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Sensitivity of chemical weathering and dissolved carbon dynamics to hydrological conditions in a typical karst river
Jun Zhong;  Si-liang Li;  FaxiangTao;  FujunYue;  Cong-Qiang Liu
2017
Source PublicationScientfic Repotts
Pages309-315
Abstract

To better understand the mechanisms that hydrological conditions control chemical weathering and carbon dynamics in the large rivers, we investigated hydrochemistry and carbon isotopic compositions of dissolved inorganic carbon (DIC) based on high-frequency sampling in the Wujiang River draining the carbonate area in southwestern China. Concentrations of major dissolved solute do not strictly follow the dilution process with increasing discharge, and biogeochemical processes lead to variability in the concentration-discharge relationships. Temporal variations of dissolved solutes are closely related to weathering characteristics and hydrological conditions in the rainy seasons. The concentrations of dissolved carbon and the carbon isotopic compositions vary with discharge changes, suggesting that hydrological conditions and biogeochemical processes control dissolved carbon dynamics. Biological CO2 discharge and intense carbonate weathering by soil CO2 should be responsible for the carbon variability under various hydrological conditions during the high-flow season. The concentration of DICbio (DIC from biological sources) derived from a mixing model increases with increasing discharge, indicating that DICbio influx is the main driver of the chemostatic behaviors of riverine DIC in this typical karst river. The study highlights the sensitivity of chemical weathering and carbon dynamics to hydrological conditions in the riverine system.

KeywordConcentration-discharge Relationships Qinghai-tibet Plateau Inorganic Carbon Co2 Consumption Isotopic Composition Seasonal-changes Southwest China Organic-carbon Fraser-river Basin
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7775
Collection环境地球化学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550001, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
4.Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safet, Tianjin 300072, Peoples R China
First Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Jun Zhong;Si-liang Li;FaxiangTao;FujunYue;Cong-Qiang Liu. Sensitivity of chemical weathering and dissolved carbon dynamics to hydrological conditions in a typical karst river[J]. Scientfic Repotts,2017:309-315.
APA Jun Zhong;Si-liang Li;FaxiangTao;FujunYue;Cong-Qiang Liu.(2017).Sensitivity of chemical weathering and dissolved carbon dynamics to hydrological conditions in a typical karst river.Scientfic Repotts,309-315.
MLA Jun Zhong;Si-liang Li;FaxiangTao;FujunYue;Cong-Qiang Liu."Sensitivity of chemical weathering and dissolved carbon dynamics to hydrological conditions in a typical karst river".Scientfic Repotts (2017):309-315.
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