The dissolution rate of dolomite and limestone by acid rain in Guilin is studied. The results showed that the conductivity and pH of dolomite and limestone in acid rain soak solution as a function of time were linear. In the same condition, the dissolution rate of limestone is larger than dolomite, both dissolution rates are in the same order of magnitude. In the open or the closed system, the change trend of the conductivity and pH of dolomite and limestone are similar. But the dissolution rate of limestone is 3 times larger in the open system than that in the closed system. In the same pH, the dissolution rate of limestone in the great rainfall is 3 - 4 times larger than that in the little rainfall. Therefore, the acidity of rain and the rainfall are important factors which influence the dissolution rate.%研究了桂林市酸雨对白云岩和灰岩的溶蚀速率.试验结果表明:白云岩和灰岩在酸雨浸泡液中的电导率和pH总体上随着时间呈线性变化；在同等条件下,灰岩的溶蚀速率比白云岩大,但两者的溶蚀速率在同一数量级上；在开放和封闭系统中,灰岩浸泡液的电导率变化趋势和pH变化趋势基本相似,但开放系统中灰岩的溶蚀速率比封闭系统的大3倍左右；同等pH值条件下,高雨水量时灰岩的溶蚀速率要比低雨水量的大3～4倍,因此,雨水的酸度、降雨量是影响溶蚀速率的重要因素.
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