摘 要：
以三花杜鹃为试材,在全光照(1 400~2 000μmol·m~(-2)·s~(-1))、林缘(800~1 600μmol·m~(-2)·s~(-1))和林下(100~500μmol·m~(-2)·s~(-1))3种光照环境下,分析了三花杜鹃的叶片性状及光合特性,以探讨三花杜鹃栽培适宜的光环境。结果表明:随光强的减弱,三花杜鹃的叶长、叶宽增加,比叶重下降。林缘和林下2个处理的总叶绿素含量均显著低于全光照处理,叶绿素a/b虽略有下降但差异不显著。与全光照环境相比,林缘和林下处理的三花杜鹃光饱和点(LSP)、光补偿点(LCP)和暗呼吸速率(Rd)呈现下降的趋势,但最大净光合速率(Pmax)以林缘处理最高,为9.58。综合分析,林缘处理的光环境较适宜三花杜鹃,因此在园林设计中应注意与其它植物的搭配,适度遮阴。
译 名：
Comparative of Photosynthetic Characteristics of Rhododendron triflorum Under Different Light Environments
作 者：
LIU Lin;ZHANG Liangying;FEI Wenqun;CAO Runfa;Department of Plant Science,Tibet Agricultural and Animal Husbandry College;
关键词：
R.triflorum;;light environments;;photosynthetic characteristics;;leaf traits
摘 要：
Rhododendron triflorum was used as material,leaf traits and photosynthetic characteristics of Rhododendron triflorumunder different light environments(1 400-2 000,800-1 600,100-500μmol·m~(-2)·s~(-1))were analyzed,in order to select the suitable light environment for cultivation.The results showed that with the decrease of light intensity,the leaf length and leaf width increased but the specific leaf weight decreased.Compared with the full sunlight treatment,total chlorophyll content of R.triflorumgrown in the forest or forest edge were both significantly reduced,but the ratio of chlorophyll a/b of the two treatments had not decline significantly.Under full sunlight environment,the light saturation point(LSP),light compensation point(LCP)and dark respiration rate(Rd)were the highest.However the maximum net photosynthetic rate(Pmax)of the forest edge treatment was the highest overall.After comprehensive analysis,it was concluded that the forest edge treatment may be the most appropriate light environment for R.triflorum.
