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Estimation of the impact of semi-labile dissolved organic nitrogen on the nutrient cycle in the coastal sea

Research Project

Project/Area Number 17K15302
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Aquatic bioproduction science
Research InstitutionKyoto University

Principal Investigator

Kobayashi Shiho  京都大学, フィールド科学教育研究センター, 助教 (60432340)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords溶存有機物 / 難分解性溶存有機物 / 準易分解性溶存有機物 / 栄養塩循環 / 沿岸海域 / 栄養塩管理手法 / 流動シミュレーション / 衛星情報 / 物理・生態系モデル / 海洋科学 / 環境分析 / 栄養塩管理
Outline of Final Research Achievements

The increase of refractory dissolved organic nitrogen (DON) in aquatic area, which is not decomposed after 100 days, has recently treated as a problem because it has put a load on water quality management but may not contribute as nutrient. Moreover, it is not clear the influences of the semi- labile DON, which is decomposed within 100 days but not decomposed after 20 days, on the nutrient cycle. It is important to investigate such DON because the water exchange rate of the upper layer of major bay with freshwater influences is within 20 days, then the DON may possibly flow out of the bay before it contributes as nutrient. In this study, we first measured the rate of semi- labile DON by the repeated field observations and decomposition experiments. We then estimated the outflow flux of semi- labile DON to out of the bay using numerical flow simulation and the inflow flux of nutrient from main river, and finally quantified the impact of semi- labile DON on nutrient cycle in the bay.

Academic Significance and Societal Importance of the Research Achievements

これまでに水域の生物生産環境への影響が注目されていた難分解性溶存有機窒素に加え,本研究では分解に要する期間が海水交換時間よりも長いために栄養塩に戻るより早く湾外に流出すると考えられる準易分解性溶存有機窒素のフラックスを算出し,それが陸域から流入した栄養塩の流入フラックスの何割にあたるかを示した.生物生産性を維持するための栄養塩濃度レベルの管理は沿岸海域で急務となっており,その成果は沿岸海域における持続的な生物生産と沿岸漁業の発展に,将来にわたって役立てることができる.また同時に,沿岸―陸棚海域においてCOD(化学的酸素要求量)などの水質指標の改善が進まない原因の解明にもつながると考えられる.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (28 results)

All 2020 2019 2018 2017

All Journal Article (16 results) (of which Peer Reviewed: 14 results,  Open Access: 3 results) Presentation (12 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] 淀川河口部汽水域における有機物の起源と分解特性2020

    • Author(s)
      渡部 夏帆,小林 志保,渕 真輝,浅岡 聡,林 美鶴
    • Journal Title

      水環境学会誌

      Volume: 43 (3)

    • NAID

      130007841068

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impact of nighttime hypoxia on ark shell Scapharca broughtonii mortality on a semi-enclosed embayment seabed2019

    • Author(s)
      Kei Senbokuya, Shiho Kobayashi, Noriyuki Ookei, Yoh Yamashita
    • Journal Title

      Fisheries Science

      Volume: 85(2) Pages: 369-377

    • NAID

      40021829619

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 山形県釜磯海岸における海底湧水の定量化と栄養塩環境への影響評価2019

    • Author(s)
      小林志保,生田健吾, 杉本 亮,本田尚美,山田 誠,富永 修,小路 淳,谷口真人
    • Journal Title

      日本水産学会誌

      Volume: 85(1) Pages: 30-39

    • NAID

      130007599915

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Observation and modeling of seawater exchange in a strait-basin system in the Seto Inland Sea, Japan2019

    • Author(s)
      小林 志保,中田 聡史,二村 彰,永本 和寿,藤原 建紀
    • Journal Title

      Journal of Water and Environment Technology

      Volume: 17(3) Pages: 141-152

    • NAID

      130007661869

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impact of nighttime hypoxia on ark shell Scapharca broughtonii mortality on a semi-enclosed2019

    • Author(s)
      Kei Senbokuya1・Shiho Kobayashi2・Noriyuki Ookei3・Yoh Yamashita
    • Journal Title

