Respiration Consumption by Woody Organs in a <i>Chamaecyparis obtusa</i> Plantation

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  • ヒノキ人工林の非同化器官による呼吸消費
  • ヒノキ人工林の非同化器官による呼吸消費〔英文〕
  • ヒノキ ジンコウリン ノ ヒ ドウカ キカン ニヨル コキュウ ショウヒ エイ

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Respiration consumption by woody organs was investigated for a 18-year-old Hinoki, Japanese cypress (Chamaecyparis obtusa S. et Z.) plantation (as of 1974) during 1975_??_1978. Biomass and its increment for each organ were 37 td, wt/ha and 8.4 t d. wt/ha•yr for stem, 6.1 and 1.4 for branches, 16 and 3.8 for roots, totaling 59 td. wt/ha and 14 t d. wt/ha•yr, respectively. The respiration rates per unit of fresh weight of stem and roots, including fine roots, decreased with increased diameter. The branch respiration rate increased with increased height above the ground. The thermal coefficients of stand respiration were 3.7 in setm, 3.6 in branches, 3.3 in roots, excluding fine roots, and 3.4 in fine roots. The stand respiration rate showed a rapid increase from March to a maximum in August, maintained a more or less constant level from June to August, had a sudden decrease from August to October, and then decreased gradually toward December. The annual respiration rates were estimated to be 6.1 td.m./ha•yr in stems, 1.6 in branches, and 2.8 in roots (0.97 in fine roots alone). Therefore, the annual respiration loss by woody organs in this C. obtusa plantation amounted to 10 t d. m./ha•yr. Relative contributions by these organs were 58 percent for stems, 15 percent for branches, and 27 percent for roots.

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