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Plastic Particles Driving Cadmium Mobility and Nitrous Oxide Emissions: Revealing Microbial Fe–N Interactions in Wetlands
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Plastic particles driving cadmium mobility and nitrous oxide emissions: Revealing microbial Fe–N interactions in wetlands
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Researchers exposed wetland soil columns to polypropylene microplastics and found that MPs increased nitrous oxide emissions by 45%, raised exchangeable cadmium fractions by 28%, and decreased plant cadmium uptake by 56%, revealing that microplastics alter both greenhouse gas cycling and heavy metal bioavailability in urban wetlands.
Microplastics can Alter the Nitrogen Cycle in Surface Flow Constructed Wetlands
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Both conventional PVC and biodegradable PLA microplastics disrupted nitrogen cycling in constructed wetlands, with PVC causing ammonium accumulation and PLA acting as a carbon source, while both enhanced biofilm formation and enzyme activities at higher concentrations. These polymer-specific effects on nitrogen dynamics reveal that microplastic contamination poses distinct and complex threats to the water treatment functions of natural and engineered wetlands.
The Effect of N Mineralization, Nitrification and Ammonification Rates in Soils Contaminated with Microplastics
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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.
Effects of microplastics on carbon and nitrogen cycling in coastal wetlands: A critical meta-analysis
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This meta-analysis of over 1,000 data points from 34 studies found that microplastics significantly altered certain carbon and nitrogen cycling indicators in coastal wetlands under laboratory conditions, but tidal simulation experiments more representative of real environments showed no significant effects. The findings caution against over-interpreting lab results and highlight that tidal dynamics and vegetation factors are often missing from experimental designs.
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