Photosynthetic responses to light intensity of deciduous broad-leaved tree seedlings raised under various artificial shade.
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概要
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The light-photosynthesis curve of the seedlings of two species of <I>Betura, Quercus</I>, Acer, and two kinds of <I>Fraxinus</I> grown under three light levels was compared in relation to their specific leaf area (<I>SLA</I>) . With deeper shade, the <I>SLA</I> showed a increase, the largest in both <I>Fraxinus</I>, and the smallest in two kinds of <I>Betula</I>. The half-saturation of photosynthesis of all tree species occurred in a low photosynthetic photon flux density (PPFD), with deeper shade, especially in <I>Quercus</I>. With a reduction of PPFD, the initial slope of the light-photosynthesis curves of two species of <I>Betula</I> showed a slight steepness, whereas that of the other tree species showed a great steepness. The dark respiration rate of leaves of all tree species decreased with a deepening of shade. The photosynthetic acclimation of both <I>Fraxinus</I> was the greatest; this may be advantageous to surviving under a gap created in forest canopy. Two species of <I>Betula</I> had the smallest photosynthetic acclimation to shade, and this characteristic may imply that they can not survive under shaded conditions. The acclimation to shade of <I>Quercus</I> and <I>Acer</I> was observed not in the <I>SLA</I>, but in the photosynthesis; this might be an advantage for conserving photosynthates for expanding leaf area in shaded environments.
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