九州大学学術情報リポジトリ Kyushu University Institutional Repository 作物の群落構造と物質生産 : 受光および CO_2 拡散 : Ⅳ. 葉の傾き, サイズおよび葉面積密度の垂直分布が群落光合成に及ぼす影響 広田, 修九州大学農学部栽培学教室 武田, 友四

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九州大学学術情報リポジトリ Kyushu University Institutional Repository 作物の群落構造と物質生産 : 受光および CO_2 拡散 : Ⅳ. 葉の傾き, サイズおよび葉面積密度の垂直分布が群落光合成に及ぼす影響 広田, 修九州大学農学部栽培学教室 武田, 友四郎九州大学農学部栽培学教室 Hirota, Osamu Laboratory of Crop Husbandry, Faculty of Agriculture, Kyushu University Takeda, Tomoshiro Laboratory of Crop Husbandry, Faculty of Agriculture, Kyushu University https://doi.org/10.15017/22257 出版情報 : 九州大學農學部學藝雜誌. 42 (3/4), pp.125-136, 1988-03. 九州大學農學部バージョン :published 権利関係 :

hh_bqz$ (Sci. Bull. Fac. Agr., Kyushu Univ.) %42+$ 43 * 44 125-136 (1988) Relationship between Canopy Architecture and Crop Production with Reference to Light and CO2 Environments IV. Effect of the Leaf Inclination, Size and Vertical Distribution on Foliage Photosynthesis OSAMU HIROTA and TOMOSHIRO TAKEDA Laboratory of Crop Husbandry, Faculty of Agriculture, Kyushu University 46-06, Fukuoka 812-125

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~ O~ は単独にはそれぞれl.5~3% にすぎないが, これらの

Kondo, J., and S. Akashi 1976 Numerical studies on the two-dimensional flow in horizontally homogeneous canopy layers. Boundary- Layer Meteor., 10 : 255-272 McCree, K. J. 1970 An equation for the rate of respiration of white clover plants grown under controlled conditions. In : Proc. of the IBP/PP Technical Meeting (1969). Trebon, Wageningen. pp. 221-229 McCree, K. J. 1974 Equation for the rate of dark respiration of white clover and grain sorghum, as function of dry weight, photosynthetic rate, and temperature. Crop Sci., 14 : 409-414 Monteith, J. L. 1973 Principles of environmental physics. Edward Arnold, London.?%+%?& * &#Lw *???Em&2 * aan? 1970 @ @JK%9:hD%%Da,tikL:~~~?. b%%;cr 25 : 205-214 &B&te4&8*lsil =@.hti$+*!$? $U- 1984 @ ~~~~~~sb~~~~~~~~~~~~~a~~ ;is 3 % ~;fp@&x% ~$%Zl%t%@%?&%~~~0 Lb%!? EI@$Z 53 : 22-27 Thornley, J. H. M. 1970 Respiration, growth and maintenance in plants. Nature 227 : 3044305 Trenbath, B. R., and J. F. Angus 1975 Leaf inclination and crop production. Field Crop Abstructs 28 : 231-244 Watanabe, I. 1975 Transformation factor from carbon dioxide net assimilation to dry weight in crops. I. Soybean. Proc. Crop Sci. Japan 44 : 68-69 Winter, S. R., and A. J. Ohlrogge 1973 Leaf angle, leaf area and corn (Zea mays) yield. Agron. Jour., 65 : 395-397 Summary We studied the effects of foliage architecture on crop photosynthesis through the CO? diffusion in the canopy by the following method. The effect of different characteristics of foliage architecture (i.e., leaf inclination, leaf size in respect of width, leaf area profile) on crop photosynthesis was simulated by using each coefficient concerned with the COZ diffusion in a canopy described in our previous paper (Hirota & Takeda 1987). The results of the study are summarized as following ; Photosynthetic rate of the canopy which had spindle-shaped leaf area profile was about 1% higher than that of the canopy which had a mushroom-shaped. The leaf inclination affected both the light extinction coefficient (K) and the wind speed attenuation coefficient (,@ in the canopy. When the photosynthesis light response curve of the CJ plant was used for simulating the crop photosynthesis, the erectophile canopy was superior in crop photosynthesis to the planophile canopy because of the former s smaller k. When the G-light curve was used, on the contrary, the planophile canopy was better in crop photosynthesis than erectophile canopy, because leaves having G-light curve (not saturated) had higher photosynthetic rates at a high light intensity; and the planophile canopy was also superior to the erectophile canopy in COZ diffusion. Photosynthetic rate of a canopy with narrow leaves (1 cm wide) was about 3% higher than that of a canopy with broad leaves (9 cm diameter).

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