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Biodegradable vs. Traditional Microplastics:Their Impact on Seed Germination and Diversity in Wetland Soil Seed Banks
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Source, Environmental Behavior and Ecological Impact of Biodegradable Microplastics in Soil Ecosystems: A Review
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This review finds that biodegradable plastics do not fully break down as commonly assumed—they fragment into microplastics that alter soil chemistry, disrupt microbial communities, harm soil organisms, and amplify the toxicity of co-occurring pollutants. The widespread adoption of biodegradable plastics as an environmental solution may be creating a new category of soil microplastic contamination with its own distinct ecological risks.
Effects of Conventional and Biodegradable Microplastics on Soil Physicochemical Properties and Microorganisms
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A four-month soil incubation experiment compared conventional polyethylene (PE) and biodegradable polylactic acid (PLA) microplastics, finding both alter soil organic carbon, nitrogen availability, enzyme activity, and microbial community composition — with PLA causing distinct effects due to its degradability. The finding that biodegradable plastics still significantly disrupt soil microbiology challenges assumptions about their environmental safety and suggests replacing conventional plastics with PLA does not eliminate ecological harm.
Microplastic Pollution in Terrestrial Systems: Sources and Implications for Soil Functioning and Plant Performance
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Researchers reviewed how microplastics enter terrestrial ecosystems through atmospheric deposition, irrigation, and agricultural mulching and found they reduce soil moisture, disrupt microbial communities, impair nutrient cycling, and harm earthworms — collectively threatening soil health and plant performance in agricultural and natural systems.
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.
Evidence of Soil Microplastics Inhibiting the Germination of Commercial Coriander Seeds Under Field Conditions
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Field and greenhouse experiments showed that virgin polypropylene, PVC, and polylactic acid microplastics at concentrations as low as 0.05% w/w inhibited coriander seed germination by 60–100% within the first seven days, with PVC causing the greatest inhibition and all polymers inducing oxidative stress in root tips. These results indicate that even unaged microplastics pose direct phytotoxic risks in agricultural soils, threatening crop yields and food security independent of chemical additive leaching.
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