国営武蔵丘陵森林公園において36年間に生じた森林植生の変化と管理及び地形の関係

概要

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In this study, the relationship between vegetation changes, forest management, and topographic factors were analyzed in order to clarify the long-term trends in vegetation changes in the satoyama ; this analysis was performed by comparing the vegetation maps that were created in 1971 and 2007. From 1971 to 2007, 64% of Pinus densiflora forestation has been converted into Quercus serrata forestation in the Musashi Kyuryo National Government Park. As a result, only 39% of shinned P. densiflora and 20% of non-shinned P. densiflora are currently found in the forest. The electivity index for each pattern of vegetation change with respect to topographic factors was analyzed for the unregulated P. densiflora forest in 2007. The results indicate that the P. densiflora vegetation present on the ridges was better maintained than that on the slopes. Moreover, it was evident that Pleioblastus chino tends to grow more on the slopes and valleys than on the ridges. P. chino grows as a bush among Quercus myrsinifolia Blume trees and prevents the growth of Q. myrsinifolia seedlings. Hence, the succession of the Q. serrata vegetation on the slopes and valleys may not be likely.