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Zinc-containing PVC microplastics reduce soil microbial activity and alter community structure in the plastisphere following UV-induced weathering
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Researchers studied how zinc-containing PVC microplastics affect soil health before and after UV weathering and found that UV aging dramatically increased zinc release into soil. The weathered microplastics with high zinc content inhibited soil microbial activity, reduced bacterial diversity, and shifted community structure, highlighting how plastic additives can amplify the environmental impact of microplastic pollution in agricultural soils.
Plastic pollution poses a significant threat to agricultural ecosystems, yet the effects of metal additives in these plastics on soil health remain understudied. We investigated how new and UV-weathered PVC plastic film with realistic nano-ZnO addition rates (0, 1, and 5 % wt.) affected soil properties and microbial communities. UV aging significantly enhanced Zn release from nano-ZnO PVC plastics, substantially increasing both the total and bioavailable Zn concentrations in soil. UV-aging of PVC containing 1 % ZnO increased total soil Zn by ca. 2-fold and available Zn by ca. 6-fold, while in the 5 % ZnO treatment, total Zn increased 6-fold (reaching 649 mg kg-1) and available Zn ca. 25-fold (reaching 159 mg kg-1). FTIR analysis revealed formation of new functional groups after UV aging, including -OH groups and unsaturated C=C bonds due to PVC dehydrochlorination. Using 14C-isotope tracing, we demonstrated that UV-aged 5 % wt. ZnO microplastics inhibited soil microbial activity, induced shifts in microbial community structure, reduced bacterial diversity, and resulted in changes in microbial carbon use efficiency (CUE). Conversely, Zn-containing macroplastics showed negligible effects compared to their microplastic counterparts. Relative abundances of Actinomycetota, Planctomycetota, and Verrucomicrobiota increased with higher ZnO additive rates, while Pseudomonadota, Myxococcota, and Gemmatimonadota decreased. This research highlights the need to define critical thresholds for metal additives in plastics used within agriculture and emphasizes the importance of considering both physical fragmentation, UV aging, and chemical additive release when assessing the impact of plastics on soil health and ecosystem functioning.
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Researchers investigated how zinc oxide additives in PVC agricultural films affect soil health and plant growth after the plastic weathers and fragments. They found that UV-aged PVC microplastics containing zinc oxide significantly increased bioavailable zinc in soil, which in turn reduced maize productivity and altered soil microbial communities. The study demonstrates that metal additives in agricultural plastic films can amplify environmental harm as the plastics break down in the field.
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UV Aging Strengthens the Effects of Polyvinyl Chloride Microplastics on Soil Bacterial Community Structure and Predicted Functional Profiles
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Sunlight breaks down plastic bits (like those from PVC pipes and packaging) that end up in soil, and this study found that "sun-aged" microplastics change soil bacteria communities more than fresh, unweathered plastic does—including a possible increase in bacteria linked to antibiotic resistance. Since soil bacteria play a key role in growing our food and keeping ecosystems healthy, this matters because most real-world plastic pollution has already been weathered by sunlight, so studying only "fresh" plastic may underestimate its true impact on the soil that feeds us.
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Researchers exposed agricultural soil to PVC microplastics over a long-term experiment and measured changes in soil chemistry and microbial communities. PVC addition altered soil pH, carbon and nitrogen cycling, and microbial diversity over time. Long-term PVC contamination in farmland soils can disrupt the biological processes that maintain soil fertility and plant health.
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Researchers found that PVC microplastics altered soil chemical properties and significantly affected microbial community composition and enzymatic activities in agricultural soil, with effects varying over different incubation periods in microcosm experiments.
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