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Polyvinyl Chloride and Polypropylene Microplastics Impact Soil Total Antioxidant Capacity and Exoenzyme Secretions
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Researchers investigated how polyvinyl chloride (PVC) and polypropylene (PP) microplastics affect soil total antioxidant capacity and exoenzyme secretion activity. The study found that both polymer types disrupted soil biochemical functioning, altering enzyme activity and antioxidant defense mechanisms in ways that could compromise soil health and ecosystem services.
Microplastics (MPs), notably polyvinyl chloride (PVC) and polypropylene (PP), are major pollutants in terrestrial and aquatic ecosystems. PVC and PP are the most used polymers for manufacturing plastic goods and therefore constitute bulk of plastic debris which are the major sources of MPs. This study examines the impact of PVC and PP MPs on soil total antioxidant capacity (TAC) and microbial exoenzyme activities. A 0.25% (w/w) MP addition significantly reduced soil TAC and the activities of amylase, invertase, and dehydrogenase over 72 h, while cellulase activity increased. The effects varied by MP type, with molecular docking revealing stronger MP binding affinities to exoenzymes for PP than PVC, particularly with cellulase. The findings indicate MPs reduce soil antioxidants and most exoenzyme activities, except for cellulase.
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Responses of microbial communities to the addition of different types of microplastics in agricultural soils
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Researchers conducted a 90-day soil incubation study to examine how four types of microplastics — polyethylene, polypropylene, polyvinyl chloride, and polyethylene terephthalate — affect agricultural soil properties and microbial communities. They found that all four types significantly altered soil enzyme activities, nutrient content, and the diversity of microbial populations. The study indicates that microplastic contamination in farmland can disrupt soil health in ways that may affect agricultural productivity.
Response of soil enzyme activities and bacterial communities to the accumulation of microplastics in an acid cropped soil
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Researchers tested how polyethylene and polyvinyl chloride microplastics at different concentrations affect enzyme activity and bacterial communities in acidic agricultural soil. Both types of microplastics reduced the diversity of soil bacteria while stimulating certain enzymes related to nitrogen and phosphorus cycling. The findings suggest that microplastic accumulation in farmland may alter important soil biological processes, potentially affecting nutrient cycling and the breakdown of pollutants.
Response of soil biochemical properties and ecosystem function to microplastics pollution
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This study found that polyethylene microplastics significantly disrupted soil health by reducing enzyme activity, lowering nutrient availability, and impairing overall ecosystem function. Smaller microplastics caused more damage than larger ones, and the effects were dose-dependent, suggesting that as microplastic pollution accumulates in agricultural soil, it could increasingly threaten the soil health that food production depends on.
Impact of PVC microplastics on soil chemical and microbiological parameters
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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.
Effects of Polyethylene Microplastics and Phenanthrene on Soil Properties, Enzyme Activities and Bacterial Communities
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Researchers conducted a year-long soil microcosm experiment finding that polyethylene microplastics and phenanthrene, individually and combined, significantly altered soil pH, enzyme activities, and bacterial community diversity and function, with combined pollution showing the most pronounced effects.
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