- 期刊
森林能源作物之二氧化碳吸存效果與能源產出效率
The Effect of Carbon Sequestration and Energy Production Efficiency for Forest Energy Crops in Taiwan
摘要
本研究在於探討種植能源作物之二氣化碳吸存效果與能源產出效率及台灣地區栽植能源作物之可行性，針對適合台灣地區栽植之能源作物樹種，銀合歡、桉樹、相思樹，分析林木對增加二氧化碳吸存量及替代化石燃料燃燒排放所產生的能量及相對減少的二氧化碳排放量。結果顯示：如以單一伐期分析，3年生銀合歡的二氧化碳吸存量為95.l4Mg/ha(Mg=10^6g)，6年生桉樹的二氧化碳吸存量為171.20Mg/ha，10年生相思樹的二氧化碳吸存量為155.00Mg/ha。能源作物之能源產生量：3年生銀合歡的能源產生量為47.36×10^4MJ/ha，6年生桉樹的能源產生量為85.75×10^4MJ/ha，10年生相思樹的能源產生量為79.33×10^4MJ/ha。能源作物替代化石燃料可減少的二氧化碳排放量(kg-CO2)，3年生銀合歡能源作物使用之二氧化碳排放量為2.04×10^4kg-CO2，6年生桉樹能源作物使用之二氧化碳排放量為3.69×10^4kg-CO2，10年生相思樹能源作物使用之二氧化碳排放量為3.41×10^4kg-CO2。因此栽植能源作物對減緩二氧化碳的排放確有其正面效果。台灣地區栽植能源作物之可行性之考量因素中，如何獲得較大的栽植面積，便成為能源作物推廣的最重要的關鍵因素。如能有效解決栽植地點的問題，能源作物能相當有效地解決能源及二氧化碳排放的問題。
並列摘要
The purpose of this project was to study the efficiency of carbon sequestration, energy production, and feasibility of planting energy crops. By establishing growth, carbon sequestration, and alternative energy models, the potential biomass production, CO2 sequestration quantity. and energy substitution of Leucaena leucocephala, Eucalyptus spp. and Acacia confusa were analyzed. Results showed that amount of CO2 sequestration varied with crops: 95.14Mg/ha (Mg=10^6g) of 3-year-old Leucaena leucocephala. 171.20Mg/ha of 6-year-old Eucalyptus spp., and 155.00Mg/ha of 10-year-old Acacia confusa. The energy production efficiency for 3-year-old Leucaena leucocephala was 4.74×10^5 MJ/ha, 6-year-old Eucalyptus spp. 8.58×10^5 MJ/ha, and 10-year-old Acacia confusa 7.93×10^5 MJ/ha. The energy crops could substitute the fossil fuels for energy use and reduce CO2 emission. The CO2 reduction for 3-year-old Leucaena leucocephala was 2.04×10^4 kg-CO2, 6-year-old Eucalyptus spp. 3.69×10^4 kg-CO2, and 10-year-old Acacia confusa 3.41×10^4 kg-CO2. The key variable for bioenergy development in Taiwan was to find potential suitable lands.