Microplastic induces microbial nitrogen limitation further alters microbial nitrogentransformation: Insights from metagenomic analysis
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View abstract on PubMed
Summary
This summary is machine-generated.Biodegradable microplastics alter soil microbes, boosting nitrogen-fixing and denitrifying genes but reducing net nitrogen mineralization. This suggests they can cause soil nitrogen limitation, especially in less fertile soils.
Area Of Science
- Environmental Microbiology
- Soil Science
- Biogeochemistry
Background
- Microplastics significantly impact soil microbial communities and nitrogen (N) cycling.
- Understanding microplastic effects on N-cycling genes is limited.
- Conventional (PE, PET) and biodegradable (PLA, PBAT) microplastics are widely used.
Purpose Of The Study
- Investigate microplastic impacts on N-cycling genes in contrasting soils.
- Determine how biodegradable microplastics affect microbial N functional profiles.
- Assess microplastic influence on net N mineralization and microbial community structure.
Main Methods
- 120-day soil incubation experiment.
- Analysis of conventional and biodegradable microplastics in black and loess soils.
- 16S rRNA and metagenomic sequencing to assess microbial communities and N-cycling genes.
Main Results
- Biodegradable microplastics significantly altered microbial N functional profiles.
- Enhanced abundance of key N-cycling genes (fixation, mineralization, reduction, denitrification).
- Decreased net N mineralization, indicating microbial N immobilization exceeded N mineralization.
Conclusions
- Biodegradable microplastics act as a carbon source, selecting taxa that enhance N bioavailability.
- Microbial N demand leads to community filtering (reduced diversity, increased abundance) and specific function-taxon modules.
- Microbes in less fertile loess soil are more sensitive to biodegradable microplastics, suggesting future increased use may accelerate soil N limitation.
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