知床国立公園における針広混交林の動態シミュレーションモデル

概要

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Stand structure and growth dynamics of a mixed forest in the Shiretoko National Park were investigated in two plots of 1600 m^2 between 1989 and 1993. The stand was dominated by a conifer, Abies sachalinensis, and the hardwood species Quercus mongolica var. grosseserrata. The size structure of both groups showed inverse J-shaped distributions. The diameter growth of the coniferous and hardwood species was independent of size. Tree death in hardwood species occurred in small size classes (diameter at breast height, DBH<10 cm), whereas various size classes of coniferous species were affected. The effect of upper tree density (one-sided competitive effect) on the absolute growth rates of conifer trees was significant over a wide range of size classes (0<DBH<15 cm), but this was not the case for hardwood trees, except in the intermediate size classes (5<DBH<10 cm) of the subcanopy layer. A matrix model simulation showed that the size structure dynamics of conifer and hardwood species was governed mainly by a one-sided density effect, and by recruitment of seedlings or saplings, respectively.
日本生態学会の論文