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Open AccessArticle

Climatic Variabilities Control the Solute Dynamics of Monsoon Karstic River: Approaches from C-Q Relationship, Isotopes, and Model Analysis in the Liujiang River

1
School of Management Science, Guizhou University of Finance and Economic, Guiyang 550025, China
2
State key laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3
Tianjin Key Laboratory of Water Resources and environment, Tianjin Normal University, Tianjin 300387, China
4
School of Public Managemerent, Guizhou University of Finance and Economics, Guiyang 550025, China
5
School of Eco-Environment Engineering, Guizhou Minzu University, Guiyang 550025, China
*
Authors to whom correspondence should be addressed.
Water 2020, 12(3), 862; https://doi.org/10.3390/w12030862
Received: 14 February 2020 / Revised: 14 March 2020 / Accepted: 16 March 2020 / Published: 19 March 2020
The dynamics of riverine solutes’ contents and sources reflect geological, ecological, and climatic information of the draining basin. This study investigated the influence of climatic variability on solute dynamics by the high-frequency hydrogeochemical monitory in the Liujiang River draining karst terrain of Guangxi Province, SW (Southwestern) China. In the study river, the content-discharge (C-Q) patterns of riverine solutes indicate that the majority of riverine solutes show similar dilution and near chemostatic behaviors responding to increasing discharge, especially geogenic solutes (such as weathering products from carbonate, silicate, and sulfide oxidation), whereas exogenous solutes (such as atmospheric input to riverine sulfate) and biological solutes (such as soil CO2) show higher contents with increasing discharge. Besides, the biological carbon is the main driver of the chemostatic behaviors of total dissolved inorganic carbon (DIC). The forward model results show that carbonate weathering dominates the water chemistry, and the weathering rates are intensified during high flow period due to additional inputs of weathering agents, i.e., the biologic carbonic acid from dissolution of soil CO2, indicated by δ13CDIC. In addition, there exists the strong capacity of CO2 consumption that is heavily dependent on climatic variables such as precipitation and air temperature in this study river. Our study highlights the impact of climatic variability on solutes dynamics and chemical weathering and thus must be better addressed in C models under future climate change scenarios. View Full-Text
Keywords: solute–discharge relationship; stable isotopes; chemical weathering; CO2 consumption; climatic variability solute–discharge relationship; stable isotopes; chemical weathering; CO2 consumption; climatic variability
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Liu, J.; Ding, H.; Xiao, M.; Xu, Z.-Y.; Wei, Y.; Su, Z.-H.; Zhao, L.; Peng, J.-T.; Wang, H.; Wang, X.-D. Climatic Variabilities Control the Solute Dynamics of Monsoon Karstic River: Approaches from C-Q Relationship, Isotopes, and Model Analysis in the Liujiang River. Water 2020, 12, 862.

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