Chemical weathering inferred from riverine water chemistry in the lower Xijiang basin, South China

The Science of the Total Environment
Huiguo SunXixi Lu

Abstract

Seasonal sampling was conducted on 13 sites involving the lower stem of the Xijiang river and its three tributaries to determine the spatial patterns of the riverine water chemistry and to quantify the chemical weathering rates of carbonate and silicate of the bedrock. Results indicate that the major ions in the Xijiang river system are dominated by Ca(2+) and HCO(3)(-) with a higher concentration of total dissolved solids, characteristic of the drainages developed on typical carbonate regions. Obvious spatial variations of major ion concentrations are found at various spatial scales, which are dominantly controlled by the lithology particularly carbonate distribution in the region. The four selected rivers show similar seasonal variations in major ions, with lower concentrations during the rainy season. Runoff is the first important factor for controlling the weathering rate in the basin, although increasing temperature and duration of water-rock interaction could make positive contributions to the enhancement of chemical weathering. The chemical weathering rates range from 52.6 to 73.7 t/km(2)/yr within the lower Xijiang basin and carbonate weathering is over one order of magnitude higher than that of silicates. CO(2) consump...Continue Reading

References

Jan 20, 2004·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Michel Meybeck
Dec 4, 1970·Science·R J Gibbs

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Citations

Sep 25, 2017·Environmental Science and Pollution Research International·Juma R SelemaniSonali Pradhan
Apr 17, 2019·Proceedings of the National Academy of Sciences of the United States of America·Shilei LiJun Chen
Sep 5, 2020·Environmental Science and Pollution Research International·Faradiella Mohd KusinShamshuddin Jusop
Jun 17, 2019·Environmental Science and Pollution Research International·Fan ZhangDeliang Chen
Sep 11, 2019·Environmental Science and Pollution Research International·Ping'an SunCheng Zhang
Jan 25, 2021·Environmental Science and Pollution Research International·Ramesh RamyaPriya, Lakshmanan Elango
Feb 13, 2021·The Science of the Total Environment·Xin LiuYibo Ding

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