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塑料颗粒驱动流动性和氧化排放:揭示湿地中的微生物Fe-N相互作用

Zhimin Xu¹, Xinyue Wu¹, Zheng Lin¹

¹Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China.

Journal of hazardous materials

|November 20, 2025

概括

城市湿地中的聚烯微塑料 (PP-MP) 通过改变微生物铁循环,增加了氧化 (N2O) 排放和 (Cd) 流动性. 这影响了湿地生态系统中Cd的生物可用性和温室气体的释放.

科学领域:

环境科学环境科学
地质化学地质化学
微生物学微生物学

背景情况:

城市湿地是微塑料 (MP) 和 (Cd) 等污染物的关键接口.
在湿地中,MP和Cd之间的生物地化学相互作用尚未得到充分了解.
了解这些相互作用对于评估生态风险和污染物循环至关重要.

研究的目的:

研究聚烯MPs (PP-MPs) 对 (Cd) 流动性的影响.
评估PP-MPs对湿地土壤中氧化 (N2O) 排放的影响.
阐明驱动这些变化的微生物机制,重点关注铁氧化还原合.

主要方法:

进行了为期两个月的现场土壤柱实验,使用浸水的湿地土壤种植了Acorus calamus.
该研究监测了N2O排放量,并分析了土壤中Cd的不同分数.
分析了微生物社区的组成和关键的功能基因,这些基因参与了脱和铁循环.

主要成果:

PP-MPs显著增加了N2O排放量45%,可交换Cd分数增加了28%.
植物对Cd的摄取量下降了56%,表明植物可用性降低.
微生物群落发生了转移,富含降铁和依赖酸盐的Fe (II) 氧化细菌,改变了Fe-N氧化还原合.

结论:

PP-MPs显著改变湿地土壤中的Cd生物可用性和N2O排放.
这些变化是由PP-MPs诱导的微生物群落的变化和铁氧化还原合介导的.
这些发现突显了湿地生物地化学中的MP被忽视的生态风险,影响了污染物循环和温室气体流.

关键词:

的生物利用性的生物利用性铁气合器铁气合器微生物过程中的微生物过程.微塑料是一种微塑料.氧化排放的排放量是多少

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