ブナ・ミズナラ林における遷移過程の解析

抄録

The deciduous broadleaved forests dominated by beech (Fagus crenata) and oak (Quercus crispula) are found widely in the cool temperate mountains of Japan. The oak forest has been regarded as a seral forest succeded by the beech climax forest. 1) Three stands in the beech-oak forests of Okutama near Tokyo were researched comparatively by the author, and the process of ruin and rise between the oak and beech is illustrated in Fig. 2. The typical beech forest (C) might be regarded as stable for a long time, because there grew a great number of young beeches, while the oak forest (A) is regarded as unstable because it had none of its own inheritors, but beech ones. This fact shows clearly that the oak forest would be gradually succeeded by the beech forest with the progress of time. 2) In order to analyse such a process of succession mentioned above, the author applied the analytical method of MONSI and OSHIMA (1955). On the basis of the mutual action between the main physiological action of plants (production of matter-photosynthesis) and the main environmental condition in a forest (light intensity), the height-growth curves of young trees of oak and beech in the forest communities of various densities were calculated and drawn as shown Figs. 6 and 7. The fact of young trees under the Sasa-layer in the forest was also discussed.