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The reason of the nutrient decrease of the Seto Inland Sea and its management

Research Project

Project/Area Number 23310007
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Environmental dynamic analysis
Research InstitutionKagawa University

Principal Investigator

TADA Kuninao  香川大学, 農学部, 教授 (80207042)

Co-Investigator(Kenkyū-buntansha) ICHIMI Kazuhiko  香川大学, 瀬戸内圏研究センター, 准教授 (70363182)
YAMAGUCHI Hitomi  香川大学, 農学部, 准教授 (50464368)
ISHIZUKA Masahide  香川大学, 工学部, 准教授 (50324992)
HONJO Tsuneo  香川大学, 瀬戸内圏研究センター, 特任教授 (80284553)
TARUTANI Kenji  独立行政法人水産総合研究センター, 西海区水産研究所, グループ長 (20371966)
Project Period (FY) 2011-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2013: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2011: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Keywords生物海洋学 / 生物海洋 / 栄養塩 / 栄養塩管理 / 表層堆積物 / 底質 / 栄養塩溶出速度
Research Abstract

The nutrient decrease in the Seto Inland Sea. During high economic growth since the 1960s, the Seto Inland Sea became heavily eutrophicated. However, the total nitrogen (TN) and phosphorous (TP) loads decreased from 1990s following the enactment of the Law for Conservation of Environment of Seto Inland Sea in 1973. Nutrient concentrations also gradually decreased. Recently, Nori culture has often heavily damaged due to the lack of nutrient. One explanation for the gradual decrease of DIN concentrations from 1970 to present is fundamentally due to the law enacted by the Environmental Agency. But the reason for the recent decrease of DIN concentrations is still unknown. It was thought that the decrease of the upward nutrient flux across the overlying water-sediment interface greatly affected the water column nutrient concentrations. From the relationship between nutrient and red tide occurrence, appropriate nutrient concentration was also discussed.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (33 results)

All 2014 2013 2012 Other

All Journal Article (15 results) (of which Peer Reviewed: 7 results) Presentation (18 results) (of which Invited: 1 results)

  • [Journal Article] Long-term (36-year) observations on the dynamics of the fish-killing raphidophyte Chattonella in Harima-Nada, eastern Seto Inland Sea, Japan2014

    • Author(s)
      Nishikawa, T., Hori, Y., Nagai, S., Miyahara, K., Nakamura, Y., Harada, K., Tada, K., Imai, I.
    • Journal Title

      Journal of Oceanography

      Volume: 70 Pages: 153-164

    • Related Report
      2013 Final Research Report
  • [Journal Article] 新川・春日川河口干潟(瀬戸内海備讃瀬戸)における懸濁粒子中のリンの挙動2014

    • Author(s)
      朝日俊雅・竹本沙紀・一見和彦・山口一岩・多田邦尚
    • Journal Title

      海の研究

      Volume: 23 Pages: 29-44

    • NAID

      110009816830

    • Related Report
      2013 Final Research Report
  • [Journal Article] PIP/PP ratio as an indicator of phytoplankton activities and origin of particulate matter in Harima-Nada, the Seto Inland Sea, Japan2014

    • Author(s)
      Asahi, T., Yamaguchi, H., Ichimi, K. and Tada, K.
    • Journal Title

      La mer

      Volume: 52 Pages: 1-11

    • NAID

      40020316985

    • Related Report
      2013 Final Research Report
  • [Journal Article] Horizontal distribution of particulate matter and its characterization using phosphorous as an indicator in surface coastal water, Harima-Nada, the Seto Inland Sea, Japan2014

    • Author(s)
      Asahi, T., Ichimi, K., Yamaguchi, H. and Tada, K.
    • Journal Title

      Journal of Oceanography

      Volume: 70 Pages: 277-287

    • Related Report
      2013 Final Research Report
  • [Journal Article] 瀬戸内海東部海域の栄養塩減少とその低次生産過程への影響2014

    • Author(s)
      多田邦尚・西川哲也・樽谷賢治・山本圭吾・一見和彦・山口一岩・本城凡夫
    • Journal Title

      沿岸海洋研究

      Volume: 52(印刷中)

    • Related Report
      2013 Final Research Report
  • [Journal Article] IP/PP ratio as an indicator of phytoplankton activities and origin of particulate matter in Harima-Nada, the Seto Inland Sea, Japan2014

    • Author(s)
      Asahi, T., Yamaguchi, H., Ichimi, K. and Tada, K.
    • Journal Title

      La mer

      Volume: 52 Pages: 1-11

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Horizontal distribution of particulate matter and its characterization using phosphorous as an indicator in surface coastal water, Harima-Nada, the Seto Inland Sea, Japan2014

    • Author(s)
      Asahi, T., Ichimi, K. , Yamaguchi, H. and Tada, K.
    • Journal Title

      Journal of Oceanography

      Volume: in press

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 新川・春日川河口干潟(瀬戸内海備讃瀬戸)における懸濁粒子中のリンの挙動2014

    • Author(s)
      朝日俊雅・竹本沙紀・一見和彦・山口一岩・多田邦尚
    • Journal Title

      海の研究

      Volume: 23

    • NAID

      110009816830

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Long-term (36-year) observations on the dynamics of the fish-killing raphidophyte Chattonella in Harima-Nada, eastern Seto Inland Sea, Japan2014

    • Author(s)
      Nishikawa, T., Hori, Y., Nagai, S., Miyahara, K., Nakamura, Y., Harada, K., Tada, K., Imai, I
    • Journal Title

      Journal of Oceanography

      Volume: 70

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 香川県における河川水の栄養塩形態と備讃瀬戸・播磨灘への影響2013

    • Author(s)
      石塚正秀・石川真菜・宮川昌志・赤井紀子・多田邦尚
    • Journal Title

      土木学会論文集(水工学)B1

      Volume: 69

    • NAID

      130004558176

    • Related Report
      2013 Final Research Report
  • [Journal Article] Optically active components and light attenuation in an offshore station of Harima Sound, eastern Seto Inland Sea, Japan2013

    • Author(s)
      Yamaguchi, H., Katahira, R., Ichimi, K. and Tada, K.
    • Journal Title

      Hydrobiologia

      Volume: 714 Pages: 49-59

    • Related Report
      2013 Annual Research Report 2013 Final Research Report
  • [Journal Article] Factor causing recent decrease of nutrients from rivers2013

    • Author(s)
      Ishizuka, M.
    • Journal Title

      Proceedings of EMECS 10 -MEDCOAST 2013 Joint Conference

      Volume: 2 Pages: 785-796

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 香川県における河川水の栄養塩形態と備讃瀬戸・播磨灘への影響2013

    • Author(s)
      石塚正秀
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: 68

    • NAID

      130004558176

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Optically active components and light attenuation in an offshore station of Harima Sound, eastern Seto Inland Sea, Japan2013

    • Author(s)
      Yamaguchi, Hitomi
    • