甲生产和甲生成途径对在米土壤中的聚乙烯纳米塑料暴露的反应
Jinrong Lu1, Rui Hou2, Weijie Peng1
1Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
Journal of hazardous materials
|December 19, 2023
概括
在米土壤中的聚乙烯纳米塑料 (PS-NPs) 延迟了甲的产生,但最终增加了甲的产生率. 微塑料 (PS-MPs) 的影响最小,突出显示纳米塑料.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 土壤科学 土壤科学
背景情况:
- 纳米塑料 (NP) 越来越多地被认为是陆地生态系统中的环境污染物.
- 关于NP形状,功能和代谢影响对米土壤微生物群落无氧甲基生成的影响的理解有限.
研究的目的:
- 研究聚乙烯纳米塑料 (PS-NP) 和微塑料 (PS-MP) 对米土壤中无氧甲基生成的影响.
- 阐明PS-NP和PS-MP对土壤物理化学性质和微生物群落的影响.
主要方法:
- 用PS-NPs和PS-MPs化典型的田土壤.
- 对甲 (CH4),二氧化碳 (CO2) 和乙酸生产的监测.
- 分析土壤的物理化学特性 (pH,电导率).
- 使用分子技术评估微生物社区结构和参与甲基生成的功能基因.
主要成果:
- PS-NPs延迟了甲生产和酸盐含量峰值,但在13天后显著增加了甲生成率 (高达87.97%).
- PS-MPs对CH4,CO2或乙酸生产没有显著影响.
- 通过降低pH值和增加电导率,PS-NP改变了土壤的物理化学特性.
- PS-NPs丰富了乙类甲原体,并增加了乙类通路 (ackA,pta,ACSS,cdhC,cdhD,cdhE) 中的关键基因的丰富性.
- PS-MPs影响了微生物社区结构,但并没有影响甲原性通路.
结论:
- 聚乙烯纳米塑料在米土壤中显著影响无氧甲基生成,主要是通过影响乙结晶路径和改变土壤特性.
- 塑料颗粒的形状和大小在它们对环境的影响中起着至关重要的作用.
- 这项研究为在米土壤生态系统中对纳米塑料污染的微生物和功能反应提供了关键的见解.
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