Net Photosynthetic Productivity at Different Canopy Layers of Cinnamomum camphora

• Main Authors: Hung, Li-wen, 洪儷文
• Other Authors: Wang, Ya-Nan
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/37079211777544603943

碩士 === 國立臺灣大學 === 森林學研究所 === 90 === The main purpose of this experiment was to study the correlation between photosynthesis of camphor tree, environment and physiology factors, and other major effect factors. Furthermore, to obtain the annual leaf productivity data. The statistical data of this experiment was analyzed by pair-sampled T-test and proceed regression models. The results showed that there were big differences between sun-grown leaves and shade-grown leaves with effect of environment, photosynthesis or transpiration factors. However, there was no difference between the upper and lower crown of trees with effect of environment, photosynthesis or transpiration factors. In terms of photosynthesis factor, the proceed regression model analysis showed that the photon flux density is the major factor to photosynthesis in all seasons. For sun-grown leaves, the photon flux density and leaf temperature were main influential factors to photosynthesis most of the time. For shade-grown leaves, only leaf temperature was the major influential factor to photosynthesis. The experiment also discovered there were high correlation between the speed of photosynthesis at 9 o’clock every mornings and diurnal carbon gains. In addition to the estimation of annual phtosynthetic productivity, among the total area of 124 m2 of camphor leaves containing 30% of sun-grown leaves and 70% of shade-grown leaves in this experiment, 234 kg of Carbon Dioxide can be stabilized per year, among all, sun-grown leaves contributes 54% and shade-grown leaves contributes the other 46%.