林木對碳吸存效益評估

Assessing the Benefit of Carbon Sequestration for Forest Trees

王義仲(Yi-Chung Wang)

《華岡農科學報》 10期 (2002/12) Pp. 53-67

摘要

本文嘗試著將台灣全島之各類林型林木蓄積量估算成碳素貯積量，然後求得林木之CO2吸存量，同時由生長率的情形來推估未來之每年林木生長量，換算成每年的二氧化碳吸存，再由每年全台之二氧化碳排放總量來得知林木生長量之碳吸存佔排放量之百分比，以得知林木產生之效益。本研究以1993年林務局第三次台灣森林資源及土地利用調查資料，1993年之林木總蓄積共約3.59億m^3，約貯存了4.86億噸CO2，預估到2003年之林木蓄積約4.92億m^3，CO2貯積6.74億噸，1993年之林木年生長量1,082萬m^3，預估2003年之年生長量為1,613萬m^3，林木產生之CO2年吸存量分別為1,534萬噸及2,282萬噸，此CO2吸存量佔全國年CO2總排放量之9.86%，顯見林木在CO2的貯積上具正面效益。

關鍵字

林木 ； 碳貯積 ； 二氧化碳 ； 年生長量 ； 蓄積量

並列摘要

This study attempted to evaluate the effects of forest trees on carbon sequestration. Annual growth increment of forest trees was estimated based on annual growth rate. Annual growth stock volume of forest trees was converted into the amount of carbon dioxide sequestration, and which occupied how much percentage of total carbon dioxide emission in Taiwan was appraised. All data used in this study is based on the third survey of forest resources and land use in Taiwan conducted by Taiwan Forestry Bureau. In 1993, all forest stock volume was 359 million m^3 with 486 million-ton CO2 storage. Forest tree stock volume of 492 million m^3 will be predicted by 2003with 674 million-ton CO2. Annual growth increment was 10.8 million m^3 with 15.3million tons CO2 sequestration in 1993 and the volume will increase to 16.1 million m^3with 22.8 million tons CO2 sequestration by 2003. Annual CO2 sequestration occupied of forest tree 9.86% of total CO2 emission amount, which also meant forest trees had a positive effect on carbon storage.

並列關鍵字

Forest trees ； carbon sequestration ； carbon dioxide ； annual growth increment ； stock volume