Chemical Weathering Processes and Its Atmospherical CO2 Consumption of the Bainihe Watershed in Wujiang River Source Drainage Basins Area
JIAO Shulin1, LIANG Hong1, DING Rong2
1. School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550001, China;2. Liupanshui Hydrographic and Water Resources Survey Bureau, Liupanshui 553000, Guizhou Province, China
Abstract：For understanding the law on the atmospherical CO2 consumption effect due to Dissolved Inorganic Carbon (DIC) discharged from the chemical weathering processes in the Source Drainage Basins Area of the Karst region, a riverine hydro-chemical investigation is carried out during the entire hydrologic year from June 2010 to May 2011 in the water channel of the Xiangyang Hydrological Stations located at the Bainihe watershed in Wujiang River Source Drainage Basins Area, that the cover layer is mainly carbonate as well as Karst landforms are widely developed. The variation of the Total Dissolved Substances (TDS), its sink flux to atmospherical carbon, and intensity change in the cross-section studied are analyzed. Result indicates that the annual fluxes on the TDS are amount of 6.37×1010g with 7.495×107g·km-2·a-1 in chemical weathering modulus, and the annual fluxes of the DIC are amount of 5.483×108mol with 6.45×105mol·km-2·a-1 in DIC weathering modulus. Based on the carbonate weathering contribution rate amounting to 98% of the riverine DIC, the annual fluxes of the atmospherical CO2 consumption at Xiangyang Hydrological Stations of the Bainihe watershed are about 2.819×108mol with 3.32×105mol·km-2·a-1in modulus, about 95% of which are discharged during the hot-rainy period from June to November in the year surveyed. Impacted strongly by Karst process, the chemical weathering and its carbon consumption are closely related to the characteristics of watershed land surface, climatic condition, as well as hydrological processes in the Bainihe watershed.
焦树林;梁虹;丁蓉. 乌江源区白泥河流域化学风化过程及其碳汇效应研究[J]. , 2012, 30(28-29): 89-93.
JIAO Shulin;LIANG Hong;DING Rong. Chemical Weathering Processes and Its Atmospherical CO2 Consumption of the Bainihe Watershed in Wujiang River Source Drainage Basins Area. , 2012, 30(28-29): 89-93.