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＜departmental bulletin paper＞
Relationship between Canopy Architecture and Crop Production with Reference to Light and CO, Environments : II. CO, Diffusion Coefficient and Canopy Photosynthesis of Rice and Soybean Populations

Creator
Author PID
L001267
Creator Name
広田, 修
Hirota, Osamu
Affiliation
Affiliation Name
九州大学農学部栽培学教室
Laboratory of Crop Husbandry, Faculty of Agriculture, Kyushu University
Author PID
L002112
Creator Name
武田, 友四郎
Takeda, Tomoshiro
Affiliation
Affiliation Name
九州大学農学部栽培学教室
Laboratory of Crop Husbandry, Faculty of Agriculture, Kyushu University
Language
Japanese
Publisher
九州大學農學部
Faculty of Agriculture, Kyushu University
Date
1987-03
Source Title
Science bulletin of the Faculty of Agriculture, Kyushu University
Vol
41
Issue
3/4
First Page
123
Last Page
131
Publication Type
Version of Record
Access Rights
open access
JaLC DOI
https://doi.org/10.15017/22238
Related DOI
九州大學農學部學藝雜誌 || 41(3/4) || p123-131
Science bulletin of the Faculty of Agriculture, Kyushu University || 41(3/4) || p123-131
http://www.agr.kyushu-u.ac.jp/
Related URI
九州大學農學部學藝雜誌 || 41(3/4) || p123-131
Science bulletin of the Faculty of Agriculture, Kyushu University || 41(3/4) || p123-131
http://www.agr.kyushu-u.ac.jp/
Relation
九州大學農學部學藝雜誌 || 41(3/4) || p123-131
Science bulletin of the Faculty of Agriculture, Kyushu University || 41(3/4) || p123-131
http://www.agr.kyushu-u.ac.jp/

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Details

Record ID
22238
Peer-Reviewed
Unrefereed
Subject Terms
CO_2拡散係数
群落光合成
熱収支法
ISSN
0368-6264
NCID
AN0005519X
Notes
The characteristics of CO, diffusion within canopies of rice and soybean were investigated by the heat balance method. There were differences between CO, profiles within rice and soybean stands. The minimum CO, concentration within the rice stand appeared in the lower layer but that within the soybean appeared in the upper layer of the canopy. And in spite of the rice stand having larger leaf area index than soybean, CO_2 source activity in lower layer of rice canopy was smaller than that of snybean stand. These differences might be resulted because light extinction coefficient of rice stand was so small that rice leaves could recieve more light energy than those of soybean and then leaf photosynthesis at the lower layer of the rice was higher than soybean stand. Canopy photosynthetic rates at noon were 8.8g CO_2, /m^2h in rice and 6.8g CO_2 /m^2h in soybean stands.
水稲個体群と大豆個体群におけるCO_2拡散の特徴を熱収支法で調べた.1)草高がほぼ等しい水稲と大豆個体群の植被面のCO_2拡散係数はほぼ等しかった.しかしながら,水稲個体群ではLAIが大きかったので,CO_2拡散係数の減衰係数は大豆個体群よりも大きくなった.2)群落内のCO_2プロファイルの特徴は水稲と大豆では異なり,水稲個体群ではCO_2濃度の極小値が群落の下層にあるのに対して,大豆個体群では上層にあった.また,水稲個体群ではLAIが大きいにもかかわらず,群落の下層におけるC0_2のsourceとしての働きは大豆個体群よりも小さかった.これは水稲では光の消散係数が小さく,下層でも光合成作用が行われていることが主な理由と考えられた.3)群落光合成速度は日中の最も光合成が盛んに行われている時で,水稲個体群で8.8gCO_2/m^2h,大豆個体群で6.8gCO_2/m^2hであった.
Created Date 2012.06.30
Modified Date 2022.11.11

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