Shimpei OIKAWAAssociate Professor
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Paper
- Changes in leaf lifespan, nitrogen resorption, and mean residence time of leaf nitrogen along a soil fertility gradient in an evergreen oak tree
Shimpei Oikawa, Lead, Abstract
The ability of plants to retain nitrogen (N) for a long period of time is critical to their N use efficiency, growth, and fitness, particularly in infertile environments. The mean residence time of leaf N (MRTL) and its two determinants, leaf lifespan and N resorption efficiency (rN, the fraction of the total leaf N pool that is resorbed during leaf senescence), have been hypothesized to increase plastically with decreasing soil N fertility but this remains to be fully tested. To avoid confusion by random changes in these characteristics in a relatively narrow N fertility range, MRTL, leaf lifespan, and N resorption efficiency were measured in Quercus glauca over a broad N fertility range. In the high to moderate N fertility range, leaf lifespan and rN increased with decreasing N addition rate, and thus the MRTL increased. However, in the moderate to low N fertility range, leaf lifespan increased but rN decreased significantly, so MRTL decreased. The decrease in rN occurred because the senesced leaf N concentration was almost constant at the lower limit while the green leaf N concentration decreased in this range. The hump‐shaped quadratic responses of MRTL and rN along the N fertility gradient suggest that incorrect conclusions about the response of these traits to N fertility variation may be drawn from experiments that include only a few fertility levels, and N recycling within leaf canopy alone cannot achieve efficient N use in infertile environments., Wiley
Physiologia Plantarum, 12 Sep. 2024, [Reviewed] - Herbicide management of roadside kudzu (Pueraria lobata) vegetation doubles soil nitrification and nitrate leaching rates
Miki U. Ueda; Nobuo Sakagami; Tadao Enomoto; Genki Katata; Yugo Suzuki; Yui Takase; Shimpei Oikawa, Last
Landscape and Ecological Engineering, Jul. 2024, [Reviewed] - Competition between the invasive alien species Solidago altissima and the native Pueraria lobata in Japan
Naoki Masada; Tadao Enomoto; Genki Katata; Nobuo Sakagami; Yugo Suzuki; Shimpei Oikawa, Last, Taylor & Francis
Botany Letters, Jun. 2023, [Reviewed] - Evidence of NOx and O3 concentration reduction by kudzu Pueraria lobata invasion at a Japanese highway
Genki Katata; Mirai Watanabe; Shimpei Oikawa; Akiko Takahashi; Tomohiro Kubota; Yui Takase; Tadao Enomoto; Keitaro Fukushima; Nobuo Sakagami; Miki U. Ueda; Yugo Suzuki, Elsevier
Atmospheric Pollution Research, Jan. 2023, [Reviewed] - 〔Major achievements〕Effect of symbiotic N2-fixation on leaf protein contents, protein degradation and nitrogen resorption during leaf senescence in temperate deciduous woody species
Ryo Tanabe; Shin-Ichi Miyazawa; Osamu Kitade; Shimpei Oikawa, Last, Springer
Oecologia, 17 Sep. 2022, [Reviewed] - 〔Major achievements〕Supra-optimal leaf area index of a temperate liana Pueraria lobata for competition with Solidago altissima at the expense of canopy photosynthesis.
Shimpei Oikawa, Lead, Oxford
Tree Physiology, Jul. 2022, [Reviewed] - Leaf productivity and persistence have been improved during soybean (Glycine max) domestication and evolution
Ayaka Togashi; Shimpei Oikawa, Last, Springer
Journal of Plant Research, Jan. 2021, [Reviewed] - People's attitude towards strategies to control kudzu (Pueraria lobar (Wield.) Ohwi) during road slope revegetation
高瀬唯; 及川真平; 榎本忠夫; 堅田元喜; 坂上伸生, 一般社団法人 環境情報科学センター
環境情報科学研究論文集, Dec. 2020, [Reviewed] - Species-specific nitrogen resorption proficiency in legumes and nonlegumes
Shimpei Oikawa · Yusuke Matsui · Michio Oguro · Masanori Okanishi · Ryo Tanabe · Tomoki Tanaka · Ayaka Togashi · Tomoyuki Itagaki, Lead
Journal of Plant Research, Aug. 2020, [Reviewed] - Leaf shedding increases the photosynthetic rate of the canopy in N2-fixing and non-N2-fixing woody species.
