空中写真を用いた竹林の分布拡大速度の推定 : 滋賀県八幡山および京都府男山における事例

概要

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Range expansion of the bamboo species, Phyllostachys pubescens, was studied using aerial photographs in the Mt. Hachiman area (1975〜1982), Shiga Pref. and Mt. Otoko area (1974〜1987), Kyoto Pref., Central Japan. Scores of unmanaged bamboo patches have a mosaic distribution among secondary forests of Pinus densiflora and/or Quercus serrata in both areas. First, changes in the area of each bamboo patch were measured. Most bamboo patches had expanded and some of them had combined together. Consequently, the total area of bamboo stands increased in both areas, whereas the number of bamboo patches decreased. Then, the annual rate of range expansion was estimated; the average for 29 patches in the Mt. Hachiman area was 2.56 m/yr. and the average for 48 patches in the Mt. Otoko area was 1.96 m/yr. These values were similar to the results of several previous studies. The conditions of the expanded sites were then compared with those of non-expanded sites. A significant difference in vegetation factor was seen between them; surrounding vegetation was more sparse in the expanded sites, and tend to be the more sparse the vegetation was, the larger the expansion rate tended to be.
日本生態学会の論文
1998-04-25