- 期刊
行道樹黑板樹二氧化碳固定效益之研究
The Carbon Dioxide Fixation Efficiency of Alstonia Scholaris of Sidewalk Tree
摘要
本研究利用行道樹栽植10年生之黑板樹為材料，自2002年4月至2003年3月，每月選擇晴天一天，自上午八時至下午四時，分別就黑板樹冠層之上部及下部葉片進行光合作用速率、蒸散速率、氣孔導度及其相關因子葉溫、光度、相對濕度與CO2濃度之測定。結果上部葉片淨光合作速率日平均值為3.53μ mol m^(-2)s^(-1)，蒸散速率0.69m mol m^(-2)s^(-1)，氣孔導度48.46 m mol m^(-2)s^(-1)，葉片溫度24.40℃，光度282.92 μ mol m^(-2)s^(-1)，相對濕度54%，CO2濃度352.68 μ LL^(-1)，全株每年可固定CO2量為56.76 kg。
並列摘要
The Carbon Dioxide fixation efficiency of Alstonia scholaris which will be a reference for sidewalk trees planning afterward 10, was analyzed by measuring net photosynthetic rate, transpiration rate, stomatal conductance rate, leaf temperature, light intensity, relative humidity and the concentration of CO2, from 8 am to 4 pm, one sunny day of every month. The results showed that: the mean value of net photosynthetic rate was 3.53 μ mol CO2m^(-2)s^(-1), transpiration rate was 0.69 mmol H2Om^(-2)s^(-1), stomatal conductance rate was 48.46 mmolairm^(-2)s^(-1), leaf temperature was 24.40℃, light intensity was 282.92 μ mol m^(-2)s^(-1), relative humidity was 54% and the concentration of carbon dioxide was 352.68 μ LL^(-1). For one year, the carbon dioxide fixation of whole tree estimated was 56.76 kg.