| 要旨トップ | 目次 | 日本生態学会第67回全国大会 (2020年3月、名古屋) 講演要旨
ESJ67 Abstract


一般講演(口頭発表) N01-08  (Oral presentation)

Application of bamboo biomass resources in agrochemical-free rice farming: effects on Odonata diversity

*Thien Quang HUYNH(Kanazawa University), Masayuki K. SAKATA(Kobe University), Shinya NOMURA(Kanazawa University), Ryohei NAKAO(Kobe University), Toshifumi MINAMOTO(Kobe University), Masfiro LAILATI(Kanazawa University), Nisikawa USIO(Kanazawa University)

A project is underway to investigate the effectiveness of ground bamboo (GB) application on rice production (P2-PC-342). In this study, we evaluated effects of GB application on paddy field biodiversity using Odonata as an indicator. We conducted field experiments using 16 experimental paddies comprising five treatments with 3–4 replicates each: control, manual weeding, low-volume (0.5t/10a), medium-volume (1.0t/10a) and high-volume (2.0t/10a) GB applications. During the summer, we carried out weekly exuviae sampling and environmental DNA (eDNA) analyses. At given times, greater numbers of Odonata taxa were identified by eDNA relative to exuviae analyses. eDNA analyses showed no significant difference in Odonata richness among treatments, whereas exuviae analyses revealed lower Odonata richness in the high-volume GB treatment relative to other treatments. Specifically, the emergence rates of three Libellulidae dragonflies were low or zero in the high-volume GB treatment. In contrast, the emergence rates of Anax parthenope (Aeshnidae) were highest in the high-volume GB treatment. These results suggest that application of ground bamboos have mixed effects on Odonata emergence rates depending on taxa and volumes of GB applications. We will discuss potential mechanisms for effects of GB applications on Odonata emergence with regards to aquatic plant diversity, oxidation-reduction potential and species interactions


日本生態学会