Kagoshima University · Division of Agricultural Sciences, School of Agriculture, Fisheries and Veterinary Medicine · 准教授

Research keywords種多様性・炭素循環・Japonica・安定同位体・外生菌根菌・細根形質・Ecology・Agronomy

Research fields森林生態学・気候変動・種多様性・育林学

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• Hassan HI, Hiejima S, Ugawa S2026 · 担当区分： 最終著者, 責任著者 記述言語： 英語 掲載種別： 研究論文（学術雑誌）
• Uchiyama C., Azuma W.A., Enoki T., Takagi M., Ugawa S., Ishii H. . Climate-Growth Response of Cryptomeria japonica Cultivars in Southwestern Japan . Forest Science 2026年2026 · 記述言語： 英語 掲載種別： 研究論文（学術雑誌） 出版者・発行元： Forest Science Understanding how tree growth responds to climate is important for predicting how plantation forests may react to ongoing climate change. In this study, we examined the climate–growth relationships of six Cryptomeria japonica cultivars across five common-garden sites in southwestern Japan using dendrochronological methods. We analyzed 48 years of ring width data to evaluate how monthly and annual temperature and precipitation affect radial growth at site and cultivar levels. Static and moving correlation analyses revealed that late winter to early spring temperatures (February–March) positively influenced radial growth at most sites, likely by facilitating cambial reactivation, while high summer precipitation tended to suppress growth at some sites, possibly through reduced solar irradiance. Precipitation effects were variable across sites, with autumn rainfall showing positive effects at lower-elevation sites. At the cultivar level, early-growth type cultivars tended to show positive temperature responses, while late-growth types showed more variable precipitation responses, though the majority of cultivar-level correlations did not reach statistical significance. Multivariate ordination (PCA) and permutational multivariate analysis of variance (PERMANOVA) on correlation-based response profiles indicated that geographic location was a significant driver of climate-growth response patterns (R² = 0.28, p = 0.014), while cultivar type explained a substantial but non-significant proportion of variance (R² = 0.23, p = 0.085). These results suggest that local environmental conditions primarily shape climate sensitivity in C. japonica, while genetic provenance provides an additional, non-negligible layer of variation. Our findings underscore the importance of considering both site characteristics and cultivar characteristics in forest management and climate adaptation strategies for C. japonica plantations. DOI： 10.1007/s44391-026-00066-8 Scopus
• Ugawa S, Kawanishi M, Watanabe S, Tagane S, Hachisuka R, Hiejima S, Emura N, Fujita S, Kawai K, Aiba SI, Suzuki E . Changes in stand structure and tree species diversity by forest age on ridge2025 · 担当区分： 筆頭著者 記述言語： 英語 掲載種別： 研究論文（学術雑誌） DOI： 10.1080/13416979.2025.2548096
• Enoki T., Ugawa S., Ishii H. . Allocation of aboveground net primary production and nitrogen use in 45-year-old clonal plantations of Cryptomeria japonica in southern Japan . Journal o2025 · 記述言語： 英語 掲載種別： 研究論文（学術雑誌） DOI： 10.1080/13416979.2025.2598157 Scopus

• 世界自然遺産候補地奄美群島の森林生態系に関する基礎的研究
• DNA定量法を用いた新たな細根バイオマス量の測定手法の開発
• 木部通水組織の機能形質変異から気候変動に対する樹木の生理的順化能力を評価する
• 多種樹木の窒素獲得戦略の解明とそれに基づく窒素循環プロセスモデルの構築

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