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以烤烟为供试材料,采用土培盆栽的方法研究了不同pH值的模拟酸雨(pH5.6、pH4.5、pH4.0、pH3.5、pH3.0、pH2.5、pH2.0)对烤烟叶片叶绿素含量、气体交换和叶绿素荧光参数的影响.结果表明:pH≥3.5处理的轻度酸雨对烤烟Chl.a含量影响不大,但pH≤3.5处理烤烟叶片Chl.b和总叶绿素含量显著下降.pH≤2.5模拟酸雨使烤烟叶片净光合速率(Pn)、气孔导度(Ls)、胞间CO2浓度(Ci)、叶面饱和蒸气压力亏缺(VPD)显著降低,使烤烟叶片的气孔限制值(Ls)和潜在水分利用效率(WUEi)显著升高,模拟酸雨使pH2.0处理烤烟叶片的蒸腾速率(Tr)和pH2.5处理的瞬时水分利用效率(WUE)显著降低.pH≥3.5处理的光合有效量子产量(EQY)、光合电子传递速率(ETR)和光化学猝灭(qP)与对照差异不大,但pH≤3.0处理明显降低;烤烟叶片的非光化学猝灭呈先升高后降低趋势,pH≥3.5处理的非光化学猝灭(NPQ)明显高于pH≤3.0处理.
Taking flue-cured tobacco as tested material, simulated acid rain (pH5.6, pH4.5, pH4.0, pH3.5, pH3.0, pH2.5, pH2.0) On chlorophyll content, gas exchange and chlorophyll fluorescence parameters of flue-cured tobacco leaves.The results showed that slight acid rain with pH≥3.5 had little effect on the content of Chl.a in flue-cured tobacco, but the chlorophyll content (Pn), stomatal conductance (Ls), intercellular CO2 concentration (Ci) and leaf vapor pressure deficit (VPD) of flue-cured tobacco significantly decreased with the pH value of 2.5, Stomatal limitation value (Ls) and potential water use efficiency (WUEi) increased significantly, and the simulated acid rain significantly reduced the transpiration rate (Tr) and the instantaneous water use efficiency (WUE) The photosynthetic effective quantum yield (EQY), photosynthetic electron transfer rate (ETR) and photochemical quenching (qP) of ≥3.5 treatments were not significantly different from those of the control, but the treatment with pH≤3.0 decreased obviously. The non-photochemical quenching of flue-cured tobacco leaves increased first High and then decreased. Non-photochemical quenching (NPQ) of pH≥3.5 was significantly higher than that of pH≤3.0.