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Effects of microplastics on sedimentary greenhouse gas emissions and underlying microbiome-mediated mechanisms: A comparison of sediments from distinct altitudes.
- Source :
-
Journal of hazardous materials [J Hazard Mater] 2024 Aug 05; Vol. 474, pp. 134735. Date of Electronic Publication: 2024 May 25. - Publication Year :
- 2024
-
Abstract
- Microplastics (MPs) are emerging contaminants in aquatic ecosystems that can profoundly affect carbon and nitrogen cycling. However, the impact mechanisms of MPs on sedimentary greenhouse gas (GHG) emissions at distinct altitudes remain poorly elucidated. Here, we investigated the effects of polyvinyl chloride (PVC) and polylactic acid (PLA) on sedimentary CO <subscript>2</subscript> , CH <subscript>4</subscript> , and N <subscript>2</subscript> O emissions at distinct altitudes of the Yellow River. PVC increased the relative abundance of denitrifiers (e.g., Xanthobacteriaceae, Rhodocyclaceae) to promote N <subscript>2</subscript> O emissions, whereas PLA reduced the abundance of AOA gene and denitrifiers (e.g., Pseudomonadaceae, Sphingomonadaceae), impeding N <subscript>2</subscript> O emissions. Both PVC and PLA stimulated the growth of microbes (Saprospiraceae, Aquabacterium, and Desulfuromonadia) associated with complex organics degradation, leading to increased CO <subscript>2</subscript> emissions. Notably, the concurrent inhibition of PLA on mcrA and pmoA genes led to its minimal impact on CH <subscript>4</subscript> emissions. High-altitude MQ sediments, characterized by abundant substrate and a higher abundance of functional genes (AOA, AOB, nirK, mcrA), demonstrated higher GHG emissions. Conversely, lower microbial diversity rendered the low-altitude LJ microbial community more susceptible to PVC, leading to a more significant promotion on GHG emissions. This study unequivocally confirms that MPs exacerbate GHG emissions via microbiome-mediated mechanisms, providing a robust theoretical foundation for microplastic control to mitigate global warming.<br />Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024. Published by Elsevier B.V.)
- Subjects :
- Altitude
Methane metabolism
Polyvinyl Chloride
Bacteria drug effects
Bacteria genetics
Bacteria classification
Bacteria metabolism
Water Pollutants, Chemical analysis
Water Pollutants, Chemical toxicity
Nitrous Oxide analysis
Rivers microbiology
Rivers chemistry
Geologic Sediments microbiology
Microbiota drug effects
Greenhouse Gases
Microplastics toxicity
Carbon Dioxide analysis
Polyesters metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1873-3336
- Volume :
- 474
- Database :
- MEDLINE
- Journal :
- Journal of hazardous materials
- Publication Type :
- Academic Journal
- Accession number :
- 38823103
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2024.134735