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A systematic review of the soil C, N, and P cycles mediated by microplastics: Enzyme activities, greenhouse gas emissions and plant growth
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Impacts of microplastics on terrestrial soil carbon dynamics
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This synthesis shows that microplastics disrupt soil organic carbon sequestration through multiple mechanisms, including leaching dissolved organic matter, altering microbial carbon pump efficiency, and creating hotspots that modify mineral-organic matter interactions within soil aggregates. As microplastics accumulate in agricultural soils globally, their interference with carbon storage could undermine both climate mitigation efforts and the soil ecosystem services that support food production.
Impact of microplastics on soil (physical and chemical) properties, soil biological properties/soil biota, and response of plants to it: a review
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This comprehensive review synthesizes evidence that microplastics alter soil physical structure, chemical properties including pH and nutrient cycling, and the communities of earthworms, collembolans, and microbes that maintain soil health, with cascading effects on plant growth and agricultural productivity. Because healthy soils underpin global food production, microplastic-driven degradation of soil ecosystems represents a long-term threat to food security and introduces a terrestrial route by which plastic contaminants accumulate in crops consumed by humans.
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Researchers found that polypropylene, polyethylene, and PET microplastics all disrupt soil nitrogen cycling, with polypropylene having the most harmful effect — reducing the availability of nitrogen that plants need to grow, raising concerns about long-term agricultural soil health in contaminated areas.
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Polystyrene micro- and nanoplastics altered soil dissolved organic matter, disrupted rhizosphere microbial communities, and affected plant photosynthesis in Chinese cabbage, with effects varying by plastic particle size and soil amendment type. These findings reveal that microplastic contamination can cascade through soil microbiomes to impair crop growth, raising concerns for agricultural productivity and food system safety.
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