The Regeneration of Tural Forests on Hokkaido, Northern Japan

27 Mar The Regeneration of Tural Forests on Hokkaido, Northern Japan

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Abstract

北海道内で行われたかき起こし林分の調査資料を用いて, 1) 種組成•種多様性, 2) 樹高成長とそれに影響する環境要因, 3) 緊密度, に関してかき起こし林分の特徴を明らかにした。多くのかき起こし林分でダケカンバが優占し, 種多様度は低かった。かき起こしダケカンバ林分の樹高成長は非かき起こしダケカンバ林分より大きかった。かき起こしダケカンバ林分の樹高成長は気候的に湿潤な地域で大きく, 斜面の下部で大きかった。多くのかき起こし林分は過密状態にあった。これらの結果に基づき, 多様な樹種構成をもつ森林や大径材を生産する森林の再生を可能にするかき起こし施業の高度化にむけて, 生態学が貢献できる研究課題を明らかにした。

English Abstract

The characteristics of forest stands regenerated by scarification were evaluated in terms of 1) species composition and species diversity, 2) height growth and environmental factors influencing the height growth, and 3) compactness, using data from a large number of plots on Hokkaido, northern Japan. In most of the plots, Betula ermanii was domi nt, and species diversity was low. B. ermanii was taller in stands that were regenerated by scarification than in stands that were regenerated in other ways. Site index was larger in regions with humid climates and on lower slopes. Most stands were overcrowded. Based on these results, several ecological problems that need to be solved to increase the versatility of scarification are presented.