| Summary: | 碩士 === 國立中興大學 === 植物學系 === 90 === Summary
The purpose of this study is to explore the seasonal variations of photosynthesis and related physiological characteristics of conifers in high and low elevation of subtropical Taiwan. Picca morrisonicola and pinus taiwanensis were used as materials.
It was observed from that the photosynthesis and chlorophyll fluorescence of Picea morrosonicola in Takata Area had been maintained a higher level from late spring to early winter. Then decreased with temperature decreasing in winter and recovered with temperatuer increased. Pinus Taiwanensis was as same as Picea morrisonicola in winter but the decrease of its photosynthesis effectiveness was early than that of Picea morrisonicola. The seasonal variation on chlorophyll fluorescence of Pinus Taiwanensis could not be seen in Hung-sun Area , but which variation of capacity in different seasons were related to rainfall.
The flush and cambial division of Pinus Taiwanesis in Hung-sun Area usually begins in March, on the contrary which was begins in April in both Picea Morrisonicola and Pinus Taiwanesis in Taketa Area. This difference might be due to the differences in temperature and rainfall of the Hung-sun and Takaka Areas. It also observed that the seasonal variation of carbohydrat and sugar were relate to the seasonal of flush and cambinal division as well as temperatuer and rainfall.
It was concluded that, the accumulation and utilization of carbohydrate, the discrepancy of flush and cambial division, and the efficiency of photosynthesis, of Pinus Taiwanensis and Picea morrisonicola in both Takaka and Hung-sun Areas, all closely linked with the factors such as the changes of temperature and rainfall in the specific sections they exist.
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