重新评估在建造湿地中生物碳排放的温室效应

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Liping Hu¹, Ziqian Li¹, Lingwei Kong²

¹Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China.

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概括

建筑湿地可以排放温室气体,但它们的净影响往往被高估. 这项研究量化了二氧化碳等效 (CO2-eq) 变化,揭示了CW的贡献比以前认为的要小.

科学领域:

环境科学环境科学
生物地质化学生物地质化学
湿地生态学湿地生态学

背景情况:

在有机污染物降解过程中,建筑湿地 (CWs) 的生物碳排放 (CO2和CH4) 是一个重大的环境问题.
评估这些排放的温室效应是复杂的,因为有机物质来自大气二氧化碳固定的生物源.
直接实地观测可能会在评估CWs的净温室效应时带来不确定性.

研究的目的:

提出并测试一种新的策略,客观地评估CWs中生物源碳排放的温室效应.
通过不同类型的CW,量化二氧化碳等效 (CO2-eq) 变化作为碳循环.
为CWs的生命周期评估提供更准确的基础.

主要方法:

开发了一项新策略,以量化与通过CWs的碳流相关的二氧化碳等价值 (CO2-eq) 变化.
该策略用于分析来自64个文献记录的数据,涵盖各种CW配置.
不同的CW类型 (垂直流,表面流,水平流) 根据它们的CO2eq贡献进行了比较.

主要成果:

建筑湿地确实有助于增加CO2eq,但直接现场观测的总贡献估计为15.6%.
热电流的类型显著影响CO2eq的增加:垂直流热电流 (6.8%) 和表面流热电流 (14.2%) 的贡献低于水平流热电流 (25.7%).
本研究提供了一种更客观的方法来评估CWs的温室气体排放.

结论:

温室气体对温室气体排放有量化影响,但其净贡献受到生物碳循环的缓解.
热电厂的设计是决定二氧化碳等值增加的关键因素,水平流系统的影响最大.
这些发现为提高生命周期评估的准确性和建筑湿地的环境管理提供了宝贵的见解.

关键词:

生物产生的碳排放量相当于二氧化碳的二氧化碳.二氧化碳是二氧化碳中的一种.建造的湿地建造的湿地甲甲是一种

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