Tomoki Tanaka; Chiharu Kurokawa; Shimpei Oikawa, Last, Oxford University Press
Tree Physiology, Sep. 2018, [Reviewed] - Nitrogen resorption in senescing leaf blades of rice exposed to Free-Air CO2 Enrichment (FACE) under different N fertilization levels
Shimpei Oikawa; Hitomi Ehara; Mika Koyama; Tadaki Hirose; Kouki Hikosaka; Charles P. Chen; Hirofumi Nakamura; Hidemitsu Sakai; Takeshi Tokida; Yasuhiro Usui; Toshihiro Hasegawa, Lead, Springer
Plant and Soil, Sep. 2017, [Reviewed] - Inconsistent intraspecific pattern in leaf life span along nitrogen-supply gradient
Shimpei Oikawa; Koya Suno; Noriyuki Osada, Lead
AMERICAN JOURNAL OF BOTANY, Feb. 2017, [Reviewed] - Changes in leaf area, nitrogen content and canopy photosynthesis in soybean exposed to an ozone concentration gradient
Shimpei Oikawa; Elizabeth A. Ainsworth, Lead
ENVIRONMENTAL POLLUTION, Aug. 2016, [Reviewed] - A meta-analysis of leaf nitrogen distribution within plant canopies
Kouki Hikosaka; Niels P. R. Anten; Almaz Borjigidai; Chiho Kamiyama; Hidemitsu Sakai; Toshihiro Hasegawa; Shimpei Oikawa; Atsuhiro Iio; Makoto Watanabe; Takayoshi Koike; Kazuya Nishina; Akihiko Ito
ANNALS OF BOTANY, Aug. 2016, [Reviewed] - Trait-Based Approaches for Understanding Species Niche, Coexistence, and Functional Diversity in Subalpine Moorlands
Kouki Hikosaka; Takehiro Sasaki; Chiho Kamiyama; Masatoshi Katabuchi; Shimpei Oikawa; Masaya Shimazaki; Hiroshi Kimura; Tohru Nakashizuka
Structure and Function of Mountain Ecosystems in Japan, 05 Apr. 2016, [Reviewed] - Nitrogen-utilization efficiency in rice: an analysis at leaf, shoot, and whole-plant level
Takahiro Ogawa; Shimpei Oikawa & Tadaki Hirose
Plant and Soil, Mar. 2016, [Reviewed] - Leaf dynamics in growth and reproduction of Xanthium canadense as influenced by stand density
Takahiro Ogawa; Shimpei Oikawa; Tadaki Hirose
ANNALS OF BOTANY, Oct. 2015, [Reviewed] - Implications of lifespan variation within a leaf cohort for evaluation of the optimal timing of leaf shedding
Noriyuki Osada; Shimpei Oikawa; Kaoru Kitajima, Wiley
Functional Ecology, Sep. 2014, [Reviewed] - Seasonal change in light partitioning among coexisting species of different functional groups along elevation gradient in subalpine moorlands
Chiho Kamiyama; Shimpei Oikawa; Kouki Hikosaka
New Phytologist, Aug. 2014, [Reviewed] - 機能形質から種のニッチ，共存，そして消失を理解する：亜高山帯湿原群集を対象とした群集生態学と生理生態学からのアプローチ
彦坂 幸毅; 佐々木 雄大; 神山 千穂; 片渕 正紀; 及川 真平; 嶋崎 仁哉; 木村 啓; 中静 透, 国際環境研究協会
地球環境, 2014, [Reviewed] - Effects of elevated CO2 on leaf area dynamics in nodulating and non-nodulating soybean stands
Shimpei Oikawa; Masumi Okada; Kouki Hikosaka, Lead
Plant and Soil, Jul. 2013, [Reviewed] - Mean residence time: leaf number, area, dry mass, and nitrogen in canopy photosynthesis
Tadaki Hirose; Shimpei Oikawa, Last, Springer
Oecologia, Feb. 2013, [Reviewed] - Effects of elevated [CO2] on stem and root lodging among rice cultivars
Zhu Chunwu; Weigo Chen; Hidemitsu Sakai; Shimpei Oikawa; Rebecca C Laza; Yasuhiro Usui; Toshihiro Hasegawa
Chinese Science Bulletin, Jan. 2013, [Reviewed] - Demand and supply of N in seed production of soybean (Glycine max) at different N fertilization levels after flowering
