五种引种栽培的贵州特优观赏山茶光合生理特性研究

本文对引种栽培于贵州省植物园的小黄花茶 (CamellialuteofloraY .K .Li)、美丽红山茶 (C .delicataY .K .Li)、威宁短柱油茶 (C .salenensisStapf.ex .Bean .)、狭叶瘤果茶 (C .neriifoliaChang)和四球茶 (C .tachangensisF .S .Zhang)等贵州特优观赏山茶的光合生理特性进行了研究报道 :(1) ,均为C3植物 ,其CO2补偿点在 6 0 μL/L左右 ,光呼吸速率与总光合的比值为 2 5% ,光补偿点是 80 0～ 2 50 0lx ,光饱和点 16 0 0～4 10 0 0lx ;其中小黄花茶的光补偿点及光饱和点最低 ,威宁短柱油茶的光补偿点及光饱和点最高。 (2 ) ,净光合速率 (Pn) 6 .0 0～ 15.0 0CO2 mg/ (dm2 ·h) ,光呼吸速率 (Pr) 2 .0 0～ 5.0 0CO2 mg/ (dm2 ·h) ,其中威宁短柱油茶的Pn及Pr均较高 ,四球茶的Pn及Pr均较低。暗呼吸速率 (Dr) 0 .70～ 2 .6 0CO2 mg/ (dm2 .h) ,其中威宁短柱油茶的Dr较高 ,小黄花茶的Dr较低。 (3) ,Pn、Pr及Dr相互间呈正相关 ;Chl.(a b) (叶绿素 )含量 7.6 0～ 12 .50mg /dm2 ,其中小黄花茶的含量较高 ,威宁短柱油茶的含量较低。这一结论对研究其观赏植物学特性和扩繁栽培等具有科学价值

Studies on the photosynthesis and physiology of introduction and cultivation for five species of ornamental Camellia in Guizhou

Some photosynthetic properties of five wild species of Camellia (C. luteoflora, C. delicata, C. sulenensis, C. neriiflora and C. tachangensis) in Guizhou were studied. All the five species are C3 plants. The CO2 compensation point is about 60μL/L; the photorespiration rate is 25 % of the gross photosynthetic rate; the light compensation point is 800～2500lx; and the light saturation point is 1600～41000lx. Among the five species, the light compensation and saturation point of C. luteoflora is the lowest and C. sulenensis is the highest. The net tal chlorophyll content of C. luteoflora is higher than that of C. sulenensis.