通过1a的盆栽试验,研究3种不同pH值(2.5、4.0、5.6)的模拟酸雨溶液对樟树(Cinnamomumcamphora)2年生幼苗生长的影响,利用叶绿素荧光技术测定了模拟酸雨胁迫后樟树的叶绿素荧光参数变化规律。结果表明:PSII最大光化学量子产量(Fv/Fm)、PSII的潜在活性(Fv/Fo)、PSII实际光化学量子产量(ФPSII)和叶绿素含量具有一致的变化趋势,其值都随着模拟酸雨pH值的降低而升高,pH4.0时处理值达到最大,表明樟树在pH4.0处理条件下,可以更好的推动光合电子传递,提高了光合电子传递能力,进而利用光能,进行光合作用,促进樟树的生长。
Effect of three different pH of simulated acid rain ( 2.5, 4.0, 5.6 ) on chlorophyll fluorescent properties of the 2-year seedlings of Cinnamomum camphora was studied by pot experiment. Results showed that the maximal photochemical efficiency of photosystem II( PSII )(Fv/Fm), potential activity of PSII ( Fv/Fo ), actual photochemical efficiency of PSII ( ФPSII ) and chlorophyll content increased with decrease of pH, and topped when pH of acid rain is 4, indicating that, C. camphora had better usage of solar energy. The treatement of pH4.0 could promote photosynthetic electron transport rate ( ERT ), and improve photosynthesis.