2025-06-19 中国科学院(CAS)
Biofilm structure and relative biomass on mulch-derived microplastics. (A) Three-dimensional biofilm structure; (B) microbial morphology on the plastic surface; (C) relative biomass per unit area. Differences shown are statistically significant (p < 0.05) (Image by GUAN Xinyu)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/earth/202506/t20250619_1045825.shtml
- https://www.sciencedirect.com/science/article/abs/pii/S0304389425015572
アセトクロルはプラスチックの微生物群集を変化させることで土壌中のマルチ由来のマイクロプラスチックの老化を促進する Acetochlor promotes the aging of mulch-derived microplastics in soil by altering the plastisphere microbial community
Xinyu Guan, Yumeng Dai, Xiang Li, Zhiyang Han, Xu Li, Zhencheng Su, Xiujuan Wang, Lei Wang, Mingkai Xu
Journal of Hazardous Materials Available online 16 May 2025
DOI:https://doi.org/10.1016/j.jhazmat.2025.138641
Highlights
- Acetochlor was enriched on the surface of mulch-derived microplastics (MDMPs).
- Acetochlor accelerated the aging process of aged-MDMPs.
- Acetochlor promoted biofilms formation on MDMPs.
- Acetochlor differentially impacted plastisphere microbes in the short and long term.
- Pseudomonas remained highly abundant in the plastisphere after acetochlor treatment.
Abstract
Although many studies have already highlighted the effects of mulch-derived microplastics (MDMPs) on adsorbing and spreading organic pollutants, the ecological risks of MDMPs co-contaminated with herbicide and the interaction between them have not been clarified. In this study, the interactions between MDMPs from virgin and aged low-density polyethylene (LDPE) films and the herbicide acetochlor in soil were investigated by microcosmic experiments. Results showed that acetochlor in soil was significantly enriched on the surface of MDMPs, with higher concentration on aged-MDMPs compared to virgin-MDMPs. Acetochlor significantly accelerated the fragmentation of aged-MDMPs, leading to more oxygenated functional groups and promoting biofilm development. Acetochlor also notably altered plastisphere microbial community, with Pseudomonas dominating for an extended period in acetochlor-treated samples. This suggests that Pseudomonas may facilitate the aging of MDMPs, likely due to its dual ability to degrade both acetochlor and polyethylene. Additionally, acetochlor initially increased microbial diversity and interaction complexity in the plastisphere, but decreased them in later phase, resulting in a more specialized community. These findings reported here broaden our understanding of interactions between MDMPs and herbicide in soil and offer insights for improved farmland management practices.
