聚乙烯微塑料对温带盐沼土中CHCl3和CHBr3流动和微生物群体的影响
Jianing Xu1, Jiale Zhang1, Yange Dong1
1College of Environmental Science and Engineering, Qingdao University, Qingdao, 266071, China.
Environmental pollution (Barking, Essex : 1987)
|August 14, 2024
概括
微塑料 (MPs) 在盐沼地的入侵增加了 (CHCl3) 和 (CHBr3) 的排放,这些破坏臭氧层的碳化合物. 这些MP改变了土壤特性和微生物群落,影响了气体流动,突出了环境风险.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 环境化学环境化学
背景情况:
- 众所周知,微塑料 (MP) 影响土壤碳循环.
- 在沿海盐沼地区,MPs对挥发性环碳水化合物的影响,如甲 (CHCl3) 和甲 (CHBr3),仍未得到充分研究.
- CHCl3和CHBr3是严重破坏臭氧层的物质.
研究的目的:
- 研究聚乙烯 (PE) -MPs对沿海盐沼地的土壤CHCl3和CHBr3的来源和沉降特性的影响.
- 探索MP引起的土壤物理化学性质变化,微生物群落和碳化合物排放之间的关系.
主要方法:
- 在室内进行模拟实验,以评估不同PE-MP度对土壤CHCl3和CHBr3排放的影响.
- 分析土壤的物理化学特性,包括总有机碳和溶解有机物质.
- 微生物社区分析,重点关注特定微生物群体和功能基因的丰富性 (例如,美西洛塞拉,德哈洛科科伊德,ctrA,pceA,TC.FEV.OM,soxB).
主要成果:
- 聚乙烯微塑料显著促进了CHCl3和CHBr3的排放,在第3天和第15天观察到的峰值排放.
- 添加MP改变了土壤特性和微生物群落;土壤总有机碳与CHCl3正相关,而溶解的有机物则影响了CHBr3.
- 在脱过程中关键的微生物参与者 (Methylocella,Dehalococcoides,ctrA) 和参与碳水化合物循环的基因 (pceA,TC.FEV.OM,soxB) 的丰富程度受到PE-MPs的显著影响.
结论:
- 微塑料污染改变了沿海盐沼土中挥发性氧化碳的来源和沉降动力学.
- 由MP驱动的土壤物理化学性质和微生物功能基因的变化是控制CHCl3和CHBr3流量的关键机制.
- 这项研究强调了微塑料污染对大气化学和土壤生物地球化学循环的潜在环境危害.
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