      Fisheries Science

      Volume: 85(2) Issue: 2 Pages: 369-377

    • DOI

      10.1007/s12562-018-01284-x

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Influences of Terrestrial Inputs of Organic Matter on Coastal Water and Bottom Sediments in the Seto Inland Sea, Japan2018

    • Author(s)
      Kobayashi,S. T.Fujiwara
    • Journal Title

      Journal of Water and Environment Technology

      Volume: 16(3) Pages: 138-148

    • NAID

      130007395706

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Submarine Groundwater Discharge and its Influence on Primary Production in Japanese Coasts: Case2018

    • Author(s)
      Honda, Hisami; Sugimoto, Ryo; Kobayashi, Shiho; Endo, Aiko; Oh, Tomohiro
    • Journal Title

      The Water-Energy-Food Nexus: Human-Environmental Security in the Asia-Pacific Ring of Fire

      Volume: - Pages: 101-115

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 高解像度人工衛星リモートセンシングによる大阪湾の赤潮動態解析2018

    • Author(s)
      小林 志保, 中田聡史
    • Journal Title

      環境技術

      Volume: 47(6) Pages: 302-306

    • Related Report
      2018 Research-status Report
  • [Journal Article] 衛星リモートセンシングを用いた大阪湾における赤潮動態解析2018

    • Author(s)
      小林 志保, 中田聡史,山本圭吾,秋山諭,渕真輝,林美鶴,石坂丞二
    • Journal Title

      瀬戸内海

      Volume: 76 Pages: 54-56

    • NAID

      40022490511

    • Related Report
      2018 Research-status Report
  • [Journal Article] High-resolution sea surface salinity maps in coastal seas based on geostationary ocean color images: quantitative analysis of river plume dynamics.2018

    • Author(s)
      S. Nakada, S. Kobayashi, M. Hayashi, J. Ishizaka, S. Akiyama, M. Fuchi, M. Nakajima
    • Journal Title

      Journal of Oceanography.

      Volume: 未定 Issue: 3 Pages: 1-18

    • DOI

      10.1007/s10872-017-0459-4

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 沿岸海域の貧酸素化を引き起こす有機物の起源推定:炭素安定同位体比を用いたアプローチ2018

    • Author(s)
      小林 志保, 藤原 建紀, 駒井 幸雄, 田中 周平, 鈴木 裕識
    • Journal Title

      水環境学会誌

      Volume: 40 Pages: 1-11

    • NAID

      130006307497

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 大阪湾における溶存有機物の起源推定および栄養塩の形態変化2017

    • Author(s)
      小林志保, 松村圭高, 河村耕史, 中嶋昌紀, 山本圭吾, 秋山諭, 上田幸男
    • Journal Title

      水環境学会誌

      Volume: 40 Pages: 97-105

    • NAID

      130005439533

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] High-resolution mapping and time-series measurements of 222Rn concentrations and biogeochemical properties related to submarine groundwater discharge along the coast of Obama Bay, a semi-enclosed sea in Japan2017

    • Author(s)
      Shiho Kobayashi, Ryo Sugimoto, Hisami Honda, Yoji Miyata, Daisuke Tahara, Osamu Tominaga, Jun Shoji, Makoto Yamada, Satoshi Nakada, Makoto Taniguchi
    • Journal Title

      Progress in Earth and Planetary Science

      Volume: 4 Issue: 1 Pages: 3-15

    • DOI

      10.1186/s40645-017-0124-y

    • NAID

      120006878520

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Phytoplankton primary productivity around submarine groundwater discharge in nearshore coasts2017

    • Author(s)
      Sugimoto Ryo, Kitagawa Katsuhiro, Nishi Saori, Honda Hisami, Yamada Makoto, Kobayashi Shiho, Shoji Jun, Ohsawa Shinji, Taniguchi Makoto, Tominaga Osamu
    • Journal Title

      Marine Ecology Progress Series

      Volume: 563 Pages: 25-33

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Visualization of the distribution of dissolved organic matter in Osaka Bay using a satellite ocean color sensor (COMS/GOCI)2017

