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Faculty of Agriculture Region of Forest Environment and Sustainability Sciences |
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Related SDGs |
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HIRATA Ryoko
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Papers 【 display / non-display 】
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Imaoka A., Hirata R., Ito S., Mitsuda Y., Takagi M.
Journal of Forest Research 31 ( 1 ) 1 - 6 2025.11
Authorship：Corresponding author Language：English 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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Journal of the Japanese Forest Society 107 ( 9 ) 208 - 213 2025.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Forest Society
This study aimed to quantify the influence of competition statuses with surrounding vegetation on crown suppression and stem growth reduction in planted trees. To this end, the four-level competition classification commonly used in previous studies (C1-C4) was converted into a numerical competition index (1-4). Based on this index, we estimated the crown suppression rate, expressed as the proportion of suppressed crown length and branch volume, and the associated reduction in stem growth. Two models were used for estimation: one model explained stem growth using exposed branch volume with the proportion of suppressed crown length as a parameter, while the other assessed the influence of the average competition index from four directions on stem growth. Using parameters from each model, we calculated the crown suppression rate and the stem growth reduction rate corresponding to each competition level. Note that C3 was excluded from analysis in this study due to the small sample size. The results showed that the crown suppression rates for C1, C2, and C4 were approximately 0％, 50％, and 80％, respectively. These values were lower than the visual criteria used to define these competitive statuses. In terms of stem growth, C2 and C4 were associated with 34％ and 86％ reductions, respectively, compared to C1, which experienced virtually no crown suppression. The discrepancy between the crown suppression rate and growth reduction rate in C2 suggests that the intensity of suppression by competitive vegetation is not uniform in the vertical direction, which likely affects the degree of growth reduction.
DOI： 10.4005/jjfs.107.208
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Journal of the Japanese Forest Society 107 ( 8 ) 179 - 185 2025.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Forest Society
We investigated the growth of sugi (<i>Cryptomeria japonica</i> D. Don) saplings during 6 years after planting and branch increments during the last two years under different competing vegetations (<i>Miscanthus sinensis</i>-dominated and deciduous tree-dominated) in order to clarify the effects of vegetation changes derived by continuing or omitting the weeding practices on the growth of planted sugi saplings. <i>Miscanthus</i> increased their dominance from the fourth year by continuing weeding, while the vegetation changed toward non-<i>Miscanthus</i>-dominated (deciduous tree-dominated) type one or two years after omitting weeding. The sugi planted in the initially deciduous tree-dominated site gained great advantages in vertical competition against the competing vegetation. Although sugi planted in the initially <i>Miscanthus</i>-dominated site gained advantages after continuing weeding for 3 to 4 years, their growth continued to be suppressed even after achieving the height advantages and/or after the vegetation change to non-<i>Miscanthus</i> type: the suppression was especially apparent in diameter growth. The branch increment of planted sugi during the same period was also less in the initially <i>Miscanthus</i>-dominated site compared to the initially deciduous tree-dominated site even at the parts higher than competing vegetation. We concluded that the suppressed crown development surrounded by thick <i>Miscanthus</i> cover at the early stage (ca. four years) resulted in the continuous restriction of further growth after changing the vegetation types and competition status, suggesting that weeding omission should be avoided in a <i>Miscanthus</i>-dominated vegetation.
DOI： 10.4005/jjfs.107.179
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Akaike Y., Ito S., Yamagawa H., Yamagishi K., Hirata R.
Landscape and Ecological Engineering 21 ( 4 ) 655 - 665 2025.6
Language：English Publishing type：Research paper (scientific journal) Publisher：Landscape and Ecological Engineering
We verified whether broadleaf tree populations in the understory of an uneven-aged conifer plantation followed Oliver’s model of natural forest recovery, and examined the contribution of forest edges between patches of different stand ages to mitigating the ‘stem exclusion’ process and encouraging ‘understory re-initiation’ process. We investigated an 82-year-old (as of 2005) sugi (Cryptomeria japonica) plantation with a total of six small patches of 4-, 21- and 40-year-old trees in north Kyushu, Japan. The 21-year-old patches showed the lowest species richness and individual density among the four patch/matrix ages. The 21-year-old patch adjacent to the 82-year-old matrix had more individuals and species than another 21-year-old patch. The 40-year-old patch surrounded by the 82-year matrix had a low abundance of small saplings (≥ 2 m height) of the natural forest species, which might have been recruited recently, as well as large saplings (≤ 2 m), compared with a 40-year-old patch adjacent to a 21-year-old patch and 82-year-old matrix. This result suggests that understory vegetation in the 21-year-old patches was at the stage of the ‘stem exclusion’ and in the 40-year-old patches was at the stage of the ‘understory re-initiation’ of Oliver’s model. Further, we concluded that light penetration from the 82-year-old matrix mitigated ‘stem exclusion’ of the 21-year-old patch, and that ‘understory re-initiation’ was promoted by the edge effects from the 82-year-old matrix, which might have provided a better light regime than the patch interior, resulting in recruitment of more seedlings around the edge.
