日本中部山岳域における岐阜県産材と長野県産材の比較: 地場産材を使用した住宅における木材のライフサイクルアセスメントに関する基礎調査　その3

摘要

We calculated the net carbon balance by subtracting CO_2 emissions (fuel and electric consumption and by-products) from the amount of CO_2 absorption and carbon fixation of Japanese Cedar and Japanese Cypress trees in Gifu prefecture and Nagano prefecture. The net carbon balance of the Japanese Cedar in Gifu prefecture was 458kg-CO_2/m~3 and the Japanese Cypress in Gifii prefecture was 467kg-CO_2/m~3. The net carbon balances of the Japanese Cedar and the Japanese Cypress in Gifu prefecture were both lower than the net carbon balances in Nagano prefecture. The fixed CO_2 of the Japanese Cedar and the Japanese Cypress in Gifu prefecture were both lower than the fixed CO_2 in Nagano prefecture as well. The CO_2 emissions of the Japanese Cedar in Gifu prefecture were lower than those in Nagano prefecture, but the CO_2 emissions of the Japanese Cypress in Gifu prefecture were higher than those in Nagano prefecture.%昭和30年代以降に天然林を人工林に転換する拡大造林が進められ、造成された人工林が成長した結果、我が国の森林の蓄積は、平成19年に約44憶m~3となり量的に充実している。人工林の多くは間伐等の施業が必要な育成段階にあるものの50年生以上の林分が年々増加しており、人工林の木材を積極的に利用していく必要がある。