Abstract
To study the chemical weathering of the water source area of Central Guizhou water control project(CGWCP), a hydrological year observational study was carried out during May 2010 to Jane 2011 in the Yangchang hydrological station section in the Sancha River basin,in which the output fluxes and its weathering modules of the total dissolved substances(TDS) and dissolved inorganic carbon (DIC) were analyzed quantitatively.The results showed that :the weathering modules were 9.771×107g.km-2.a-1 of TDS and 7.996×106g.km-2.a-1 of DIC respectively with notely seasonal variation that 93.1% of TDS fluxes and 92.8% of DIC fluxes were output during the high temperature and rainy season from June to November 2010,as well as showing a striking decreasing trends from Sumer(6~8), Fall(9~11), Spring(3~5) to Winter(12~2).Chemical weathering modules demonstrated that significant seasonal variation of thermal and rainy conditions striking impacted karst processes had been closely related to characteristics of the watershed land surface, climatic, as well as hydrological processes.
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