Toshihiko Kinugasa; Takashi Sato; Shimpei Oikawa; Tadaki Hirose, Springer
Journal of Plant Research, Jun. 2011, [Reviewed] - Effects of elevated CO2 concentration on seed production in C-3 annual plants
Kouki Hikosaka; Toshihiko Kinugasa; Shimpei Oikawa; Yusuke Onoda; Tadaki Hirose
JOURNAL OF EXPERIMENTAL BOTANY, Feb. 2011, [Reviewed] - Light interception in species with different functional groups coexisting in moorland plant communities
Chiho Kamiyama; Shimpei Oikawa; Takuya Kubo; Kouki Hikosaka
Oecologia, Jun. 2010, [Reviewed] - Interactions between elevated CO2 and N2-fixation determine soybean yield—a test using a non-nodulated mutant
Shimpei Oikawa; Kay-May Miyagi; Kouki Hikosaka; Masumi Okada; Toshinori Matsunami; Makie Kokubun; Toshihiko Kinugasa & Tadaki Hirose, Lead
Plant and Soil, Oct. 2009, [Reviewed] - Reproductive yield of individuals competing for light in a dense stand of an annual, Xanthium canadense
Yosuke Matsumoto; Shimpei Oikawa; Yuko Yasumura; Tadaki Hirose; Kouki Hikosaka
OECOLOGIA, Aug. 2008, [Reviewed] - Does leaf shedding increase the whole-plant carbon gain despite some nitrogen being lost with shedding?
Shimpei Oikawa; Kouki Hikosaka; Tadaki Hirose, Lead
New Phytologist, May 2008, [Reviewed] - Leaf lifespan and lifetime carbon gain of individual leaves in a stand of an annual herb, Xanthium canadense
Shimpei Oikawa; Kouki Hikosaka; Tadaki Hirose, Lead, Wiley
New Phytologist, Jul. 2006, [Reviewed] - Leaf lifespan and lifetime carbon balance of individual leaves in a stand of an annual herb, Xanthium canadense
Oikawa, Shimpei; Hikosaka, Kouki; Hirose, Tadaki
New Phytologist, 2006, [Reviewed] - Dynamics of leaf area and nitrogen in a canopy of an annual herb, Xanthium canadense
Shimpei Oikawa; Kouki Hikosaka; Tadaki Hirose, Lead
Oecologia, May 2005, [Reviewed] - Cost-benefit relationships in fronds emerging at different times in a deciduous fern, Pteridium aquilinum
Shimpei Oikawa; Kouki Hikosaka; Tadaki Hirose; Masae Shiyomi; Shigeo Takahashi; Yoshimichi Hori, Lead
Canadian Journal of Botany, Apr. 2004, [Reviewed]
MISC
- グリーンムーブメント "確かに「望ましくない」のだけれど"
及川真平
高速道路と自動車, 01 Jun. 2023, [Invited] - グリーンムーブメント "国内外で雑草扱いされるクズ（葛）"
及川真平
高速道路と自動車, 01 May 2023, [Invited] - グリーンムーブメント "雑草とは何か"
及川真平
高速道路と自動車, 01 Apr. 2023, [Invited] - 葉寿命研究のこれから
長田典之; 及川真平; Onno Muller; 宮田理恵
日本生態学会誌, 2013, [Reviewed] - Lifetime carbon gain of individual leaves in a stand of an annual herb, Xanthium canadense
Oikawa Shimpei; Hikosaka Kouki; Hirose Tadaki
Abstracts of the Annual Meeting of the Ecological Society of Japan, 2005
Books and other publications
- Plants and microclimate (3rd edition)
Hamlin G. Jones, Joint translation
森北出版, 2017 - 植物学の百科事典
Joint work
丸善出版, 2016 - Structure and Function of Mountain Ecosystems in Japan
Kouki Hikosaka; Takehiro Sasaki; Chiho Kamiyama; Masatoshi Katabuchi; Shimpei Oikawa; Masaya Shimazaki; Hiroshi Kimura and Tohru Nakashizuka
Springer, 2015 - Structure of herbaceous plant stands and canopy photosynthesis models
Single work
2008
Lectures, oral presentations, etc.
- 〔Major achievements〕Does plant strategy on resource investment in seeds and appendages vary depending on the cost of seed production and the function of the appendages?
