissions by 28.6%, though neither change was statistically significant overall. Effects varied dramatically depending on microplastic shape, concentration, soil type, and pH, with fiber-shaped microplastics reducing CO2 emissions by 40% while microplastics in sandy soils increased CO2 by 21%.
Could soil microplastic pollution exacerbate climate change? A meta-analysis of greenhouse gas emissions and global warming potential
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The first meta-analysis linking soil microplastic pollution to greenhouse gas emissions found that microplastics increased overall emissions, with the strongest effect being a 60% increase in methane. Polyethylene caused the highest methane emissions, phenol-formaldehyde had the greatest global warming potential via nitrous oxide, and greenhouse gas emissions rose sharply when soil microplastic content exceeded 0.5%.
Microplastics and Soil Greenhouse Gas Emissions: A Critical Reflection on Meta-Analyses
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This meta-analysis pools data from multiple studies to assess whether microplastics in agricultural soil affect greenhouse gas emissions. The findings reveal that the environmental impact of microplastics extends beyond direct toxicity, as they may alter soil microbial activity in ways that contribute to climate change.
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