2022 Fiscal Year Final Research Report

The Plant selection and the planting design for rain gardens which can contribute to the mainstreaming Green Infrastructure in Japan

Research Project

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Project/Area Number	20K20687
Research Category	Grant-in-Aid for Challenging Research (Exploratory)
Allocation Type	Multi-year Fund
Review Section	Medium-sized Section 1:Philosophy, art, and related fields
Research Institution	Kyoto University of Advanced Science
Principal Investigator	Ano Akihide 京都先端科学大学, バイオ環境学部, 嘱託講師 (70817642)
Co-Investigator(Kenkyū-buntansha)	森本幸裕京都大学, 地球環境学堂, 名誉教授 (40141501) 山下三平九州産業大学, 建築都市工学部, 教授 (50230420)
Project Period (FY)	2020-07-30 – 2023-03-31
Keywords	雨庭 / Rain Gardens / グリーンインフラ / Planting Design / Plant selection / Xeric rain garden / 多年生草本 / Ecological Planting
Outline of Final Research Achievements	We selected candidates mainly from plant species that have been used for rain gardens in Europe and the US and their close relatives, which are native species in Japan, and verified their resistance to cyclical floodings. As a result, 16 plant species that can be used for a typical depression type rain garden and 10 species that are suitable for a pore retention type rain garden using thick gravel mulch were confirmed. In addition, the weed control effect of the pore retention type was also confirmed. Through this research, experimental systems and evaluation methods (evaluation by visual observation, chlorophyll fluorescence, and chlorophyll content) for selecting greening plants suitable for rain gardens were established. It was actually implemented on a private site in Fukuoka Prefecture, and the suitability and weed control effect of plants could be verified. It also suggested the possibility that ecological planting using perennial herbs will be favorably accepted by citizens.
Free Research Field	雨庭、緑化工学、ランドスケープアーキテクチャー
Academic Significance and Societal Importance of the Research Achievements	雨庭の主流化のために蓄積すべき知見の一つに緑化植物リストの作成がある。本研究では植物種の選定実験を通して実験系と評価手法を確立することができた。また、生態系サービスの享受や生息域外保全の観点から多年生草本の活用の推進は重要だが、維持管理を低減する技術が不可欠である。実験と実装による検証により、欧米で開発された空隙貯留型雨庭が我が国でも有効であり一つの解決策となることが示された。デザイン面では、世界的な潮流となりつつある多年生草本を主役にしたEcological Plantingが市民に好意的に受け入れられ得ることが示唆され、生物多様性に配慮した雨庭を推進するために重要な知見が得られたと言える。