@article{oai:nagoya.repo.nii.ac.jp:00006834,
 author = {NAGY, Miklos and ナジ, ミクロシュ and OGAWA, Kazuharu and 小川, 一治 and HAGIHARA, Akio and 萩原, 秋男},
 journal = {名古屋大学森林科学研究},
 month = {Dec},
 note = {The CO_2 gas exchange of hinoki cypress (Chamaecyparis obtusa (Sieb. et Zucc.) Endl.) branches was measured continuously with an open gas exchange system for 12 (Experiment 1) and 17 months (Experiment 2) in chambers supplied by ambient (370 μmolCO_2 mol^－1) and elevated (800 μmolCO_2 mol^－1) air under field conditions. The daily respiration increased linearly with increasing daily gross photosynthesis in each month. The two-component model was used to examine how maintenance and growth components of respiration were effected by elevated CO_2 enrichment. The partitioning of the respiration into maintenance and growth components was carried out monthly. The slope k of the two-component model did not differ between CO_2 treatments at a significance level of 1%. Both growth and maintenance respiration components tended to increase in elevated CO_2. The growth respiration increment induced by CO_2 enrichment showed a seasonal fluctuation in the ratio (elevated to ambient) from about 1.0 during winter to 1.65-1.80 during summer and seemed to be related to increasing photosynthesis rate. On the other hand, the ratio of maintenance respiration in elevated CO_2 to that in ambient CO_2 increased gradually to an upper limit of around 1.50－1.55 with increasing leaf carbon content and decreasing specific leaf area. N-content per unit leaf area did not increase in elevated CO_2 treatment . The different time-course in the responses altered the balance between growth and maintenance components at the first period of experiments, but this effect disappeared after 4-6 months of CO_2 treatment., 野外に成育するヒノキの枝のガス交換が外気濃度(370μmolCO_2 mol^－１)と高濃度(800μmolCO_ 2 mol^－１)で開放系システムのチャンバーを用いて連続的に12ヶ月(実験1)と17ヵ月(実験2)測定された。各月において、日呼吸量は日総光合成量の増加に伴って直線的に増加した。維持呼吸と成長呼吸が高濃度CO_2によりどのように影響されるかを調べるために2－コンポーネントモデルが使用された。呼吸量の維持呼吸と成長呼吸への分配は毎月実施された。2－コンポーネントモデルの傾きkは両CO_2処理間で有意差1%で差はなかった。成長呼吸、維持呼吸とも高濃度のCO_2により増加する傾向にあった。高濃度のCO_2により増加した成長呼吸は季節変化を示し、その比(高濃度区/外気濃度区)は冬期は約1となり、夏期は1.65-1.80となった。一方、維持呼吸の比(高濃度区/外気濃度区)は葉内炭素含量の増加と比葉面積の減少に伴い上限値1.50-1.55まで徐々に増加した。単位葉面積当たりの葉内窒素量は変化しなかった。成長呼吸と維持呼吸のバランスは実験開始後、両CO_2処理間で異なったが、4-6ヶ月後に差はなくなった。, 農林水産研究情報センターで作成したPDFファイルを使用している。},
 pages = {1--8},
 title = {Growth and maintenance respiration of hinoki cypress (chamaecyparis obtusa (Sieb. et Zucc.) Endl.) branches exposed to long-term CO_2 enrichment it the field},
 volume = {18},
 year = {1999}
}