Study of vegetation transition on revegetated slopes for the evaluation of slope vegetation restoration and its process

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K23680
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0602:Agricultural and environmental biology and related fields
• Research Institution: Kagawa University (2020-2021); University of Human Environments (2019)
• Principal Investigator: Oyake Yui 香川大学, 創造工学部, 助教 (30846176)
• Project Period (FY): 2019-08-30 – 2022-03-31
• Keywords: 緑化法面 / 成立植生 / 遷移系列 / 土壌硬度 / タケ類 / アカマツ

Outline of Final Research Achievements

Vegetation and soil were surveyed on the artificial slopes of two expressways 47-50 years after construction in Kyushu and Tokai regions , and compared with the slopes on one expressway in Shiga Prefecture, where previous studies have surveyed vegetation transition and soil development. Although the progression of vegetation succession on the artificial slopes was considered to be influenced by the vicinity vegetation and temperature, the results indicated that deciduous broad-leaved forests tended to be established in approximate 50 years after construction. Soil development estimated from hardness showed that soil development tended to progress with the vegetation succession.

Free Research Field

緑化工学

Academic Significance and Societal Importance of the Research Achievements

緑化法面においては植生回復のほか、防災機能の確保、管理労力の削減といった面からも植生遷移の仕組みを利用した森林の成立が望ましいとされている。一方で緑化法面では使用する緑化技術や資材の影響で成立植生が自然環境下における森林成立の過程とは異なる傾向を示すことも示唆されている。本研究において極力人為影響を抑えた、牧草播種による初期の表土安定のみを行った法面の成立植生の変遷を示すことで、緑化技術や資材が成立植生に与える影響を比較検討できるようになる。