光環境對稻作生產之影響
Other Title
The Effect of Light Environment on Rice Production
Journal
環境與稻作生產
Pages
53-67
ISBN
957-02-3913-1
Date Issued
1999-06
Date
1999-06
Author(s)
蔡金川
Jin-Chuan Tsai
Abstract
本文主要探討兩部份：1.光強度、光質對水稻光合作用及其相關生理特性之影響。2.光環境（受光態勢、遮光）對乾物質生產之影響。第1部份在於說明光強度與水稻光合作用之關係，乃呈現雙曲線關係。水稻的氣孔抵抗因光能量的增加，出現指數函數減少的趨勢。水稻亦具有Emerson的增進效果現象，即光I（大於約685nm長的波長）與光H（小於約685nm的短波長）同時照射的光合作用速率，比這些光單獨照射的（光合作用速率）還大。第2部份是探討水稻株型會影響群落之受光能率，葉片直立，短等理想株型有利於群落之受光能率。另外，水稻生育過程中，減數分裂期及乳熟、糊熟期若遇寡日照（遮光），不利於乾物質生產與產量。
This chapter reviews two parts. The first part discusses the effect of light intensity and light quality on photosynthesis and physiological characteristics in rice plants. The relationship between light intensity and photosynthesis is hyperbolic. The stomatal resistance decreases in an exponential function with increasing light intensity. The photosynthetic rate of rice plants shows the Emerson effect. It indicates that the combination of photosystem I (>685nm) and photosystem II (<685nm ) makes higher photosynthetic rate than the single system. The second part discusses about the light reception of rice population. The ideal plant type of rice variety has the small leaf angle and the short leaf with lower light extinction coefficient. It appears that this type of rice plant has more light intensity among the varietal community. The period of shading is found to be critical to the decrease of
dry matter production and yield. The first critical period is at the meiosis stage and the second is at the milky and dough stage.
Subjects
光強度
光合作用速率
株型
遮光
乾物質生產
產量
Dry matter production
Light intensity
Photosynthetic rate
Plant type
Shading
Yield
Publisher
臺灣省農業試驗所、中華農業氣象學會
Type
book chapter
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