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Updated: May 22, 2025
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Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture
Published on: May 10, 2013
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Insights into soil microbial assemblages and nitrogen cycling function responses to conventional and biodegradable
Lili Rong1, Yu Wang1, Peter Meidl2
1MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Journal of Hazardous Materials
|March 13, 2025
Summary
Biodegradable polylactic acid (PLA) microplastics alter soil microbes and nitrogen cycling more than conventional polyvinyl chloride (PVC) microplastics. PLA microplastics enriched beneficial bacteria and enhanced nitrogen fixation, unlike PVC microplastics.
Area of Science:
- Environmental Science
- Soil Science
- Microbiology
Background:
- Biodegradable microplastics (MPs) are proposed as sustainable alternatives to conventional MPs.
- Their distinct effects on soil microbial communities and ecological functions remain insufficiently understood.
Purpose of the Study:
- To compare the impacts of biodegradable polylactic acid (PLA) and conventional polyvinyl chloride (PVC) MPs on soil microbial assemblages and nitrogen cycling.
Main Methods:
- Soil samples were treated with 2% and 7% (w/w) PLA and PVC MPs.
- Microbial diversity, community structure, and nitrogen cycling genes (nifH, amoA, nirK, nirS) were analyzed.
Main Results:
- PLA MPs (2% and 7%) reduced bacterial diversity but enriched specific genera and increased nitrogen-fixing bacteria (nifH).
- PVC MPs (2% and 7%) had minimal impact on bacterial diversity, with only temporary structural shifts at high concentrations.
- PLA MPs enhanced microbial complexity and nitrogen cycling functions, including denitrification, at higher doses.
- PVC MPs showed only short-term effects on soil nitrogen cycling.
Conclusions:
- Biodegradable PLA MPs significantly alter soil microbial communities and nitrogen cycling, with distinct impacts compared to conventional PVC MPs.
- These findings are crucial for sustainable agriculture and managing MP-related environmental risks in soil ecosystems.
