辽东地区4种林下经济植物光合特性研究

采用Li-6400便携式光合测定系统，对4种林下经济植物的净光合速率、蒸腾速率、气孔导度、胞间CO2浓度进行测定。结果表明：4种林下经济植物的净光合速率日变化曲线均为双峰型曲线，存在明显的光合“午睡”现象，日平均净光合速率的大小顺序为大叶芹〉五味子〉穿龙薯蓣〉移山参；大叶芹、五味子、穿龙薯蓣的蒸腾速率日变化曲线均为双峰型，而移山参为单峰型；4种林下经济植物胞间CO2浓度日变化曲线呈典型“V”字形。

Photosynthetic characteristics of four economical plants under-forest in eastern Liaoning

To further study the photosynthetic characteristics of Radix ginseng, Pimpinella brachycarpa , Fructus schisandraea , Dioscorea nipponica, which g/own under-forest of eastern Liaoning Province, and provide theory basis for their scientific planting, the diurnal variation of net photosynthetic rate, transpiration rate, stomata conductance, intercellular concentration and A-Ci of the four Economical plant under forest, were measured by Li-6400 portable photosynthesis system. The results were as in the research area, the diurnal courses of photosynthesis were double peaked. The diurnal change of net photosynthetic rate, transpiration rate and stomata conductance were basically accordant. The diurnal variation curves of intercellular CO2 concentration of four cultivars were V-shape. We can conclude that it is possible the photosynthetic rates of these four medical plants by CO2 enrichment.