【作者】 刘楠； 林植芳； 关岚岚； 林桂珠； 彭长连；

【Author】 Nan Liu~1 Zhi-Fang Lin~1 Lan-Lan Guan~1 Gui-Zhu Lin~1 Chang-Lian Peng~(2*) 1 Heshan National Field Research Station of Forest Ecosystem,South China Botanical Garden.Chinese Academy of Sciences,Guangzhou 510650,China,2 College of Life Sciences,South China Normal University,Guangzhou 510631,China

【机构】 鹤山森林生态系统国家野外科学观测站中国科学院华南植物园； 华南师范大学生命科学学院；

【摘要】 通过对亚热带森林三种代表植物马尾松（Pinus massoniana）,荷木（Schima superba）和肖蒲桃（Acmena acuminatissima）幼苗进行长时间（33个月）的不同光照（100%自然光和12%自然光）驯化后,三种植物的快速光响应曲线（RLC）,叶绿素荧光成像和叶绿体超微结构均发生了不同程度的改变。当叶片切段被浸泡在50 mM NaHSO₃ 10小时后,植物的快速光响应曲线降低,叶绿素荧光成像显示出更多的暖色且成像面积缩小,叶绿体超微结构因物种的不同而发生不同程度的改变。研究结果显示,作为亚热带森林演替顶级阶段代表树种,肖蒲桃的光合机构在两种光强下对NaHSO₃伤害均不敏感。相反,作为亚热带森林演替的先锋树种,马尾松的叶绿体则更容易收到NaHSO₃的伤害。由此推测,SO₂污染可能成为加速亚热带森林演替进程的因素之一。更多还原

【Abstract】 Aims The effects of long-term（33 months） sun/shade acclimation and short-term （within 10 h） HSO₃^-treatment on leaf photosynthetic apparatus were investigated in three subtropical forest plants,Pinus massoniana,Schima superba,and Acmena acuminatissima. Methods After 33 months’ growth in two light environments（100%and 12%sunlight）,rapid light curves（RLC）,chlorophyll fluorescence imaging and chloroplast ultrastructures of three tested species were changed to different degrees.When leaf sections were immersed in 50 mM NaHSO₃ for 10 h,all the RLCs were lowered;chlorophyll fluorescence imaging was inclined to present warmer colors and imaging areas were decreased.However,changes in chloroplast ultrastructures differed from three species. Important Findings Our results showed that the photosynthetic apparatus of a dominant species, A.acuminatissima,in the late succession stage of a subtropical forest in South China,was less sensitive to NaHSO₃ under both growing light intensities.Conversely,the chloroplasts of P. massoniana,the pioneer heliophyte species,were most susceptible to NaHSO₃.It is deduced that, SO₂ pollution may become as a factor to accelerate the succession of subtropical forest.更多还原