Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.scitotenv.2008.12.036
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dc.titleMajor ion chemistry and dissolved inorganic carbon cycling in a human-disturbed mountainous river (the Luodingjiang River) of the Zhujiang (Pearl River), China
dc.contributor.authorZhang, S.
dc.contributor.authorLu, X.X.
dc.contributor.authorHiggitt, D.L.
dc.contributor.authorSun, H.
dc.contributor.authorHan, J.
dc.date.accessioned2011-02-23T06:11:24Z
dc.date.available2011-02-23T06:11:24Z
dc.date.issued2009
dc.identifier.citationZhang, S., Lu, X.X., Higgitt, D.L., Sun, H., Han, J. (2009). Major ion chemistry and dissolved inorganic carbon cycling in a human-disturbed mountainous river (the Luodingjiang River) of the Zhujiang (Pearl River), China. Science of the Total Environment 407 (8) : 2796-2807. ScholarBank@NUS Repository. https://doi.org/10.1016/j.scitotenv.2008.12.036
dc.identifier.issn00489697
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/19663
dc.description.abstractMajor ion chemistry and dissolved inorganic carbon system (DIC, mainly HCO3- and gaseous CO2) in the Luodingjiang River, a mountainous tributary of the Zhujiang (Pearl River), China, were examined based on a seasonal and spatial sampling scheme in 2005. The diverse distribution of lithology and anthropogenic impacts in the river basin provided the basic idea to assess the effects of lithology vs. human activities on water chemistry and carbon biogeochemistry in river systems. Major ions showed great spatial variations, with higher concentrations of total dissolved solids (TDS) and DIC in the regions with carbonate rocks and clastic sedimentary rocks, while lower in the regions with metamorphic sandstones and schists as well as granites. pCO2 at all sampling sites was oversaturated in June, ranging with a factor from 1.6 to 18.8 of the atmospheric concentration, reflecting the enhanced contribution from baseflow and interflow influx as well as in situ oxidation of organic matter. However, in April and December, undersaturated pCO2 was found in some shallow, clean rivers in the upstream regions. δ13C of DIC has a narrow range from - 9.07 to - 13.59‰, which was more depleted in the regions with metamorphic rocks and granites than in the carbonate regions. Seasonally, it was slightly more depleted in the dry season (December) than in the wet season (June). The results suggested that lithological variability had a dominant control on spatial variations of water chemistry and carbon geochemistry in river systems. Besides, anthropogenic activities, such as agricultural and urban activities and in-stream damming, as well as river physical properties, such as water depth and transparency, also indicated their impacts. The seasonal variations likely reflected the changes of hydrological regime, as well as metabolic processes in the river. © 2008 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.scitotenv.2008.12.036
dc.sourceScopus
dc.subjectDissolved inorganic carbon
dc.subjectHuman impacts
dc.subjectMajor ions
dc.subjectStable carbon isotope
dc.subjectWater chemistry
dc.subjectZhujiang (Pearl River)
dc.typeArticle
dc.contributor.departmentGEOGRAPHY
dc.description.doi10.1016/j.scitotenv.2008.12.036
dc.description.sourcetitleScience of the Total Environment
dc.description.volume407
dc.description.issue8
dc.description.page2796-2807
dc.description.codenSTEVA
dc.identifier.isiut000264922000035
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