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选择亚热带常绿阔叶林优势树种青冈幼苗为研究对象,设置3个酸雨处理:pH2.5、pH4.0、pH5.6(CK),研究不同强度的模拟酸雨对青冈幼苗光合特性、叶绿素荧光参数和叶绿素含量的影响.结果表明:经过2年酸雨处理,青冈的净光合速率随着酸雨强度的增加而显著上升.pH2.5、pH4.0处理的酸雨增大了青冈的气孔导度和蒸腾速率,且对pH2.5处理的影响更为显著.胞间CO2浓度的大小顺序是pH2.5>pH5.6>pH4.0.pH2.5、pH4.0处理青冈的最大净光合速率、光补偿点、光饱和点、暗呼吸速率显著高于对照,表观量子效率对酸雨胁迫不敏感.pH2.5、pH4.0处理青冈的PSⅡ原初光能转化效率和PSⅡ的潜在活性显著高于对照.青冈的叶绿素相对含量大小顺序是pH2.5>pH5.6>pH4.0,且pH2.5与pH4.0之间有显著差异.说明青冈幼苗的光合参数、叶绿素荧光参数指标在pH2.5和pH4.0的酸雨处理下有所增加,且在pH2.5强度下增加更为明显.
Three submerged broad-leaved evergreen forest seedlings were selected as research objects. Three acid rain treatments (pH2.5, pH4.0, pH5.6) were set up to study the effects of simulated acid rain on photosynthetic characteristics, chlorophyll fluorescence Parameters and chlorophyll content.The results showed that after 2 years of acid rain treatment, the net photosynthetic rate of Cyclobalanopsis glauca increased significantly with the increase of acid rain intensity.The acid rain with pH 2.5 and pH 4.0 increased the stomatal conductance and Transpiration rate, and the effect of pH2.5 treatment was more significant.The order of the intercellular CO2 concentration was the largest net photosynthetic rate of Cyclobalanopsis glauca with pH2.5> pH5.6> pH4.0.pH2.5, pH4.0, Light compensation point, light saturation point and dark respiration rate were significantly higher than those of the control, and apparent quantum yield was not sensitive to acid rain stress.The primary light energy conversion efficiency and PS Ⅱ potential activity of PSⅡ were significantly higher than that of pH 2.5 treatment The order of chlorophyll relative content of Cyclobalanopsis glauca was pH2.5> pH5.6> pH4.0, and there was a significant difference between pH2.5 and pH4.0, indicating that photosynthetic parameters and chlorophyll fluorescence parameters of Cyclobalanopsis glauca seedlings were at pH2. 5 and pH 4.0 acid rain treatment increased, and increased more strongly at pH 2.5 strength Significantly.