红树林沉积物中的微塑料老化和塑层相继:机制,微生物相互作用和降解潜力
Yuanyuan Su1, Jun Lei1, Xiaoping Diao2
1State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China; School of Ecology, Hainan University, Haikou 570228, China.
Journal of hazardous materials
|October 16, 2025
概括
可生物降解的微塑料 (BMP) 的衰老速度更快,在红树林中比传统的微塑料 (CMP) 构成更高的风险. 微生物群落和环境因素共同推动微塑料的衰老,无氧条件加快了这一过程.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 聚合物科学 聚合物科学
背景情况:
- 红树林沉积物呈现独特的有氧-无氧条件交替,创造了微塑料 (MP) 衰老的热点.
- 了解传统MP (CMP) 和可生物降解MP (BMP) 的老化过程对于评估它们的环境命运至关重要.
研究的目的:
- 在红树林条件下研究CMP (mPP,mPE) 和BMP (mPLA,mPBAT) 的衰老特征.
- 分析塑圈社区的时空继承及其在MP衰老中的作用.
- 确定影响红树林生态系统中MP衰老的关键驱动因素 (生物和非生物).
主要方法:
- 在三个红树林地区对超过1,3个月和6个月老化的MP进行系统调查.
- 使用微生物网络分析分析塑层社区的继承.
- 应用部分最小平方路径建模 (PLS-PM) 来识别控制MP衰老的因素.
主要成果:
- 随着塑层的继承,MP老化增加,老化的严重程度在mPLA>mPBAT>mPP>mPE之后.
- 与CMP相比,BMP显示重金属出和二次MP释放的风险更高.
- 地理位置是微生物社区结构的主要驱动因素,其次是MP类型和时间.
- 交替的有氧-无氧条件促进了积极的微生物相关性,而无氧MP降解剂与衰老指标的相关性更强.
结论:
- MP老化受到塑层的继承和环境条件的显著影响,特别是交替的有氧-无氧循环.
- 由于加快老化,重金属漏和二次MP释放,BMPs具有较高的环境风险.
- 生物和非生物因素共同控制MP衰老,微生物群落,特别是无氧降解剂,发挥着关键作用.
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