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引用本文:李哲,张呈,刘靓,郭劲松,方芳,陈永柏.三峡水库澎溪河CO2、CH4气泡释放通量初探.湖泊科学,2014,26(5):789-798. DOI:10.18307/2014.0518
LI Zhe,ZHANG Cheng,LIU Liang,GUO Jinsong,FANG Fang,CHEN Yongbo.Ebullition fluxes of CO2 and CH4 in Pengxi River, Three Gorges Reservoir. J. Lake Sci.2014,26(5):789-798. DOI:10.18307/2014.0518
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三峡水库澎溪河CO2、CH4气泡释放通量初探
李哲1,2, 张呈3, 刘靓3, 郭劲松1, 方芳3, 陈永柏2
1.中国科学院重庆绿色智能技术研究院, 重庆 400030;2.中国长江三峡集团公司, 北京 100038;3.重庆大学城市建设与环境工程学院, 重庆 400044
摘要:
气泡释放是天然水体中水-气交换的重要途径之一.采用改进的倒置漏斗型气泡通量监测装置于2012年3 8月期间对三峡支流澎溪河高阳平湖库湾水域进行气泡释放通量的监测研究.研究期间,研究水域CH4气泡释放通量变化范围为0.01~23288.64μmol/(m2·d);CO2气泡释放通量变化范围为0~799.89μmol/(m2·d).不同常规采样点CH4、CO2气泡释放通量均呈现出高度的时空异质性特征.但CH4气泡释放通量显著高于CO2气泡释放通量,且二者释放过程具有同步性.同国外已有水库监测结果相比,澎溪河回水区高阳平湖库湾水域CH4、CO2气泡释放通量位于中等水平.CH4气泡释放通量约为同期CH4扩散通量的0~1893.90%,超量释放下CH4气泡释放通量可达同水域CH4扩散通量的6270.5%±390.0%.CO2气泡释放通量仅占同期扩散通量绝对值的0~21.74‰,超量释放下,CO2气泡释放通量亦仅为同期扩散通量绝对值的40.33‰±0.93‰.CH4气泡释放通量在支流库湾水域对总通量的贡献不可忽视.
关键词:  三峡水库  澎溪河  高阳平湖  CO2  CH4  气泡释放通量
DOI:10.18307/2014.0518
分类号:
基金项目:国家自然科学基金项目(51179215);中国科学院西部行动计划项目(KZCX2-XB3-14);国家水体污染控制与治理科技重大专项项目(2014ZX07104-006-02)联合资助
Ebullition fluxes of CO2 and CH4 in Pengxi River, Three Gorges Reservoir
LI Zhe1,2, ZHANG Cheng3, LIU Liang3, GUO Jinsong1, FANG Fang3, CHEN Yongbo2
1.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400030, P. R. China;2.China Three Gorges Corporation, Beijing 100038, P. R. China;3.Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, P. R. China
Abstract:
Ebullitions of CH4 and CO2 from sediments to water surface are one of the critical pathways of greenhouse gas emission in natural water bodies. Modified gas collecting funnels were applied to collect CH4 and CO2 ebullition and estimate their emission fluxes at an embayment in Lake Gaoyang, Pengxi River, in the Three Gorges Reservoir. From March to August, 2012, ebullition emission fluxes of CH4 were 0.01-23288.64 μmol/(m2·d), while that of CO2 were 0-799.89 μmol/(m2·d). Significant spatial-temporal heterogeneities were detected. Generally, ebullition emission fluxes of CH4 were much higher than that of CO2. Correlation analysis indicated that ebullition emissions of both CH4 and CO2 were simultaneously. Comparing with the global datasets, CH4 and CO2 ebullition emission fluxes in this area were in the middle level. Comparing with the air-water diffusive fluxes monitored simultaneously, CH4 ebullition fluxes were about 0-1893.90% of those of diffusive fluxes. In excess ebullition situation, this ratio could go up to 6270.5% ± 390.0%; CO2 ebullition fluxes about 0-21.74‰ and up to 40.33‰ ± 0.93‰. It can be concluded that CH4 ebullition fluxes should not be neglected in evaluation of the total emission fluxes in this area.
Key words:  Three Gorges Reservoir  Pengxi River  Lake Gaoyang  CO2  CH4  ebullition fluxes
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