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Seedling stage of 2 subalpine abies species in distinction from sapling stage a matter economic analysis



Seedling stage of 2 subalpine abies species in distinction from sapling stage a matter economic analysis



Botanical Magazine Tokyo 96(1041): 49-65



A growth analytical study is made on the seedlings of A. mariesii Mast. and A. veitchii Lindl. in the subalpine climax Abies forests of the northern Yatsugatake Mountains, central Japan. Seedlings are distinguished from saplings by the absence of the fully expanded lateral branch system. The high dependence of assimilation on new needles characterizes the lives of seedlings. Leader shoots of seedlings, resembling not leader shoots but lateral branch shoots of saplings, have shoot characters adaptive for assimilation. Seedlings grow into saplings at 20 cm in height and 5 g in dry weight. The matter-economic analysis suggests the existence of a boundary growth rate below which an individual cannot maintain the needle amount requisite for its survival (called the critical growth rate) and that above which an individual can easily enter the sapling stage due to higher allocation of assimilate to roots and aged trunk stem (the capacity growth rate). Forest floor seedlings suffer a high mortality during their initial years and scarcely grow to enter the sapling stage, because of the scantiness of their matter production. In the regeneration patterns of subalpine Abies forests, both the seedling bank type and the sapling bank type are recognized.

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Accession: 006379119

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