トウモロコシ個体群における吸光係数の構成要素としての単葉の光透過率と草型の検討

概要

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1) Variety Koh No. 7 of corn plant with 3 different planting densities (5, 10 and 20 cm intervals) was grown in green house to study the status of light extinction in the canpy. Light extinction coefficient K in Monsi and Saeki's formula can be divided into following two components according to Monteith's model (1965). One is light transmission rate through d single leaf (τ_λ) and another is a parameter S representing the average arrangement and orientation of the leaves. S is the fraction of incident radiation that passes through a layer without being intercepted by any leaf or stem. 2) Stratified clip method was adopted at regular intervals to estimate light extinction coefficient K. Light intensity under the canopy was mesured with sillicon blue cell (SBC) covered with infrared absorbing filter. 3) Light transmission rate through single leaf (τ_λ) was measured with a spectro-photometer (Hitachi EPS-3T type) using jointly the integrating sphere and an opal glass in order to apply to Monteith's model. 4) According with the increase of planting density and the advance of growth stage, light extinction coefficient K declined and light transmission rate (τ_λ) through single leaf were enhanced. However, being on Monteith's model, it became clear that the light transmission rate (τ_λ) scarcely affected light extinction coefficient K, whereras the parameter S played an important role in K.
日本作物学会の論文