A Study on the Photosynthesis of Several Tree Species Planted in a Green Belt as an Index for Tree Vitality

Abstract

Net photosynthesis rate of four evergreen broad-leaved tree species (Quercus glauca, Castanopsis cuspidata var. Sieboldii, Machilus Thunhbergii and Myrica rubra) of some growth status, which are planted six years ago as reclamation work of Takahama power station, Fukui Prefecture, was measured with a portable photosynthesis analyzer (LI-6200 of LI-COR Inc.) in summer fine day. The results are as follows:(1) The change of photosynthesis rate of a day was classified into three types, which were that formed smooth mount shape, that had a peak in morning and that sank in mid-day.(2) According to the condition of growth, Ieaf teperature and quantum, each species showed interesting responses in photosynthesis activity.(3) It considered that these differences were referred to high temperature, luck of moisture, condition of growth and the relaion between source and sink in plants.