Photosynthetic and Shade-tolerance Characteristics of Eight Ornamental Plants

The morphological characteristics of plant leaves,photosynthesis and light response were measured,the variance and correlation of the results were analyzed,and the extent of their shade-tolerance were compared for eight ornamental plants in Zhangzhou.The results showed that except for Ficus microcarpa cv.GoldenLeaves,the other varieties had a strong ability to use and adapt to low light.Bougainvillea spectabilis,Rhododendron pulchrum and Excoecaria cochinchinensis had a strong shade-tolerance,so they could be used under buzzed forest cover.Ficus microcarpa cv.GoldenLeaves,and Malvaiscus arboreus var.penduliflorus were photophilous plants,could adapt to a strong light radiation and had relatively poor shade-tolerant capability,so they could be used in forest edges or grasslands.The more light,the more colorful of the leaves of Ficus microcarpa cv.GoldenLeaves and Malvaiscus arboreus var.penduliflorus.Duranta repens'Variegata'had a wide light ecological suitabilty both in shade-tolerant and strong solar radiation,so they could be used in the ornamental layout without light restriction.Osmanthus fragrans and Excoecaria cochinchinensis could make better use of soil moisture,so they could be used in relatively dry areas.Correlation analysis of Pn and other main influencing factors Gs,Ci,Tr,VpdL,PAR showed that: different varieties had different impact factors.Pn and Ci of the eight ornamental plants were significantly related.This study provided a theoretical basis for the configuration of ornamental plants.