| 城市河流CH4和N2O产生及排放研究进展 |
| 摘要点击 1743 全文点击 378 投稿时间：2023-08-07 修订日期：2023-11-23 |
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| 中文关键词 城市河流 碳排放 甲烷（CH4） 氧化亚氮（N2O） 时空特征 产排机制 影响因素 |
| 英文关键词 urban rivers carbon emission methane（CH4） nitrous oxide（N2O） spatiotemporal characteristics production and emission mechanisms influencing factors |
| 作者 | 单位 | E-mail | | 李轩 | 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084 | lixuan21@mails.tsinghua.edu.cn | | 苑心 | 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084 | | | 门聪 | 北京科技大学能源与环境工程学院, 工业典型污染物资源化处理北京市重点实验室, 北京 100083 | | | 杨静怡 | 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084 | | | 左剑恶 | 清华大学环境学院, 环境模拟与污染控制国家重点联合实验室, 北京 100084
清华大学深圳国际研究生院, 深圳 518055 | |
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| 中文摘要 |
| 甲烷（CH4）和氧化亚氮（N2O）是备受关注的温室气体.近年来,城市河流已经成为不可忽视的CH4和N2O排放源,亟需予以关注.探究城市河流CH4和N2O产生及排放的时空特征、机制和影响因素对城市碳减排具有重要意义.通过梳理近20年国内外文献关于城市河流CH4和N2O溶存浓度与排放通量实测数据,总结了当前城市河流CH4和N2O排放的时空特征；估算得到2018年北京市城市河流的CH4和N2O排放量（以CO2-eq计）分别为234.63 Gg和59.53 Gg,估算得到2018年上海市城市河流的CH4和N2O排放量（以CO2-eq计）分别为159.86 Gg和260.24 Gg,表明城市河流是不容忽视的CH4和N2O排放源；整理了城市河流中CH4和N2O的产生/消耗过程与输入/输出过程；从河流内部理化性质、河流外部水文及植被条件、城市化进程的角度,分析了城市河流CH4和N2O产生与排放过程的主要影响因素；最后提出了城市河流CH4和N2O排放核算与减排的未来研究重点,为今后城市河流的温室气体减排提供理论支持. |
| 英文摘要 |
| Methane （CH4） and nitrous oxide （N2O） are concerning greenhouse gases. Urban rivers have been important emission sources of CH4 and N2O in recent years. It is meaningful for city greenhouse gas reduction to provide a systematic analysis of spatiotemporal characteristics, mechanisms, and influencing factors of the production and emission of CH4 and N2O from urban rivers. This study combed measured data of urban river CH4 and N2O dissolution concentrations and emission fluxes from related literature published in the past 20 years and also concluded the spatiotemporal characteristics of urban river CH4 and N2O emissions. This study estimated that CH4 and N2O emissions （expressed by CO2-eq） from urban rivers in Beijing were 234.63 and 59.53 Gg CO2-eq in 2018, whereas CH4 and N2O emissions （expressed by CO2-eq） from urban rivers in Shanghai were 159.86 and 260.24 Gg CO2-eq in 2018, respectively. These results demonstrated that urban rivers have become important CH4 and N2O emission sources. This study summarized the production/consumption processes and import/export pathways of CH4 and N2O in urban rivers. What is more, this study discussed the main influencing factors of urban river CH4 and N2O production and emissions from the perspectives of river environmental conditions and urbanization effects. At last, the present work prospected the future research trends of urban river CH4 and N2O emissions and provides urban rivers with scientific support for greenhouse gas reduction. |
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