世界遺産宮島の森林を教材にした小中大学連携 : 宮島ロープウエー駅舎付近の植生回復を例に

Itsukushima (Miyajima) Island is a UNESCO World Heritage site in Japan. The site consists of Itsukushima Shinto Shrine and a natural forest in Mt. Misen. In 1962, a pack of Japanese macaque (Macaca fuscata) from Shodoshima Island of Kagawa Prefecture, Shikoku, was introduced for a tourism resource near Shishiiwa Terminal by Miyajima Ropeway Company. After the introduction, the forest area was decayed because of use by the macaques as well as gathering by Japanese sika deer approaching the macaques for feeding. Recently, the macaques were moved to Okazaki Monkey Center in Aichi Prefecture to protect the forest area. In 2016, the heritage site was in the twentieth anniversary of the opening and over 4 million tourists have visited every year; on the other hand, depopulation and aging are progressing in the island. In 2014, a plan was started to restore the original vegetation of the forest near the terminal and to prevent debris flows. The plan was also used as a teaching material in association with environmental education for Miyajima Elementary and Junior High Schools (Miyajima Combined School), one of the UNESCO Associated Schools, in collaboration with Miyajima Natural Botanical Garden of Hiroshima University. Seedlings from many species collected from the natural forest were used and cultivated through the educational program. The program would be continued at least 10 years to foster love of nature as well as hometown of the younger generation to weaken the depopulation trend

Checklist of vascular plants of Kui Block Field, Mihara City, Hiroshima Prefecture, Japan

広島県三原市久井町に位置する久井岩海は国の天然記念物に指定されている。今回，久井岩海の天然記念物調査に際し，維管束植物（シダ植物，裸子植物，被子植物）のフロラの見直しを行う機会を得た。本稿では，標本および文献にもとづいて久井岩海および周辺地域の維管束植物フロラをまとめた。その結果，維管束植物合計415種（ヒカゲノカズラ植物1種と狭義シダ植物36種，裸子植物6種，被子植物372種。ただし，種以下の下位分類群や雑種は種として数えた）が生育していることが確認された。Kui Block Field, Mihara City, Hiroshima Prefecture, SW Japan is designated as a national natural monument. In this study, a checklist of the vascular plants recorded from Kui Block Field is provided, based on previous publications, herbarium specimens and our recent investigations. 415 species of vascular plants are recorded, consisting of 1 species of lycopods, 36 species of pteridophytes, 6 species of gymnosperms, and 372 species of angiosperms

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

近年，豪雨などの自然災害が頻発しており，平成30年7月豪雨は西日本の広い範囲で甚大な被害をもたらした。広島県廿日市市宮島でも複数か所で土砂災害が発生し，その復旧工事の際の緑化工が行われた。宮島の場合，世界遺産に登録される前からさまざまな法律の規制を受けており，その復旧にはさまざまな制約が存在する。また，広島県の保存管理計画が策定されており，生物多様性の保全を念頭においた施工が求められる。本稿では2か所の緑化地区について，地域性種苗を用いた緑化工を実施した。植えつけ作業は2019年3月から4月に行われた。2019年12月の時点で，両地区で草本と木本をあわせて116種の維管束植物（帰化植物を含む）が確認された。また，樹木の苗は最大で約3 mの樹高まで成長が確認されている。今後，当初目標としていた植生にどの程度近づくのか継続調査を行う予定である。本事業で得られる基礎的な知見は，今後保全地域での緑化の際に参考になる情報である。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