PHYSIOLOGICAL AND ECOLOGICAL STUDIES ON THE PLANT PRODUCTION IN PLANT COMMUNITIES : 3. ECOLOGICAL CONSIDERATION OF THE TEMPERATURE-PHOTOSYNTHESIS CURVES OF EVERGREEN BROAD-LEAVED TREES

Abstract

The temperature-photosynthesis and respiration curves of Shiia Sieboldii, Machilus Thunbergii, Distylium racemosum, Rapanaea neriifolia, Illicium religiosum, Quercus glauca ; Myrica rubra, Lithocarpus edulis, Symplocos lucida, Camellia japonica, Eurya japonica and Cinnamomum camphora were measured in order for the ecological study of evergreen broad-leaved forest on the basis of the production of matter(plant production). The relative daily gross photosynthetic production was calculated from these curves at each temperature and further the seasonal change of net photosynthetic production was calculated from these relative daily gross production. In the analysis of plant community on the basis of plant production, it seems that light influences directly the structure of the community, on the contrary, temperature affects the plant distribution and the plant distribution controls the composition and structure of the community. Among the 12 plants, the net production of the year and the seasonal production were different. The production of C. japonica, I. religiosum, S. Sieboldii, M.. rubra, E. japonica fell not remarkably in winter and those of S. lucida, S. sieboldii, Q. glauca were very high at high temperature in summer. Other plants, especially, M. Thunbergii, D. racemosum, L. edulis were high in spring and autumn. It is recognized that this fact correlates to their distribution. However, since many problems affecting the plant production still remain, they are reserved for another opportunity.