Conservation status and challenges for flower landscape of Japanese Iris (Iris laevigata) in Japan

Conservation status and challenges for flower landscape of Japanese Iris (Iris laevigata) in Japan
発表者/presenter’s name:〇Satoshi, OSAWA 1,Ayano, OKUDA 1
所属/Affiliation:1 College of Bioresource Sciences, Nihon University


The flower landscape of Iris laevigata colony, a native wildflower species growing in wetlands, has been considered an aesthetic object in Japan since ancient times. The combination with Yatsuhashi, a zigzag bridge, in particular, has been widely used as a waterscape in Japanese gardens. However, due to development, few large wild I. laevigata populations remain today. We therefore surveyed the conservation status of the major remaining I. laevigata colonies in Japan and examined the challenges they face. We surveyed nine famous colonies, which were located on mountainous and highlands, plains, and margins of basin. The size of the colonies ranged from 100 m2 to 3 ha. Interviews with management groups at each site indicated that the size of colony was perceived to be declining at several colonies. Factors that inhibited growth were extracted, including feeding damage by deer, unstable water supply, and competition with other plants. Although there are several areas designated as national or prefectural natural monuments, stable growing environments were rarely maintained. There were several sites where local residents were involved in weeding and other conservation activities, which were considered to have become a source of identity for the local residents as a proud local landscape. The conservation of the I. laevigata colony is important not only for species protection, but also as the prototype of a flower landscape spread over a flat surface by wildflowers in Japan, and knowledge must be accumulated for appropriate management.

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