2023 Fiscal Year Final Research Report

Importance of the belowground ecosystem determining the vegetation succession after the eruption on Kuchinoerabu-jima Island in 2015

Research Project

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Project/Area Number	19H03003
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 40010:Forest science-related
Research Institution	Kindai University
Principal Investigator	Hayasaka Daisuke 近畿大学, 農学部, 准教授 (20583420)
Co-Investigator(Kenkyū-buntansha)	川西基博鹿児島大学, 法文教育学域教育学系, 准教授 (50551082) 奈良一秀東京大学, 大学院新領域創成科学研究科, 教授 (60270899) 澤畠拓夫近畿大学, 農学部, 准教授 (80709006) 橋本洸哉国立研究開発法人国立環境研究所, 生物多様性領域, JSPS特別研究員 (90832436)
Project Period (FY)	2019-04-01 – 2023-03-31
Keywords	生態遷移 / 生物間相互作用 / 火山噴火 / 菌根菌 / 島嶼生態系 / 回復ポテンシャル / レジリエンス / 攪乱生態学
Outline of Final Research Achievements	Sites of the 2015 eruption on Kuchinoerabu-jima Island, Kagoshima Pref., Japan, showed the vegetation succession that arbors, in particular Pinus thunbergii, was dominant earlier than the pioneer species soon after the event. To clarify mechanisms of its unique successional sequence, we obtained not only vegetation data but also the below-ground biocenosis including buried seeds, ground-dwelling arthropods, and mycorrhizal fungi. Main results are as follows: (1) the effects of the pyroclastic flow on a soil seed bank was relatively small but there were many plant seeds that deer does not preferably feed in the sites, (2) the legacy effects of pre-eruption vegetation on terrestrial arthropod communities after volcanic disturbance differed depending on the type of disturbance, and (3) the seedling establishment of P. thunbergii soon after the eruption may be largely supported by ectomycorrhizal fungi, with negligible effects of arbuscular mycorrhizal fungi and dark septate endophytes.
Free Research Field	生態リスク学、緑化工学
Academic Significance and Societal Importance of the Research Achievements	本研究の意義は，火山噴火後の植生遷移過程について，単に地上部の植生のみで評価するのではなく，地下部のサブシステム（埋土種子，土壌動物，菌根菌）との関係性に注目して，評価を試みようとする点にある。なかでも，菌根菌を介した植生形成の可能性については，これまでほとんど議論されておらず，本知見が古典的な遷移概念の再定義に向けた第一歩となり得る。