Differential impacts of polyethylene microplastic and additives on soil nitrogen cycling: A deeper dive into microbial interactions and transformation mechanisms
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View abstract on PubMed
Summary
This summary is machine-generated.Plastic additives and microplastics alter soil nitrogen cycling by affecting microbial communities and functional genes. Additives are less conducive to nitrogen degradation and microbial immobilization compared to microplastics and resin.
Area Of Science
- Environmental Science
- Soil Science
- Microbiology
Background
- Microplastic pollution is a growing concern, with its effects on soil nutrient cycling, especially nitrogen, being poorly understood.
- Soil microbial communities are crucial for nutrient cycling, but their response to plastic contaminants is not fully elucidated.
Purpose Of The Study
- To investigate the impact of polyethylene microplastics, polyethylene resin, and plastic additives on soil nitrogen content, physicochemical properties, and nitrogen cycling.
- To analyze the effects on nitrogen cycling functional genes, microbial composition, and nitrogen transformation rates.
Main Methods
- Quantified soil nitrogen content and physicochemical properties.
- Assessed nitrogen cycling functional genes and microbial community composition using molecular techniques.
- Measured gross nitrogen transformation rates (ammonification, nitrification, immobilization).
Main Results
- All amendments increased total nitrogen but decreased dissolved total nitrogen; additives showed the lowest inorganic nitrogen.
- Polyethylene microplastics and additives increased dissolved organic nitrogen, while resin reduced it and increased microbial biomass.
- Amendment type significantly influenced microbial community structure, functional genes, and nitrogen transformation rates, with additives being more inhibitory.
Conclusions
- Plastic additives, compared to microplastics and resin, negatively impact nitrogen cycling by inhibiting microbial immobilization and transformation rates.
- Soil physicochemical properties and microbial community structure are key factors mediating the effects of plastic contaminants on nitrogen cycling.
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