箱根ポーラ美術館に植栽された広葉樹15種の11年間の生長動態

－太平洋側におけるブナ林の再生を目指して－

抄録

The growth behavior of fifteen broad-leaved tree seedlings was investigated during 11 years in order to convert a Chamaecyparis obtusa Seib. et Zucc. plantation into beech: Fagus crenata Bl. forests in the Hakone region on the Pacific Ocean side of Japan. The survival rate of all planted seedlings is 66.9%, and for Fagus crenata supplementary planting, 37.7%. The average height of Prunus jamasakura Seib., Quercus mongolica Fischer var. grosseserrata Miq., Fagus crenata was 842cm, 666.3cm, 205.8-275.0cm after planting 10-11 years, respectively. The stratification of planted trees formed almost three layers depending on the difference of primary growth speed. Although several species of seedlings were planted which had a differential growth behavior, Fagus crenata showed approximately equivalent or slightly lower average height than in previous studies. As concerns improvement of the forest structure, it expected to grow more Fagus crenata to promote thinning of the planted trees in the upper layer.