継続的な伐竹によるモウソウチクの再生力衰退とその他の植生の回復

抄録

In order to discuss the effective method to control the bamboo forest expansion, we surveyed the former Japanese cypress forest which was seriously invaded by Phyllostanchys pubescens since after forest clearing through April to June in the shooting season, for 3 years under different cutting conditions namely summer selective bamboo cutting and repeatedly clear cutting. In every summer selective bamboo cutting stand, 3 years later, such pioneer species as Zanthoxylum ailanthoides and Mallotus japonicus grew thick at the height of about 7. 1m. Whereas bamboo shoots decreased and shrank due to the oppression and shading by these pioneer species, and disappeared completely in 2 years. On the contrary, in the repeatedly clear cutting stand, the small bamboo glass-like shoots were still seen even 3 years later. In the abandoned control stand, bamboo shoots generated year by year, and recovered the former bamboo forest.