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Faculty of Agriculture Region of Forest Environment and Sustainability Sciences Center for Innovative Agriculture |
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TAKAGI Masahiro
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Research Areas 【 display / non-display 】
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Life Science / Forest science
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Environmental Science/Agriculture Science / Environmental dynamic analysis
Papers 【 display / non-display 】
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Variation in fine root production across four different forest types in Japan Reviewed
Hirata M., Abe H., Enoki T., Nakaji T., Noguchi K., Ishihara M.I., Ohashi M., Ishii H., Yamagawa H., Takagi M., Matsumoto K., Katayama A.
Forest Ecology and Management 618 2026.10
Publishing type：Research paper (scientific journal) Publisher：Forest Ecology and Management
Climatic factors frequently account for global patterns of aboveground productivity in forest ecosystems, but the mechanisms regulating fine root production regionally remain unclear owing to limited standardized field data. We investigated fine root production within 16 forest plots distributed along a 2,500-km latitudinal gradient in Japan, comprising deciduous and evergreen broad-leaved natural forests and larch and Japanese cypress plantations. Fine root production was measured using an ingrowth core method in all plots and the relative importance of climatic, stand-level, and edaphic factors was evaluated. The mean fine root production was 166.7 ± 25.7 g m<sup>−2</sup> yr<sup>−1</sup>, with no significant differences observed across the four forest types. Fine root biomass exhibited significant positive effects, suggesting that fine root biomass provides a biological baseline for productivity. Conversely, stem density and soil nitrogen concentration significantly negatively affected fine root production. These findings are consistent with the optimal partitioning theory, in which trees reduce belowground investment as nutrient availability increases, and suggest that intense competition in high-density stands may constrain new root production. Our results demonstrate that regionally, stand structure and soil resource availability override macroclimatic constraints in regulating fine root production. Therefore, integrating stand structural complexity into predictive models is essential not only for accurately assessing forest carbon sink potential but also for developing effective, localized forest management strategies for climate change mitigation.
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Myat Paing A.M., Aihara T., Tsumura Y., Hirota M., Yoshida T., Homma K., Kobayashi H., Iio A., Tomaru N., Nagamatsu D., Takagi M., Tsuyama I., Hisamoto Y., Taneda H., Goto S.
Peerj 14 2026.8
Publishing type：Research paper (scientific journal) Publisher：Peerj
Climate change is expected to alter the growth and survival of forest trees, but the magnitude and direction of these effects remain uncertain at the intraspecific level, particularly across provenances adapted to contrasting climatic conditions. For Betula ermanii Cham., a dominant deciduous tree in cool-temperate and subalpine forests of Japan, it remains unclear how climatic mismatches between provenance origin and planting environment influence early-life performance. Here, we quantified the effects of climatic transfer distances on seedling performance using data from 11 provenance trials distributed across Japan. Performance was defined as a composite index integrating survival and growth (mean height × survival rate) at the provenance × site level. Generalized linear mixed models were used to evaluate the effects of temperature and precipitation mismatches, and the fitted models were applied to future climate scenarios based on Shared Socioeconomic Pathways (SSPs), specifically SSP2–4.5 and SSP5–8.5, to project changes in performance. Seedling performance showed a weak decline with increasing precipitation at the planting site relative to the provenance origin, while temperature responses varied substantially among provenances. This heterogeneity indicates strong genotype-by-environment interactions, with high-elevation central provenances showing greater sensitivity to warming, whereas northern provenances were comparatively less responsive. Under future climate scenarios, northern provenances generally maintained higher predicted performance in situ, while central provenances showed reduced performance at their origins but improved performance when projected into northern regions, suggesting potential for assisted migration. In contrast, the southern rear-edge provenance exhibited consistently low performance across scenarios, indicating limited adaptive potential under climatic change. Overall, our results demonstrate that responses to climatic mismatch vary among provenances, and that incorporating provenance-specific climatic sensitivity improves predictions of future performance. These findings emphasize the importance of provenance-based strategies for forest management, including the identification of climate-resilient source provenances, evaluation of assisted migration options, and conservation of genetically distinct but vulnerable provenances.
DOI： 10.7717/peerj.21425
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Climate-Growth Response of Cryptomeria japonica Cultivars in Southwestern Japan Reviewed
Uchiyama C., Azuma W.A., Enoki T., Takagi M., Ugawa S., Ishii H.
Forest Science 2026.5
Publishing type：Research paper (scientific journal) Publisher：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 (R<sup>2</sup> = 0.28, p = 0.014), while cultivar type explained a substantial but non-significant proportion of variance (R<sup>2</sup> = 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.
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Imaoka A., Hirata R., Ito S., Mitsuda Y., Takagi M.
Journal of Forest Research 31 ( 1 ) 1 - 6 2025.11
Publishing type：Research paper (scientific journal) Publisher：Journal of Forest Research
This study aimed to clarify the relationship between tree dimensions and tree damage (stem tilting, stem snapping, and falling down) after weeding (cleaning cutting) in a non-weeded 8-year-old hinoki (Chamaecyparis obtusa) stand in a warm-temperate region of Kyushu, Japan. We also performed an analysis to identify which tree dimensional characteristics were likely to cause fatal stem tilting and falling down after weeding. The first weeding in the study site was conducted 9 years after planting. We analyzed the relationship between tree damage and different tree parameters. Five out of 37 hinoki trees (14%) died after being impacted by competing plants felled by weeding, which suggests that the survival of planted trees immediately after weeding was influenced by contingent factors. Trees with a large height-to-diameter ratio (>137.2 m/m) and a tall height (>3.9 m) immediately after weeding tended to suffer from severe tilting in the year after weeding, which suggests that vulnerability to stem tilting is related to tree size and shape. According to our results, height-to-diameter ratio can be used as a criterion with tree height for considering the timing of weeding on hinoki plantations to avoid fatal stem tilting and falling down.