    • Author(s)
      Kobayashi, Shiho; Nakada, Satoshi; Nakajima, Masaki; Yamamoto, Keigo; Akiyama, Satoshi; Fuchi, Masaki; Hayashi, Masataka; Ishizaka, Joji
    • Journal Title

      Journal of Water and Environment Technology

      Volume: 15 Pages: 55-64

    • NAID

      130005589262

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Parameter optimization of a 3D coastal model using Green's functions for modelling river plume2017

    • Author(s)
      Kobayashi, Shiho; Nakada, Satoshi; Takagi, Shuzo; Hirose, Naoki
    • Journal Title

      dynamicsJournal of Advanced Simulation in Science and Engineering

      Volume: 3 Pages: 153-164

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 環境DNAによる森里海連環の解明~河口域魚類群集に底層溶存酸素濃度が及ぼす影響~2020

    • Author(s)
      小林志保,久米学,Hyojin Ahn,邉見由美,Edouard Lavergne,寺島佑樹,Feng Ye,亀山哲,甲斐嘉晃,山下洋,笠井亮秀
    • Organizer
      令和元年度日本水産学会春季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 河口部汽水域における栄養塩濃度の変動要因解析2019

    • Author(s)
      小林 志保,渡部 夏帆,中田 聡史,渕 真輝,浅岡 聡,林 美鶴
    • Organizer
      平成30年度日本水産学会春季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 淀川河口域における有機物の起源と分解特性2019

    • Author(s)
      渡部夏帆,小林志保,中田聡史,渕真輝,浅岡聡,林美鶴
    • Organizer
      平成30年度日本水産学会春季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Seasonal and Spatial Variations of Dissolved Organic Carbon in Osaka Bay, Japan2019

    • Author(s)
      Kobayashi, K. Watanabe, K. Yamamoto, S. Akiyama, S. Tanaka, M.Ueda
    • Organizer
      WET2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 河口部汽水域における栄養塩濃度の変動要因解析2019

    • Author(s)
      小林 志保,渡部 夏帆,中田 聡史,渕 真輝,浅岡 聡,林 美鶴
    • Organizer
      日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 淀川河口域における有機物の起源と分解特性2019

    • Author(s)
      渡部夏帆・小林志保・中田聡史・渕真輝・浅岡聡・林美鶴
    • Organizer
      日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Estimation of origin of dissolved organic matter in Osaka Bay and the visualization of its outflow toward the outer Kii Channel2018

    • Author(s)
      小林志保*,中田聡史,山本圭吾,秋山諭,上田幸男,湯浅明彦,原田慈雄,御所豊穂,渕真輝,生田健吾,田中佑一,石坂丞二
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 淀川河口域における植物プランクトン由来有機物の生成と大阪湾奥の貧酸素化への影響2018

    • Author(s)
      渡部夏帆*,小林志保,中田聡史,渕真輝,浅岡聡,林美鶴
    • Organizer
      日本地球惑星科学連合2018年大会
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Observation and Modeling of Seawater Exchange in a Strait-Basin System in the Seto Inland Sea, Japan2018

    • Author(s)
      Shiho Kobayashi a, Satoshi Nakada b, Akira Futamura c, Kazuhisa Nagamoto d, Tateki Fujiwara
    • Organizer
      WET2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 淀川河口域における有機物の生成・分解と貧酸素化への影響2018

    • Author(s)
      渡部夏帆,渕真輝,中田聡史,林美鶴,小林志保
    • Organizer
      水産学会
    • Related Report
      2017 Research-status Report
  • [Presentation] The Spread of Terrestrial Organic Matter into a Coastal Sea during Flood Events and its Impact on the Sediments; a case study in the Seto Inland Sea, Japan2017

    • Author(s)
      Shiho Kobayashi, Tateki Fujiwara
    • Organizer
      WET2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] リモートセンシングを用いた大阪湾から紀伊水道への溶存有機物の流出経路の推定2017

    • Author(s)
      田中佑一, 生田健吾,山本圭吾, 秋山諭,原田慈雄, 御所豊穂,湯浅明彦,石坂丞二,中田聡史,小林志保
    • Organizer
      瀬戸内フォーラム
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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