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 : Ⅴ. グレインソルガムの草高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

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1 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 : Ⅴ. グレインソルガムの草高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 出版情報 : 九州大學農學部學藝雜誌. 42 (3/4), pp , 九州大學農學部バージョン :published 権利関係 :

2 j~k,&f$$$$ (Sci. Bull. Fat. Agr., Kywhu Univ.) %42% 43.4% (1988) Relationship between Canopy Architecture and Crop Production with Reference to Light and CO2 Environments V. Effect of the Canopy Height on Foliage Photosynthesis of Grain Sorghum Stands OSAMU HIROTA and T OMOSHIRO T AKEDA Laboratory of Crop Husbandry, Faculty of Agriculture, Kyushu University Fukuoka 812

3 つないだ. 同化箱に送った空気の流量は 4~51/min で, 同化箱の葉面積は 0.4~0.7dm' であった. 同化箱葉気温差が大きくなると思われる1l ~14 時の測定例

4 ~ ~

5 C4 植物の葉温は周囲温度よりも 2~50C ほど ~O

7 Y,~Pnl Y,~< 常は, 実験室などでは IY~I くれの場合が多く,

8 r~)/2)] と CO, 濃度のポテンシャル ([CO,],,,

9 ,...,~.' さて, ここで Fig. 1O ~12 を用いて, 光一光合成曲

10 -~ ~ ~ d ン ~---

11 ~ Q.~

12 ~ れば, 一日当りの呼吸 R~ は, ~ ~ ~

15 は両個体群の CGR の差 (30~40%) にほど遠い値であ

16 j?h%% 1978 lf%u 53 %-h+~l7 u Y 9 %%%@~F. PP. 4 Lemon, E. R Photosynthesis under field conditions. II An aerodynamic method for determining the turbulent carbon dioxide exchange between the atmosphere and a corn field. Agron. Jour., 52: Louwerse, W. and W. v. d. Zweerde 1977 Photosynthesis, transpiration and leaf morphology of Phaseolus valgan s and Zea mays grown at different irradiances in artificial and sunlight. Photosynthetica 11 : McCree, K. J 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: Monteith, J. L Principles of environmental physics. Edward Arnold, London Monteith, J. L., G. Szeiz and K. Yabuki 1964 Crop photosynthesis and the flux of carbon dioxide below the canopy. J. Appl. Ecology, 1 : Oikawa, T Canopy photosynthesis of the plant population simulated on the basis of light and CO, conditions. In : JIBP Synthesis (ed., Monsi, M., and T. Saeki) 19 : &~~F%+!B * 1983 I?%!J@l#%fl~ dr a,kr %$JR 0%~t+%@F.,&kQ GEP M@j II -4m (2) -2. pp Summary The field experiment was carried out to study the effect of canopy height on CO* diffusion and canopy photosynthesis using the isogenic line of grain sorghum with different canopy height. Using the data obtained from the field experiment, CO2 profile and canopy photosynthesis of grain sorghum were simulated. The results of the study are summarized as following ; Canopy architecture of tall type grain sorghum was superior to the short type in all the factors concerning the CO? diffusion (wind speed at canopy surface, drag coefficient, attenuation coefficient of wind speed, mixing length and leaf width). High leaf photosynthetic rates (more than 100 mg COz/dmzh) were observed under a field condition. The CO, profiles simulated by using these values of leaf photosynthesis coincided with COn profiles measured in the canopy. Crop photosynthesis of tall type grain sorghum which has a LA1 of 6.27 was 12% higher than that of short type which has a LA1 of Under the condition of a LA1 of 6.0, the crop photosynthesis of tall type was 8% higher than short type canopy.

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

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,