成ヶ島における塩性湿地に着目した植生の変化と環境管理活動との関係

概要

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This study aims to investigate the shape of future salt marsh vegetation management by using Narugashima, located 100 meters off of southeast Awaji Island, Western Japan, as the study area. We examined the relationship between the changes in vegetation, especially salt marshes, over the period from the 1960s to the present and the environmental management activities conducted on the island for about 50 years. The results showed that the natural landscape of the island mainly consisted of Japanese black pines in the 1960s, but now they have mostly vanished. At present, the pines have been replaced by salt marshes and groves of Ubame Oak (Quercus phillyraeoides). This study revealed that logging and damage by pine weevils contributed to the decrease in the trees, and that environmental conservation activities by local residents increased from around 1990, leading to the creation of the landscape consisting of salt marshes on the island.