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微塑料对土壤碳矿化的影响:氧气动力学和电子转移的关键作用

Jia Shi¹, Zi Wang¹, Yumei Peng¹

¹Key Laboratory of Arable Land Conservation (North China), College of Land Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China.

Environmental science & technology

|August 30, 2023

概括

微塑料通过增加二氧化碳 (CO2) 排放和减少甲 (CH4) 生产,显著改变土壤有机物 (SOM) 分解,影响土壤碳动态.

科学领域:

环境科学环境科学
土壤科学土壤科学
生态毒理学生态毒理学

背景情况:

微塑料污染是陆地生态系统日益关注的问题.
微塑料对土壤有机物 (SOM) 动态的影响尚未完全理解.
微塑料影响土壤碳循环的机制需要进一步研究.

研究的目的:

研究聚乙烯和聚乳酸微塑料对SOM矿化的影响.
量化微塑料修改土壤中二氧化碳 (CO2) 和甲 (CH4) 生产的变化.
阐明微塑料影响的微尺度机制,包括氧气异质性和溶解有机物 (DOM) 变化.

主要方法:

用不同类型的微塑料进行了矿化化实验.
对二氧化碳 (CO2) 和甲 (CH4) 排放进行了监测.
使用平面光学传感器评估了氧 (O2) 微环境.
用光谱方法和超高分辨率质谱分析了土壤溶解有机物 (DOM).

主要成果:

微塑料导致累计二氧化碳排放增加160-613%.
在微塑料的存在下,甲 (CH4) 排放量减少了45-503%.
微塑料改变了土壤DOM成分,增加了极性,并表明了增强的电子传输,与二氧化碳排放正相关.

结论:

微塑料显著增强了土壤有机物 (SOM) 矿化.
改变氧气微环境和改变溶解有机物 (DOM) 特性是关键机制.
微塑料在调节土壤碳动态和温室气体流量方面发挥着至关重要的作用.

关键词:

DOM分子组成的分子组成.这是一个PARAFAC模型.电子捐赠能力的电子捐赠能力.温室气体排放量排放量温室气体排放量排放量微塑料微塑料的使用一个平面的 optode.

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