以重庆市南川区柏树湾表层岩溶泉溪流为例,沿柏枝溪流程以一定间距监测水体中HCO3-的浓度及其pH、电导率、溶解氧等水化学参数,并初步探究溪流水的脱气效应.结果显示(1)表层岩溶地下水出露地表后,HCO3-浓度沿流程呈现出递减的规律；(2) HCO3-浓度递减的快慢反映了脱气作用的强弱,溪流脱气速率具有“枯水期＞平水期＞丰水期”的特点；(3)暴雨期间由于稀释效应HCO3-浓度递减趋势不明显,但降雨后期,递减又开始逐渐产生；(4)脱气效应在造成溪流水HCO3-浓度减小的同时,也导致电导率(EC)沿柏枝溪流程逐渐降低,而pH值逐渐升高；(5)沿途溶解氧(DO)昼夜变化表明,水生生物作用对脱气作用可能也有一定的影响,但其影响机制还有待进一步的研究.%HCO3 Concentration, pH, conductivity (EC) and dissolved oxygen are monitored with certain space along the downstream of the Baishuwan Spring-the Baizhi Stream, and a preliminary study on the de-gasification of the karst water is conducted in the case study. The results show that (1) there is a decreasing trend in HCO-3concentration along the flow path; (2) the decreasing speed of HCO-3 concentration reflects the speed of degasification and the degassing speed in different season assumes "drought period > normal period > rainy period"; (3) dilution effect of the rain water makes the decreasing trend unobvious, but after the rainfall, it starts to present a decreasing trend again; (4) degasification also causes the conductivity (EC) decline along the flow path, but pH values increase; (5)diurnal variation in dissolved oxygen (DO) along the flow path shows that theaquatic organism may have some influences on the degasification, but the influencing mechanism still needs further study.
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