Phenotypic and Photosynthetic Properties of Leaves in Phoebe zhennan

Determinations were conducted on leaf morphology and photosynthetic properties of 2-year container P. zhennan f. elliptical and P. zhennan f. oblong seedling in 2017 in Qingyuan, Zhejiang province. It was revealed that there was significant difference between two species and even among different layers in leaf area, leaf length, leaf width, and vein number. Net photosynthetic rate of P. zhennan f. elliptical was significantly higher than that of P. zhennan f. oblong. Multiple stepwise regression analysis and path analysis showed that net photosynthetic rate of P. zhennan f. elliptical was mainly influenced by stomatal conductance, intercellular CO2 concentration, leaf vapor pressure deficit, leaf temperature and transpiration rate, especially stomatal conductance. While net photosynthetic rate of P. zhennan f. oblong was by leaf vapor pressure deficit, relative air humidity, atmospheric CO2 concentration, transpiration rate and intercellular CO2 concentration, especially leaf vapor pressure deficit. The experiment resulted that young trees of tested species should be shaded and have sufficient water supply in the summer.