微塑料在城市土壤中的微生物社区结构和功能中的作用
1School of Geographic Sciences, Nanjing University of Information Science & Technology, Nanjing 210044, China; School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210046, China.
Journal of hazardous materials
|July 28, 2023
概括
城市土壤中的微塑料会影响微生物群落,改变细菌多样性和基因丰富性. 这项研究强调了需要更好的城市绿地管理,以减轻MP对土壤微生物的影响.
科学领域:
- 环境科学 环境科学
- 土壤微生物学 土壤微生物学
- 生态毒理学 生态毒理学
背景情况:
- 实验室研究表明,微塑料 (MP) 对土壤微生物产生负面影响,影响微生物社区的结构和功能.
- 然而,MPs对复杂,高活动的城市环境中的微生物的影响仍未得到充分报告.
- 城市绿地对微生物多样性至关重要,但也可能导致全球土壤微生物和基因同质化.
研究的目的:
- 调查微塑料对不同城市功能区内的城市土壤微生物的影响.
- 分析微塑料类型,污染因素,微生物群落和功能基因变异之间的关系.
- 填补有关MP对实际城市环境中的土壤微生物的影响的知识空白.
主要方法:
- 分析了来自7个不同的城市功能区的标准化地块的42个土壤样本.
- 评估微生物社区结构 (OTU) 和功能基因,包括抗生素耐药性基因 (ARG) 和营养循环基因.
- 统计分析,包括部分最小平方路径建模 (PLS-PM),以确定MP和污染因素的影响.
主要成果:
- 与MP丰富土壤中的真菌群体相比,细菌群体在OTU中表现出更大的差异.
- 与MP水平较低的土壤相比,MP水平较高的土壤显示出大多数ARG和营养循环基因的丰度相似或略低.
- 聚乙烯二甲 (PET) 和聚烯 (PP) 的MP显著解释了微生物群落和功能基因的变异 (分别为3.54%和6.03%).
- 污染因子和MP的相互作用表明,观察到的相关性具有显著的解释能力.
结论:
- 城市土壤中的微塑料显著影响微生物社区的结构和功能,影响因塑料类型和环境环境而异.
- 城市绿地在微生物多样性和全球同质化方面发挥着双重作用,进一步受到微塑料污染的影响.
- 调查结果为管理城市绿色空间和减轻与微塑料污染相关的生态风险提供了关键的见解.
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