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Priming effects induced by degradable microplastics in agricultural soils
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Degradable microplastics induce more soil organic carbon loss via priming effects: a viewpoint
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This viewpoint argues that degradable microplastics, despite being marketed as eco-friendly, may paradoxically accelerate soil organic carbon loss by triggering priming effects that stimulate microbial activity consuming native soil carbon stocks. This finding complicates assumptions about biodegradable plastics as a safe alternative, with implications for soil health, food security, and the long-term carbon cycle.
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This review synthesized evidence on microplastic contamination in terrestrial soil-plant systems, examining effects on soil structure, nutrient cycling, microbial communities, and plant uptake of plastic particles. Because plants can absorb microplastics and translocate them into edible tissue, agricultural soil contamination represents a direct and underappreciated pathway of human dietary exposure to plastic particles.
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Researchers reviewed what is known about microplastic contamination in agricultural soils, noting that despite hundreds of millions of tonnes of plastic entering the environment annually, very little is understood about how microplastics persist, migrate, and affect soil ecosystems. This knowledge gap is concerning given that contaminated soil directly affects food crops consumed by humans.
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