模拟酸雨对刨花楠幼苗生长和光合生理的影响

研究了模拟酸雨对亚热带典型用材树种和经济树种刨花楠(Machilus pauhoi)幼苗生长和光合生理的影响,以期为浙江省引种刨花楠提供科学依据.结果表明,pH4.0的模拟酸雨对刨花楠株高、地径和叶绿素含量无明显影响,而pH2.5的模拟酸雨使株高显著降低;pH为4.0的模拟酸雨对刨花楠的光合参数无显著影响,而pH为2.5的酸雨处理则能明显提高刨花楠的胞间CO2浓度、暗呼吸速率以及光补偿点、增加气孔导度和蒸腾速率,显著降低最大净光合速率;相关分析和回归分析表明,酸雨增加了刨花楠对环境的敏感性.

Effect of simulated acid rain on growth and photosynthetic Physiology of Machilus pauhoi

Machilus pauhoi is a typical subtropical precious timber and economical tree species. In order to provide scientific basis for the introduce of Machilus pauhoi in Zhejiang province, the effects of simulated acid rain (SAR) on its growth and photosynthesis were measured. The results showed that plant height distinctly reduced by Ph2.5, but no significant impact on height, ground diameter and chlorophyll at Ph4.0. SAR (Ph 4.0) has ho significont effect on photosynthetic mdexs, while SAR (Ph 2.5) improved the intercellular CO_2 concentration(Ci), the dark respiration rates(Rd) and light compensation point (LCP),increased stomatal conductance (Gs) and transpiration rate (Tr),resulting in that the maximum net photosynthesis(Amax) of Machilus pauhoi was significant lower. The result revealved the sensitivity of Machilus pauhoi to acid rain enhanced environment through correlation and regression analysis.