摘要
以三峡库区库中干流以及主要支流——梅溪河为研究区，于2013年5月对该区域水体中溶解二氧化碳分压（pCO2）进行了走航观测．结果表明，夏季梅溪河表层pCO，为6．8-7．5Pa，三峡库区库中长江干流表层pCO，为201．4-210．2Pa．在库区干、支流交汇的过渡区水体剖面上，表层水休pCO：最低为53．5Pa，随着水深增加，pCO：急剧增大，在3m处达到约210Pa后基本保持不变．通过计算，库区支流梅溪河和库区干流表层水体的CO，释放通量分别为-7．48mmol·（m2·d）-1和39．58mmol·（m2·d）-1．结果表明，库区支流梅溪河表现为大气中CO，的“汇”，而库区干流表现为CO2的“源”，库区于、支流水体在CO，的释放上有显著差异．
This study investigated the partial pressure of CO2 （pCO2 ） in the mainstream of the Three Gorges Reservoir and its tributary （Meixi River） in May 2013. Results showed that pCO2 in the surface water of the Meixi River and mainstream of the Three Gorges Reservoir was 6.8-7.5 Pa and 201.4-210.2 Pa, respectively. At the mixing area between the Meixi River and the mainstream of Changjiang, the lowest value ofpCO2 in surfaee water was 53.5 Pa, and pCO2 gradually increased downwardly. Below 3 m in depth, pCO2 kept the stable value of around 210 Pa. Based on the calculation results, the emission flux of CO2 in the Meixi River and the mainstream of the central Three Gorges Reservoir was about - 7.48 retool. （ m2 . d） -1 and 39.58 retool. （ m2.d） -1 , respeetively. These results showed that the Meixi River is a sink for atmospheric CO2 , and the mainstream of the Three Gorges Reservoir is a source for atmospherie CO2.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2014年第3期885-891,共7页
Environmental Science
基金
国家水体污染控制与治理科技重大专项(2012ZX07104-001)
国家自然科学基金项目(42173128)
上海市教委基金项目(12YZ017)
关键词
温室气体
二氧化碳分压
二氧化碳通量
三峡库区
梅溪河
greenhouse gas
partial pressure of carbon dioxide
diffhsion flux of carbon dioxide
the Three Gorges Reservoir
Meixi River