衣笠利彦; 永松大; 板垣智之; 向井駿広; 及川真平
第７２回 日本生態学会大会, 17 Mar. 2025
20250315, 20250318 - 〔Major achievements〕土壌肥沃度勾配に沿った葉の寿命, 窒素吸収, 葉窒素の平均滞留時間の変化
及川真平
第７２回 日本生態学会大会, 17 Mar. 2025
20250315, 20250318 - 富士スバルラインの路傍植生における種構成の標高に伴う変化
紺野由佳; 及川真平; 塩見正衛; 中野隆志; 安田泰輔; 山村靖夫
2024年度 システム農学会, 01 Nov. 2024
20241101, 20241102 - 高速道路盛土法面におけるクズ群落のオゾン・窒素酸化物の低減効果は樹林に匹敵するか？
堅田元喜; 和田龍一; 及川真平; 榎本忠夫; 坂上伸生; 高瀬唯; 鈴木雄吾
第65回大気環境学会年会, Sep. 2024
20240911, 20240913 - 道路緑地における植生管理が法面土壌の化学性および物理性に及ぼす影響ついて
宮﨑永遠・バティン一希・鈴木雄吾・西澤智康・堅田元喜・榎本忠夫・高瀬 唯・及川真平・坂上伸生
日本土壌肥料学会 関東支部大会, 20 Nov. 2022, 日本土壌肥料学会
20221120, 20221120 - 〔Major achievements〕群落光合成を最大化しない葉面積指数の適応的意義: クズ群落のケース
及川真平
The 69 th Annual Meeting of the Ecological Society of Japan, Mar. 2022, Ecological Society of Japan
20220314, 20220319 - 〔Major achievements〕ダイズの栽培化に伴う葉の生産性と被食防御の変化
戸田風香・及川真平
第69回 日本生態学会大会, Mar. 2022, 日本生態学会
20220314, 20220319 - 〔Major achievements〕強害雑草クズの繁茂がソバの送粉と結実に与える影響
斎藤歩乃花・板垣智之・及川真平
第69回 日本生態学会大会, Mar. 2022, 日本生態学会
20220314, 20220319 - 高速道路法面における除草剤の散布が土壌の化学性および土壌微生物群集に与える影響
坂上伸生; 迫田翠; 竹内琴音; 西澤智康; 堅田元喜; 福島慶太郎; 榎本忠夫; 高瀬唯; 及川真平
日本土壌肥料学会 2020年度 岡山大会, Sep. 2020
202009 - 高速道路法面における除草剤の散布が土壌微生物群集に与える影響
迫田翠; 坂上伸生; 郭永; 西澤智康; 堅田元喜; 榎本忠夫; 高瀬唯; 及川真平
日本土壌微生物学会 2020年度大会, Jun. 2020
202006 - クズの繁茂した高速道路法面における除草剤散布が窒素流出に及ぼす影響
福島慶太郎; 吉村佳一郎; 堅田元喜; 坂上伸生; 榎本忠夫; 高瀬 唯; 及川真平
日本生態学会 第67回大会, Mar. 2020
202003 - 側道から見た高速道路の盛土法面に繁茂するクズに対する市民の景観評価
高瀬唯; 及川真平; 榎本忠夫; 堅田元喜; 坂上伸生
日本造園学会関東支部大会, 23 Nov. 2019, 日本造園学会
20191123 - 高速道路盛土法面の植生が及ぼす大気質への局地的影響の予備的観測
堅田元喜; 渡邉未来; 高橋晃子; 福島慶太郎; 久保田智大; 及川真平; 高瀬唯; 榎本忠夫; 坂上伸生
第60回 大気環境学会年会, 18 Sep. 2019, 大気環境学会
201909 - 〔Major achievements〕Leaf shedding optimizes the photosynthetic rate of the canopy in deciduous woody species
Tomoki Tanaka; Chiharu Kurokawa; *Shimpei OIKAWA
The 66th Annual Meeting of the Ecological Society of Japan, 18 Mar. 2019, Ecological Society of Japan - 〔Major achievements〕Comparison of leaf traits between wild progenitor of soybean and soybean cultivars
Ayaka TOGASHI; Shimpei Oikawa
The 66th Annual Meeting of the Ecological Society of Japan, 17 Mar. 2019, Ecological Society of Japan - 〔Major achievements〕Is leaf protein composition determinant of nitrogen resorption?
