Abstract:

The effect of light in site fragmentation in Bei Mount in Zhejiang Province on physiological characteristics ofHeptacodium miconioides was studied. Characteristics of leaves, photosynthesis, membrane lipid peroxidation and endogenous protective enzymes ofH. miconioides were affected by light stress caused by fragmentation. The results indicated that in strong light (>800μmol·m^-2 s^-1) caused by fragmentation, conductivity and content of malondialdehyde (MDA) ofH. miconioides leaves increased significantly, value of chlorophyll a/b increased, and content of chlorophyll, photosynthesis, stomatal conductance and activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and ascorbate peroxidase (AP) decreased. The results suggested that H. Miconioides was applicable in 350～650μmol·m^-2s^-1.

Key words: Heptacodium miconioides, Site fragmentation, Light stress, Physiological characteristics