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引用本文:郭劲松,蒋滔,李哲,陈永柏,孙志禹.三峡水库澎溪河流域高阳回水区夏季水体CO2分压日变化特性.湖泊科学,2012,24(2):190-196. DOI:10.18307/2012.0204
GUO Jinsong,JIANG Tao,LI Zhe,CHEN Yongbo,SUN Zhiyu.Diurnal variation characteristics of pCO2 in the summer water column of Gaoyang backwater area in Pengxi River, Three Gorges Reservoir. J. Lake Sci.2012,24(2):190-196. DOI:10.18307/2012.0204
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三峡水库澎溪河流域高阳回水区夏季水体CO2分压日变化特性
郭劲松1, 蒋滔1, 李哲1, 陈永柏2, 孙志禹2
1.重庆大学三峡库区生态环境教育部重点实验室, 重庆 400030;2.中国长江三峡集团公司, 宜昌 443000
摘要:
水柱中CO2分压(pCO2)的时空分布在一定程度上可反映水中碳的环境地化特征.本研究在夏季分层期间对三峡水库澎溪河(小江)流域高阳回水区段进行了昼夜连续观测发现,恒定的温跃层中pCO2随水深增加而显著增大,表层0.5 m处pCO2均值为152±71μatm,而在水深10.0 m处pCO2均值为4568±1089μatm,同水温、pH及DO存在明显的负相关关系,进一步分析认为水温等将影响微生物、浮游植物的代谢过程及水气界面对流传输,进而对pCO2分布产生影响.对水气界面CO2扩散通量的估算结果表明,夏季分层期间高阳水域总体上表现为CO2的汇,其对大气CO2的吸收量最大值于15:00左右,达到-0.33 mmol/(m2·h);最弱在次日凌晨3:00左右,吸收量仅为-0.17 mmol/(m2·h).
关键词:  二氧化碳分压  时空分布  水温分层  水-气扩散通量  澎溪河流域  三峡水库  高阳回水区
DOI:10.18307/2012.0204
分类号:
基金项目:国家重点基础研究发展计划"973"项目(2010CB955904-04);中国长江三峡集团公司科研项目(CT-09-08-03);国家自然科学基金青年基金项目(51009155);国家水体污染控制与治理科技重大专项项目(2009ZX07104)联合资助
Diurnal variation characteristics of pCO2 in the summer water column of Gaoyang backwater area in Pengxi River, Three Gorges Reservoir
GUO Jinsong1, JIANG Tao1, LI Zhe1, CHEN Yongbo2, SUN Zhiyu2
1.Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Chongqing University, Chongqing 400030, P. R. China;2.China Three Gorges Corporation, Yichang 443000, P. R. China
Abstract:
Partial pressure of CO2 (pCO2) in water column was an importamt indicator for the geochemical characteristics of carbon. Diel samples for pCO2 and other environmental factors, i. e. pH, DO and water temperature, was taken from Gaoyang backwater area in the Pengxi (Xiaojiang) River, Three Gorges Reservoir in every 6 h. Results showed that in stable metaliminon, vertical pCO2 increased along with the water depth. Mean value of the pCO2 at 0.5 m depth was 152 ± 71 μatm, while that of pCO2 at 10.0 m depth was 4568 ± 1089 μatm. Significant negative correlations between pCO2 and pH, DO, water temperature were detected, indicating metabolism of microbial and planktonic community and penetrative convection were impacted by water temperature that regulated the distribution of pCO2. Estimation of the water-air flux of CO2 indicated that the general characteristic of carbon sink in the Gaoyang backwater area was obvious. A maximum sink flux of -0.33 mmol/(m2·h) was detected in 15:00 while a minimum sink flux of -0.17 mmol/(m2·h) was also detected in 3:00 of the next day.
Key words:  Partial pressure of CO2  spatio-temperal distribution  water column stratification  water-air flux  Pengxi River  Three Gorges Reservoir  Gaoyang backwater area
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