Habitat of <I>Picea koyamai</I> Shirasawa and <I>Picea maximowiczii</I> Regel ex Mast

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  • Note H.
    Graduate School of Science and Technology, Chiba University Environmental Technology Department, Kankyo Engineering Co., Ltd.
  • Okitsu S.
    Department of Environmental Science, Faculty of Horticulture, Chiba University
  • Momohara A.
    Department of Environmental Science, Faculty of Horticulture, Chiba University

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  • ヤツガタケトウヒとヒメバラモミの生育立地
  • ヤツガタケトウヒ ト ヒメバラモミ ノ セイイク リッチ

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Abstract

Habitat of Picea koyamai, Picea maximowiczii and their cohabiting tree species (Tsuga diversifolia and Abies homolepis) were studied at 64 sites on Mt. Mikobuchi (1, 3001, 800 m in elevation), central Honshu, Japan. T. diversifolia dominated throughout the forest with the relative basal area of 25%, followed by A. homolepis. P. koyamai and P. maximowiczii amounted to almost 14% of the relative basal area of the forest. The trees (more than 2 m in height) of P. koyamai and P. maximowiczii both concentrated only on the steep block slopes more than 36°in inclination and more than 31% of the rock cover, while those of T. diversifolia showed no habitat preference. The trees of A. homolepis grew on the sites with fertile soil and less than 20% of rock cover. The seedlings (less than 50 cm in height) of P. koyamai and P. maximowiczii survived only on the rock surface near the parent trees, while the seedlings of T. diversifolia and A. homolepis survived abundantly on fallen logs and stumps, and on humus, respectively. It was assumed that both of P. koyamai and P. maximowiczii hardly maintained their population on the sites other than the steep block slopes with their parent trees.

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