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宝永山第三火口。
草本植物群落に木本植物(カラマツ、ミヤマハンノキ、シラビソ)が進入している様子がわかる。
(English)
Forms gap in the community of herbs and invited to grow woody plants
(Larix kaempferi, Alnus maximowiezii, Abies veitchii) on that area,
the forest is extending by this process on the bare-ground.