被陰条件下で育てたスギ, ヒノキ苗木の被陰解除前後の光合成特性と成長

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The growth of Cryptomeria japonica D . DON and Chamaecyparis obtusa (SIEB. et ZUCC.) ENDL. seedlings before and after release from shaded conditions was studied along with the changes of photosynthetic activity and the amounts of leaves on three artificially shaded treatment plots and one exposed plot. The photosynthetic rate of detached leaves was measured using the fiowing-gas technique in the autumn of 1987 (under shaded conditions) and again in 1988 (after release from the shaded conditions). Regarding changes of photosynthetic activity after release from shaded conditions, both C. japonica and C. obtusa had the same tendencies. The photosynthetic capacity of leaves adapted to shaded conditions, even slightly shaded conditions like 31% of relative light intensity, apparently became of a smaller value than the one of leaves adapted to open conditions. The current-year leaves emerging after the release from shaded conditions had a small difference in photosynthetic activity compared with those of other past shaded conditions. Regarding the increment rate of the amount of leaves of a seedling after release from shaded conditions, C. japonica's was larger than that of C. obtusa's, especially on the plots whose shaded conditions were severe like 3%, and 6% of relative light intensity. After release from shaded conditions, the annual diameter growth rate of the seedlings became greater than those under shaded conditions, and their degree of increase was related closely to the increment rate of the amount of leaves more than that of the photosynthetic activity.
日本森林学会の論文
1991-07-01

被陰条件下で育てたスギ, ヒノキ苗木の被陰解除前後の光合成特性と成長

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