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使用溶解有机物质的潜在转变来了解内陆河流的碳排放

Qian Qu¹, Xiangang Hu¹, Ruihong Feng¹

¹Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), Carbon Neutrality Interdisciplinary Science Centre, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.

Environmental science & technology

|July 30, 2024

概括

温室气体 (GHG) 排放在城市周边的河流中高于城市河流,这是由溶解有机物 (DOM) 转化和微生物活动所驱动的. 了解DOM变化是管理内水温室气体排放的关键.

科学领域:

环境科学环境科学
生物地质化学生物地质化学
水的质量水的质量

背景情况:

评估内陆水温室气体 (GHG) 排放需要了解河流溶解有机物 (DOM) 的转化.
DOM组件变化与温室气体排放之间的具体联系尚不清楚.

研究的目的:

通过并行因子分析 (PARAFAC) 调查中国内陆河流中的DOM组件.
探索DOM变异,微生物和环境因素以及温室气体排放之间的关系.
量化微生物介导的DOM生产和降解,并比较城市和郊区河流之间的碳排放潜力.

主要方法:

平行因子分析 (PARAFAC) 用于描述DOM组件.
组合数据主要组件分析 (CoDA-PCA) 用于分析DOM变异关系.
微生物介导的DOM生产和降解的量化.
对影响温室气体排放的微生物和环境因素的分析.

主要成果:

与城市河流相比,城市周边河流的温室气体排放量是城市河流的1.102.15倍.
微生物和环境因素解释了70%以上的河流温室气体排放差异.
城市周边河流的DOM退化水平比城市河流高11.825.2%.
包括NH4-N和As在内的水化学影响了碳排放潜力.

结论:

DOM组成的变化和转变显著调节河流中的温室气体排放.
微生物活动和DOM降解是城市和郊区河流系统碳排放潜力的差异的关键驱动因素.
这项研究提高了对DOM生物地球化学循环及其对内水温室气体排放的影响的理解.

关键词:

碳循环中的碳循环.溶解的有机物质是一种有机物质.内陆河流内陆河流转化转化转化转化转化转化转化转化差异差异是指差异的差异.

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What are Biogeochemical Cycles?

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