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Anatomical and ecological characteristics of Apostasia nipponica, a basal- most orchid, in light of high mycobiont dependence Reviewed International coauthorship
Hidetaka Umata, Stephan W. Gale, Masahiro Takagi, Yuki Ogura-Tsujita
鹿児島大学演習林研究報告 49 1 - 12 2025.3
Language：English Publishing type：Research paper (bulletin of university, research institution)
Books 【 display / non-display 】
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Ecology of Riparian Forests in Japan
S Ito, Y Mitsuda, GP Buckley, M Takagi（ Role： Joint author , section 20 ）
Springer 2008.9
Language：English Book type：Scholarly book
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森林フィールドサイエンス（共著）
全国大学演習林協議会（ Role： Edit）
朝倉書店 2006.4
Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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Site characteristics of Betula ermanii range-wide provenance trials
AYE MYAT MYAT PAING, CHEN Shufen, ARAKI Kyoko, AIHARA Takaki, SARMAH Ragini, HIROTA Mitsuru, TSUMURA Yoshihiko, TOMARU Nobuhiro, HOMMA Kousuke, KADOMATSU Masahiko, YOSHIDA Toshiya, KOBAYASHI Hajime, IIO Atsuhiro, OSUMI Katsuhiro, NAGAMATSU Dai, TAKAGI Masahiro, TANEDA Haruhiko, KIMURA Noriyuki, FUKUOKA Satoshi, HISAMOTO Yoko, GOTO Susumu
66 1 - 12 2022
Language：English Publishing type：Internal/External technical report, pre-print, etc.
DOI： 10.15083/0002005446
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全国大学演習林協議会・公開森林実習「日本の森を制覇しよう」 Invited
髙木正博
森林科学 ( 91 ) 2021.2
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
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大学演習林での教育研究ネットワークの最新動向 Invited
柴田英昭,高木正博 他
森林環境 2017.3
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
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南九州地方を代表するヒノキ壮齢林と常緑広葉樹二次林
髙木正博
グリーンエイジ ( 478 ) 2013.10
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media) Publisher：日本緑化センター
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種多様性に富む照葉樹林 ‐宮崎大学田野フィールド（演習林）
髙木正博
森林科学 ( 68 ) 28 2013.6
Language：Japanese Publishing type：Research paper, summary (national, other academic conference) Publisher：日本森林学会
Presentations 【 display / non-display 】
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南九州暖温帯林における渦相関法による二酸化炭素吸収量の測定
髙木正博
第137回日本森林学会大会 2026.3.18
Event date： 2026.3.16 - 2026.3.19
Presentation type：Oral presentation (general)
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南九州暖温帯林における渦相関法による二酸化炭素吸収量の測定
髙木正博
第81回九州森林学会大会 2025.10.24
Event date： 2025.10.24
Presentation type：Oral presentation (general)
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Measurements of canopy interception loss in an evergreen broadleaved forest and water storage capacity in various species
Abe Yuna, Shinohara oshinori, Takagi asahiro, Iida hin'ichi, Tanaka obuaki, Kume omonori
Proceeding of Annual Conference 2025 THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES
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常緑広葉樹二次林におけるリターフォールにつ いて ―16年間の調査結果―
高木正博
第79回九州森林学会 2023.10.20
Event date： 2023.10.20
Presentation type：Oral presentation (general)
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Plasticity in nitrogen use of <i>Cryptomeria japonica</i> cultivars in Kyushu and their radial growth response to disturbance
Enoki Tsutomu, Uchiyama Christmas, Takagi Masahiro, Ugawa Shin, Nabeshima Eri, Ishii Hiroaki
The Japanese Forest Society Congress 2023.5.30 The Japanese Forest Society
Event date： 2023.5.30
Language：English Presentation type：Oral presentation (general)
[in Japanese]
Awards 【 display / non-display 】
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九州森林学会論文賞
2017.10 九州森林学会
高木正博
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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根リターがもたらす炭素蓄積過程の環境応答モデルの構築
Grant number：24K03067 2024.04 - 2028.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究(B)
Authorship：Coinvestigator(s)
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菌類による枯死木分解が森林の更新と炭素貯留に与える影響は気候でどう変わるか
Grant number：24K01807 2024.04 - 2027.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究(B)
Authorship：Coinvestigator(s)
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森林から河川へ流出する炭素量は吸収量に対してどの程度の割合なのか？
Grant number：21H02238 2021.04 - 2024.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(B)
Authorship：Principal investigator
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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
Grant number：20H03031 2020.04 - 2024.03
独立行政法人日本学術振興会 科学研究費補助金 基盤研究(B)
Authorship：Coinvestigator(s)
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病害虫による大量枯死が森林生態系のCO2放出におよぼす影響の解明
Grant number：17H03823 2017.04 - 2022.03
科学研究費補助金 基盤研究(B)
Authorship：Coinvestigator(s)
Other research activities 【 display / non-display 】
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森林立地学会誌における「森林・林業実務必携」の書評
2021.10
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全国森林気象データベース
2003.04 - 2017.03
全国森林気象データベースの構築
