茎による光の吸収〔英文〕

概要

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To assess the amounts of light intercepted by leaves and stems separately, light profiles before and after artificial defoliation were observed in some pure communities of the weed, dwarf bamboo and shrub, and correlated with the vertical distributions of various leaf and stem dimensions such as leaf area index (LAI), stem surface area index (SAI), cross-sectional area of stems, etc. The total LAI and SAI in the communities were 3.1〜8.4m^2/m^2 and 1.6〜2.7m^2/m^2 respectively. Observed values of the relative light intensity at a given height z in a plant community before defoliation or I(z)/I_0 and that after defoliation or I_c(z)/I_0 led to the estimate of the relative amount of light intercepted by the leaves alone, I(z)/I_c. Both I(z)/I_0 and I(z)/I_c were found to depend upon the cumulative LAI above z-height or F(z), following the Beer-Lambert's law, viz. I/I_0=exp(-KF) and I/I_c=exp(-K_FF). On the other hand, stems alone intercepted 28〜69 per cent of the total incident light, and I_c(z)/I_0 was most closely correlated with the summed area of the stem cross sections at z-height, A(z), viz. I_c/I_0=exp (-K_cA). Based on these correlations, it was concluded that the three coefficients of light extinction, K, K_F and K_c were interrelated according to the formula, K=K_F+aK_c, which reasonably explained the role of the leaves and stems in the interception of light in terrestrial plant communities.
日本生態学会の論文
1969-12-01