Diatoms modify the relationship between dissolved silicon and bicarbonate in impounded rivers | |
Baoli WANG; Cong-Qiang LIU; Fushun WANG; Benjamin CHETELAT; Stephen C. MABERLY | |
2013 | |
发表期刊 | Journal of Limnology |
卷号 | 72期号:3页码:494-504 |
摘要 | In order to investigate the relationship between dissolved silicon (DSi) and bicarbonate (HCO3 – ), we analysed water samples from the main Changjiang channel and its main tributaries in August 2006 and, during 2007-2009, the contrasting tributaries Wujiang (WJ) – mainly dominated by carbonate weathering, and Ganjiang – mainly dominated by silicate weathering. The DSi:HCO3 – ratio ranged from 0 to 0.67, which is in agreement with mixing between the weathering of carbonate or silicate. A negative correlation between DSi and HCO3 – was observed and interpreted as the imprint of regional geology on water chemistry. This relationship and the DSi:HCO3 – ratios illustrate the predominant role of carbonate weathering on the riverine HCO3 – , even for catchments where silicate rocks are dominant. In contrast, a cascade of dams in WJ tributary influenced the concentrations of DSi and HCO3 – and resulted in a positive correlation between DSi and HCO3 – . This is because reservoirs allowed populations of diatoms to develop and diatoms stoichiometrically sequestered DSi and HCO3 – causing a negative feedback regulation on the DSi:HCO3 – ratio. Our study demonstrates that the relationship between DSi and HCO3 – can reflect not only their geological background but also the influence of algal activity (diatom uptake) within rivers. |
关键词 | Chemical Weathering Dam Effect Diatoms Negative Regulation Changjiang River |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/11041 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guanshui Road 46, 550002 Guiyang 2.Institute of Applied Radiation, School of Environmental and Chemical Engineering, Shanghai University, Shangda Road 99, 201800 Shanghai, China 3.Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, LA1 4AP Bailrigg, UK |
推荐引用方式 GB/T 7714 | Baoli WANG;Cong-Qiang LIU;Fushun WANG;Benjamin CHETELAT;Stephen C. MABERLY. Diatoms modify the relationship between dissolved silicon and bicarbonate in impounded rivers[J]. Journal of Limnology,2013,72(3):494-504. |
APA | Baoli WANG;Cong-Qiang LIU;Fushun WANG;Benjamin CHETELAT;Stephen C. MABERLY.(2013).Diatoms modify the relationship between dissolved silicon and bicarbonate in impounded rivers.Journal of Limnology,72(3),494-504. |
MLA | Baoli WANG;Cong-Qiang LIU;Fushun WANG;Benjamin CHETELAT;Stephen C. MABERLY."Diatoms modify the relationship between dissolved silicon and bicarbonate in impounded rivers".Journal of Limnology 72.3(2013):494-504. |
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