Ryo Tanabe; Shinpei Oikawa
The 66th Annual Meeting of the Ecological Society of Japan, 17 Mar. 2019, Ecological Society of Japan - 〔Major achievements〕植物の落葉タイミングは最適か: 野外での検証
日本生態学会第63回全国大会, 24 Mar. 2016 - 〔Major achievements〕ダイズの栽培化に伴う形質の変化：何を得て何を失ったのか？
日本生態学会第63回全国大会, 22 Mar. 2016 - A meta-analysis of leaf nitrogen distribution within plant canopies
第63回日本生態学会仙台大会, Mar. 2016 - 植物葉群内における葉間窒素分配のメタ解析
東北植物学会第5回大会, 19 Dec. 2015 - 窒素固定植物の老化葉からの窒素回収
日本生態学会第62回全国大会, Mar. 2015
Research Themes
- 〔Major achievements〕栽培化によって損なわれた植物機能の解明：増大する環境ストレスへの応答（研究代表者）
基盤研究 (B)
Apr. 2023 - Mar. 2027 - 高速道路緑地における新たな管理手法の開発・管理
Apr. 2019 - Mar. 2024 - マメ科植物は窒素を贅沢に使っているのか：老化する葉からの窒素回収とその要因（研究代表者）
基盤研究（C）
Apr. 2017 - Mar. 2021 - マメ科植物は窒素を贅沢に使っているのか：老化する葉からの窒素回収とその要因（研究代表者）
2017 - 2020 - 寄生性植物ネナシカズラの嗜好性：ジェネラリストか, スペシャリストか?（研究代表者）
Apr. 2018 - Mar. 2019 - 安全で快適な高速走行環境の構築に向けた新たな緑地管理手法の開発ー大学・企業・住民で考える未来志向型の高速道路緑地管理手法（研究代表者）
Apr. 2018 - Mar. 2019 - 茨城大学イノベーション研究推進プログラム
Apr. 2015 - Mar. 2016 - マメ科植物の窒素再利用とリターフォールを介した土壌への影響に関する研究（研究代表者）
Apr. 2014 - Mar. 2015 - 育種過程で植物が獲得・喪失した形質の探索（研究代表者）
2014 - 2015 - 植物の栄養・繁殖成長が個葉の枯死に及ぼす影響（研究代表者）
若手研究
Apr. 2011 - Mar. 2014 - 植物の栄養・繁殖成長が個葉の枯死に及ぼす影響（研究代表者）
若手B
2011 - 2013
Social Contribution Activities
- 生物季節モニタリング調査
investigator
Aug. 2021 - Present - 環境省 重要生態系監視地域モニタリング推進事業（モニタリングサイト1000）里地里山調査（第5期: 2023年度~2027年度）
informant
環境省、日本自然保護協会, Apr. 2023 - Mar. 2028 - 気候変動対策と生物多様性の保全〜持続可能な地球環境のために〜
lecturer
茨城県水戸生涯学習センター「三の丸カレッジ」, 19 Oct. 2024 - 環境省 重要生態系監視地域モニタリング推進事業（モニタリングサイト1000）里地里山調査（第４期: 2018年度~2022年度）
informant
環境省、日本自然保護協会, Apr. 2018 - Mar. 2022 - 茨城県建設コンサルタンツ協会 技術力向上セミナー
appearance
一般社団法人 茨城県建設コンサルタンツ協会, 06 Oct. 2021 - 06 Oct. 2021 - 茨城県技術懇談会
lecturer
Nov. 2020
Academic Contribution Activities
- Ecological Research, Associate Editor in Chief
Supervision
Jan. 2022 - Present - 生物季節モニタリング（生物季節観測）
Academic research planning
Apr. 2021 - Present - Journal of Plant Research, Editorial board member
Review
Dec. 2016 - Present - 環境省 重要生態系監視地域モニタリング推進事業（モニタリングサイト1000）里地里山調査（第5期: 2023年度~2027年度）
Academic research planning
Apr. 2023 - 31 Mar. 2028 - 環境省 重要生態系監視地域モニタリング推進事業（モニタリングサイト1000）里地里山調査（第４期: 2018年度~2022年度）
Academic research planning
01 Apr. 2018 - 31 Mar. 2023
