Present distribution and historical background of the invasive alien species Robinia pseudoacacia on former coalmine land in Hokkaido

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  • 北海道の旧産炭地における侵略的外来種ニセアカシアの分布現況とその歴史的背景
  • ホッカイドウ ノ キュウ サンタンチ ニ オケル シンリャクテキ ガイライシュ ニセアカシア ノ ブンプ ゲンキョウ ト ソノ レキシテキ ハイケイ

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Abstract

Robinia pseudoacacia is an invasive alien tall tree species in Japan. This study evaluated the spatial distribution of R. pseudoacacia and its historical background in Bibai, a former coalmining region in central Hokkaido. Using satellite images and a field survey, the area of R. pseudoacacia stands totaled 0.989km^2 in the 100km^2 investigated (10×10km). Interpreting historical aerial photographs taken in 1962, 1973, 1982, and 1993, the location of each R. pseudoacacia stand was classified into six types of land use. Historically, much of the land was once cut or used for crops. Cut forests were reforested quickly between 1962 and 1972. Crop fields and coalmines were reforested gradually between 1962 and 1993. Of the forest without R. pseudoacacia that neighbored Robinia stands, forests that had not been cut or otherwise used constituted 25.0%, which is significantly greater than the 11.7% containing Robinia stands. This implies that it is difficult for Robinia to spread into undisturbed forests. The results strongly suggest that the lack of management of plantations, abandoned crop fields, and vacant sites at former coalmines contributed to the rapid spread of R. pseudoacacia in the study area.

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