流苏光合生理日变化及光响应的特征

Photosynthetic Diurnal Change and Light Intensity Response of Chionanthus retusus

采用Li-6400便携式光合作用测试系统对6个类型的流苏的光合生理指标进行了测定。结果表明,(1)类型四的光合速率日变化呈"双峰型"曲线,类型一、二、三、五、六呈"单峰型"曲线。(2)6个流苏类型的各个光合指标除去Gs均存在极显著的差异。(3)类型六光合能力最强,对光的适应力也很强,Tr稍大,所以在水分充足的情况下可能会生长得更好。

Photosynthetic and physiological index of 6 types of Chionanthus retusus were measured by using portable LI-6400 Photosynthesis System （LI-COR）. The results showed that, （ 1 ） The net photosynthetic rate of type IV had a bimodal pattern and had a clear midday depression. The net photosynthetic rate of type I , II , m, v and Wl had a unimodal pattern; （2） There were significant differences in photosynthetic indexes among these 6 types of Chionanthus retusus except for Gs; （3） Type VI had the best photosynthetic capacity with better ability for adapting different light density, therefore it could grow better with enoueh water.