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Daily samples of stream water were continuously collected for solute analysis at three sections in the headwater basin of the rmqi River from April 30 to June 8, 1997. Solute data for chemographs showed that ionic pulse occurred in stream water at G1 and DC Sections, having a weak impact on solute concentrations of BS Section. Hydrological separation using reactive dissolved silica as a tracer demonstrated that soil-restored water or subsurface water occupied approximately 39.6%, 69.9% and 77.1% of the total discharges at G1, DC and BS Sections, respectively. However, low runoff and subsurface water proportion at the glacial basin didn′t mean lower exports of some solute in stream water. High denudation rates derived from glacial comminution for pyrite, gypsum and biotite made the concentrations of K + and SO 2- 4 in stream water at G1 Section several times those at DC and BS Sections. Dissolution of pyrite might produce extra H +, while dissolution of carbonate and gypsum might largely consume H +, resulting in stream water not to be finally sensitive to acidification.
Daily samples of stream water were continuously collected for solute analysis at three sections in the headwater basin of the rmqi River from April 30 to June 8, 1997. Solute data for chemographs showed that ionic pulses occurred in stream water at G1 and DC Sections, having a weak impact on solute concentrations of BS Section. Hydrological separation using reactive dissolved silica as a tracer demonstrated that soil-restored water or subsurface water occupation approximately 39.6%, 69.9% and 77.1% of the total discharges at G1, DC and BS Sections, respectively. However, low runoff and subsurface water proportion at the glacial basin did not mean lower exports of some solute in stream water. High denudation rates derived from glacial comminution for pyrite, gypsum and biotite made the concentrations of K + and SO 2- 4 in stream water at G1 Section several times those at DC and BS Sections. Dissolution of pyrite might produce extra H +, while dissolution of carbonate and gypsum might substantial consume H +, resulting in stream water not to be finally sensitive to acidification.