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Dynamics Of CO2 partial pressure and CO2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China
Yao, GR; Gao, QZ; Wang, ZG; Huang, XK; He, T; Zhang, YL; Jiao, SL; Ding, J; eesgqz@mail.sysu.edu.cn
2007
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
卷号376期号:40546页码:255-266
摘要The partial pressure of carbon dioxide (pCO(2)) in surface water was surveyed monthly at 6 sampling sites along the entire length of the lower reaches of the Xijiang River, a subtropical monsoon river in China, and at the mouths of its major tributaries, over a whole hydrological year from April 2005 to March 2006, to reveal the seasonal and spatial dynamics of pCO(2). Intensive sampling and measurements were also conducted at Wuzhou gauge station in June and July to investigate the impact of floodwater on pCO(2) and to further explore the relationship between river discharge and pCO(2). The pCO(2) levels were well above atmospheric equilibrium (380 mu atm) during the entire survey period with obvious seasonal and spatial variations, ranging from 600 mu atm to 7200 mu atm for the mainstream and from 700 to 11000 mu atm for tributaries, respectively. The pattern of pCO(2) seasonal variation across 6 sites was almost consistent with each other with little difference. The pCO(2) levels in the dry season were relatively low, with relatively slight temporal and spatial fluctuations that were predominantly controlled by in situ biogenic activities. While the pCO(2) in the wet season greatly varied with river discharge, both annual maximum and minimum pCO(2) levels occurring in this period. The much higher pCO(2) in the early wet season were mainly induced by increasing baseflow and interflow that flushed significant soil CO2 into the streams, whereas the lower pCO(2) observed after floods from July to September, some even lower than pCO(2) levels in the dry season, potentially resulted from in situ plankton blooms. The annual minima pCO(2) levels occurring in this period were caused by the dilution effect of floodwater. There was no obvious downstream trend in pCO(2) variation during the whole survey period, probably a consequence of disturbance from tributaries or spatially distinct channel characteristics and water environments. Based on measurements, we estimate that the water-to-air CO2 flux in the lower reaches of the Xijiang River is about 8.3-15.6 Mg C ha(-1) y(-1). The role of the Xijiang River as a net source of atmospheric CO2 is undoubted. (c) 2007 Elsevier B.V. All rights reserved.
部门归属Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou 510275, Peoples R China; Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China; Guangxi Reg Hydrol & Water Resources Bur, Wuzhou Branch, Wuzhou 543002, Peoples R China; Hohai Univ, Nanjing 210098, Peoples R China
关键词Co2 Seasonal And Spatial Variation Discharge Outgassing The Xijiang River
学科领域Environmental Sciences
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000245776400023
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4496
专题中科院边缘海地质重点实验室
通讯作者eesgqz@mail.sysu.edu.cn
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Yao, GR,Gao, QZ,Wang, ZG,et al. Dynamics Of CO2 partial pressure and CO2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2007,376(40546):255-266.
APA Yao, GR.,Gao, QZ.,Wang, ZG.,Huang, XK.,He, T.,...&eesgqz@mail.sysu.edu.cn.(2007).Dynamics Of CO2 partial pressure and CO2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China.SCIENCE OF THE TOTAL ENVIRONMENT,376(40546),255-266.
MLA Yao, GR,et al."Dynamics Of CO2 partial pressure and CO2 outgassing in the lower reaches of the Xijiang River, a subtropical monsoon river in China".SCIENCE OF THE TOTAL ENVIRONMENT 376.40546(2007):255-266.
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