Revegetation work after natural disasters in conservation areas: a case study of the greening project in restoration work for torrential rain disaster caused by the July 2018 heavy rainfall in Miyajima Island, Hiroshima Prefecture, Japan

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  • 保全地域での自然災害後の緑化工について : 広島県宮島で発生した平成30年7月豪雨災害復旧工事での緑化事業

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Abstract

In recent years, the frequency of natural disasters has increased, such as the torrential rains in July 2018 (2018 Japan Floods), which caused extensive damage in western Japan. In Miyajima (Itsukushima) Island, Hiroshima Prefecture, landslides occurred in several places, and revegetation was carried out during the restoration work. Even before its designation as a World Heritage Site, the restoration work on this island was regulated by several laws involving various restrictions. In addition, Hiroshima Prefecture established a conservation management plan that required construction with the view of biodiversity conservation. The greening project was conducted at two damaged sites using local seedlings and seeds collected on the island. As of June 2019, 116 species of herbaceous and woody vascular plants (including both native and naturalized species) were confirmed at these two sites. Tree seedlings had grown to a maximum height of approximately 3 meters. In the future, we will continue the survey to determine the closeness of the vegetation to the initial target. The information obtained from this project will be beneficial for future revegetation in conservation areas.

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