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ヒノキ壮齢過密林分における間伐方法の違いが直径成長に与える影響 Reviewed
溝口拓朗, 伊藤 哲, 平田令子, 山岸 極, 光田 靖
森林立地 66 ( 1 ) 2024.5
Language：Japanese Publishing type：Research paper (scientific journal)
Books 【 display / non-display 】
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タネまく動物
小池伸介・北村俊平（ Role： Contributor）
文一総合出版 2024.9
Language：Japanese Book type：General book, introductory book for general audience
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景観生態学
日本景観生態学会 編（ Role： Contributor）
共立出版 2022.3
Language：Japanese Book type：Textbook, survey, introduction
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低コスト再造林への挑戦：一貫作業システム・コンテナ苗と下刈り省力化
中村松三, 伊藤 哲, 山川博美, 平田令子（ Role： Joint editor）
日本林業調査会 2019.6
Total pages：169 Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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ニホンノウサギの生態と排糞行動に関する調査 Invited Reviewed
中川恵翔，平田令子
森林技術 982 26 - 29 2024.2
Authorship：Corresponding author Language：Japanese Publishing type：Rapid communication, short report, research note, etc. (scientific journal)
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種子が鳥に運ばれる距離は長い？ Invited
平田令子,平尾多聞
照葉樹林だより 58 2 - 3 2021.3
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：一般社団法人てるはの森の会
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スギ低コスト再造林の先進地九州における下刈り省略研究の動向―第71回九州森林学会大会造林部門 下刈りセッションの記録―
山川博美，伊藤哲，平田令子
森林科学 ( 77 ) 47 - 49 2016.6
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other)
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ナラ枯れとカシノナガキクイムシについて
平田令子
照葉樹林だより 44 2 - 3 2015.12
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：てるはの森の会
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種子の散布距離は鳥の体の中で決まる？
平田令子
BIRDER 29 ( 12 ) 26 - 27 2015.12
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：文一総合出版
Presentations 【 display / non-display 】
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Conceptual patterns of movement by birds between habitat patches in forest landscape International conference
Ryoko Hirata, Satoshi Ito, Yasushi Mitsuda
The 10th IALE World Congress (IALE2019) (Milano, Italy) IALE
Event date： 2019.7.1 - 2019.7.5
Language：English Presentation type：Poster presentation
Venue：Milano, Italy
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Effective allocation design of riparian buffer strips in plantation forest landscapes for controlling sediment discharge from logged forests in southern Japan International conference
Ito Satoshi, Mizokuchi Takuro, Yamagishi Kiwamu, Mitsuda Yasushi, Hirata Ryoko
The 10th IALE World Congress (IALE2019) (Milano, Italy) IALE
Event date： 2019.7.1 - 2019.7.5
Language：English Presentation type：Oral presentation (general)
Venue：Milano, Italy
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Effects of soil moisture and light intensity on plant species diversity around forest edges in Indonesia
Yasa Palaguna Umar, Satoshi Ito, Yasushi Mitsuda, Ryoko Hirata, Tsuyoshi Kajisa
第130回日本森林学会大会 (新潟) 日本森林学会
Event date： 2019.3.22
Language：English Presentation type：Poster presentation
Venue：新潟
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宮崎県のシカ移入初期におけるスギ植栽苗への被害
平田令子, 佐藤真惟子, 伊藤 哲, 高木正博
第130回日本森林学会大会 (新潟) 日本森林学会
Event date： 2019.3.22
Language：Japanese Presentation type：Poster presentation
Venue：新潟
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無下刈り処理下におけるスギ挿し木コンテナ中苗の初期成長
小田 樹, 平田令子, 伊藤 哲, 山川博美, 山下義治, 古川浩児
第130回日本森林学会大会 (新潟) 日本森林学会
Event date： 2019.3.22
Language：Japanese Presentation type：Poster presentation
Venue：新潟
Awards 【 display / non-display 】
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令和8年度 日本森林学会学生奨励賞
2026.3 日本森林学会
Yuki Akaike, Satoshi Ito, Hiromi Yamagawa, Kiwamu Yamagishi, Ryoko Hirata
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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第136回日本森林学会大会学生ポスター賞
2024.3 日本森林学会
稲葉光飛,伊藤哲,山川博美,山岸極,祁答院宥樹,平田令子
Award type：Award from Japanese society, conference, symposium, etc. Country：Japan
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The 10th East Asian Federation of Ecological Societies (EAFES) Poster Award
2023.7 東アジア生態学連合
Nishi Suzunei, Hirata Ryoko, Ito Satoshi
Award type：Award from international society, conference, symposium, etc. Country：Korea, Republic of
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The 10th East Asian Federation of Ecological Societies (EAFES) Poster Award
2023.7 東アジア生態学連合
Hata Jusi, Ito Satoshi, Hirata Ryoko, Oyama Hiroyuki, Takagi Chihiro
Award type：Award from international society, conference, symposium, etc. Country：Korea, Republic of
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令和二年度宮崎大学女性研究者奨励賞
2021.3 宮崎大学
平田令子
Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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「やってはいけない森林施業」を明らかにするアセスメント
Grant number：26660128 2014.04 - 2016.03
科学研究費補助金 挑戦的萌芽研究
Authorship：Coinvestigator(s)
これまでの森林施業研究の失敗例のレビューに基づき、既往研究の成果を実際の森林管理に活かすための「選択許容範囲」を提示することを目的とする。
Available Technology 【 display / non-display 】
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森林樹木の獣害・病害虫防除に関する研究
針葉樹人工林の広葉樹林化に関する研究
スギ・ヒノキの低コスト再造林に関する研究Home Page： 森林緑地環境科学科
Related fields where technical consultation is available：・野生動物や昆虫による森林被害の防除
・低コスト再造林