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Chemical Denudation Rate in Typical Humid Subtropical Dolomite Catchments: A Case Study in the Huangzhou River Basin, Shibing, Guizhou (Vol.46, No.3) TEXT SIZE: A A A

HE Jianghu1, XIAO Shizhen1,3, ZENG Cheng2, DI Yongning1, LIU Mengxing4,LAN Jiacheng1, XIAO Hua1,ZHU Hui2,CENG Qingrui2

(1.School of Karst Science, Guizhou Normal University State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China;
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
3.School of Geographical Science, Southwest University, Chongqing 400715, China;
4. school of geography and Environmental Sciences, Guizhou Normal University, Guiyang 550001, China)

Abstract: The insufficient researches on the karst process of dolomite and the chemical denudation rate throttled the comprehensive understanding of the ecological environment evolution of dolomite areas. This study chose the Huangzhou River Basin, a typical dolomite basin in the World Natural Heritage of South China Karst, Shibing, as the study area, collected and reported the monthly mean concentrations and high time-resolution discharge data of calcium and magnesium in rivers from March, 2015 to March, 2016. The chemical denudation rate of the basin was estimated as 46.91 mm?ka-1 on assuming chemostatic behaviors in this dolomite catchment. The denudation value is roughly equivalent to those of other dolomite basins under similar climate, but higher than those of limestone basins. It can be concluded that the water-dolomite interaction reaches equilibrium in the scale of typical subtropical catchment, consequently, the high solubility of dolomite plays a key role in controlling the dolomite chemical denudation rate.

Keywords: Dolomite; Chemical denudation rate; Solute load method; Subtropics; Shibing, Guizhou

EARTH AND ENVIRONMENT Vol.46, No.3, Tot No.323, 2018, Page 274-281

 

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