群落光合成の半経験的評価法の改良 : 第2報とくに水稲個体群植被内における光と個葉光合成の光飽和値P_<max>の分布について

概要

論文の詳細を見る
The profiles of light intensity and light saturated value of photosynthesis, P_<max>, in the rice canopy were observed from tillering stage to ripening stage. Using the parameters obtained from the observation, the theoretical values of dry matter production estimated by the semiempirical model were compared with the values obtained by biomass method. Results were summarized as follows: 1. Light attenuation in the canopy was approximated well using either exponential law (I=I_0e^<-KF>) or reciprocal law (I=I_0/(1+kF)). Light attenuation cofficient k became larger with growth stage. 2. P_<max> decreased with accumulated LAI, F increasing and linear relation was found between P_<max> and F. P_<max> at the top of the canopy (P_<max>, _H) and vertical gradient of P_<max> in the canopy became smaller after the heading stage. 3. Using the Uchijima's model for estimating the total photosynthesis and dry matter production of rice stand, we found that the theoretical values almost coincided with the values obtained by biomass method. But, assumed that the foliage was constructed with upper active leaves, the theoretical dry matter production was considerably overestimated.
日本作物学会の論文
1975-09-30