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湖泊沉积物中的有机碳分量的微塑料驱动的重构:可生物降解聚合物的矿化和稳定动态

Zequn Fan¹, Yue Yang², Peijun Wang²

¹School of Energy and Environment, Southeast University, Nanjing, 211189, China; College of Hydrology and Water Resources, Hohai University, Nanjing, 210098, China.

|October 29, 2025

概括

可生物降解的微塑料 (PBAT) 作为碳来源,增加温室气体排放并改变沉积物的碳分量. 虽然PBAT最初会破坏碳的稳定性,但最终通过化增强了碳的稳定性,对湖泊生态系统构成风险.

科学领域:

环境科学环境科学
生物地质化学生物地质化学
生态毒理学生态毒理学

背景情况:

众所周知,微塑料 (MP) 在水生环境中破坏碳循环.
生物降解的MPs影响有机碳分数 (OCF) 和温室气体排放的具体机制尚不清楚.
聚乙烯基酸盐-联合甲酸盐 (PBAT) 是一种常见的可生物降解塑料,对湖泊沉积物的生物地质化学有未知的影响.

研究的目的:

研究PBAT和聚乙烯 (PE) MPs如何改变OCF并调节无氧湖泊沉积物中的二氧化碳 (CO2) 和甲 (CH4) 排放.
阐明湖泊生态系统中可生物降解的MPs影响的生物地化学途径.
评估与可生物降解的MPs相关的环境安全和生态风险.

主要方法:

使用无氧湖泊沉积物微观宇宙修改PBAT和PEMP的化实验.
有机碳分数 (OCF) 的分析及其稳定性.
测量二氧化碳 (CO2) 和甲 (CH4) 的排放量.
微生物社区分析和性物质的表征.

主要成果:

通过作为短期碳来源,PBAT显著增加了CO2和CH4排放,丰富了发酵微生物群.
PBAT加速了不稳定的有机碳的分解,最初降低了沉积物碳的稳定性.
尽管最初的不稳定,但PBAT通过增强的化,矿物联结和积来促进碳稳定.

结论:

像PBAT这样的可生物降解MP具有复杂的环境权衡,作为碳来源增加温室气体排放,同时促进长期碳封存.
使用可生物降解的MP挑战了环境安全的假设,因为有重大生物地质化学破坏.
这些发现突出了对碳敏感湖泊生态系统的风险,以及需要在政策中考虑这些碳气候反.

关键词:

碳稳定碳稳定化是指化过程中的一种.湖泊沉积物的沉积物微塑料是一种微塑料.有机碳有机碳是有机碳的组成部分.

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