中文摘要：

采用受控试验和模拟酸雨试验,研究不同酸雨浓度处理下（pH值分别为2.5、4.0、5.6）细叶青冈幼苗叶片叶绿素荧光参数的差异.结果表明：在不同酸雨浓度处理下,细叶青冈幼苗叶片叶绿素光系统Ⅱ（PSⅡ）最大光化学效率（Fv/Fm）、PSⅡ潜在光化学活性（Fq/Fo）等叶绿素荧光参数变化趋势较为一致,均随着酸雨浓度增加而升高,在重度酸雨（pH 2.5）条件下达到最大值；随着处理时间延长,各处理的光化学量子产额（Yield）也呈现相同的变化趋势.酸雨浓度增加并没有对细 叶青冈幼苗叶片的光系统活性造成损伤,反而推动其光合电子传递,增加光能利用效率,促进光合作用,表明细叶青冈对酸雨有较强的适应能力.

英文摘要：

The controlled experiment and simulated acid rain stress were conducted to investigate the difference in chlorophyll fluorescence parameters of Cyclobalanopsis myrsinaefolia seedlings, a common arbor plant widely distributed in subtropical aras of China, in different concentrations （pH values were 2.5,4.0, 5.6, respectively）. The results showed that after 2 years of simulated acid rain stress （pH 2.5, 4.0, 5.6）, the maximal photochemical activity of photosystem Ⅱ （Fv/Fm）, the potential photochemical activity of PS Ⅱ （Fv/Fo）, and the photochemical quantum yield of photosystem Ⅱ （Yield） increased with decreasing pH value. The maximum value appeared under the condition of pH 2.5. The activity of optical system of C. myrsinaefolia was not damaged by acid rain stress, instead, it was promoted. It suggests that C. myrsinaefolia has high adaptability under acid rain stress.