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学科主题: Geography, Physical; Geology; Geosciences, Multidisciplinary
题名: Chemical weathering and CO2 consumption in the Xijiang River basin, South China
作者: Gao, QZ ; Tao, Z ; Huang, XK ; Nan, L ; Yu, KF ; Wang, ZG
通讯作者: eesgqz@mail.sysu.edu.cn
关键词: Chemical weathering ; CO2 consumption ; Riverine ion ; Catastrophic flood ; The Xijiang River basin
刊名: GEOMORPHOLOGY
发表日期: 2009
卷: 106, 期:40606, 页:324-332
收录类别: sci
部门归属: [Gao, Quanzhou; Tao, Zhen; Wang, Zhengang] Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou 510275, Guangdong, Peoples R China; [Gao, Quanzhou; Yu, Kefu] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Huang, Xiakun] Hohai Univ, Nanjing 210098, Peoples R China; [Huang, Xiakun] Guangxi Reg Hydrol & Water Resources Bur, Wuzhou Branch, Wuzhou 543002, Peoples R China; [Nan, Ling] Shenzhen Geotech Invest & Surveying Co Ltd, Shenzhen 518028, Peoples R China
项目归属: 海洋地质
摘要: Monthly samples of riverine water were collected and analyzed for the concentrations of major ions (Ca2+, Mg2+, K+, Na+, HCO3-, SO42-, Cl-, NO3-), dissolved silicon, and total dissolved solids (TDS) at Wuzhou hydrological station located between the middle and lower reaches of the Xijiang River (XJR) from March 2005 to April 2006. More frequent sampling and analysis were carried out during the catastrophic flooding in June 2005. Stoichiometric analysis was applied for tracing sources of major ions and estimating CO2 consumption from the chemical weathering of rocks. The results demonstrate that the chemical weathering of carbonate and silicate rocks within the drainage basin is the main source of the dissolved chemical substances in the XJR. Some 81.20% of the riverine cations originated from the chemical weathering processes induced by carbonic acid, 11.32% by sulfuric acid, and the other 7.48% from the dissolution of gypsum and precipitates of sea salts within the drainage basin. The CO2 flux consumed by the rock chemical weathering within the XJR basin is 2.37 x 10(11) mol y(-1), of which 0.64 x 10(11) mol y(-1) results from silicate rock chemical weathering, and 1.73 x 10(11) mol y(-1) results from carbonate rock chemical weathering. The CO2 consumption comprises 0.38 x 10(11) mol during the 9-d catastrophic flooding. The CO2 consumption from rock chemical weathering in humid subtropical zones regulates atmospheric CO2 level and constitutes a significant part of the global carbon budget. The carbon sink potential of rock chemical weathering processes in the humid subtropical zones deserves extra attention. (C) 2008 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000265343700016
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4628
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Gao, QZ; Tao, Z; Huang, XK; Nan, L; Yu, KF; Wang, ZG.Chemical weathering and CO2 consumption in the Xijiang River basin, South China,GEOMORPHOLOGY,2009,106(40606):324-332
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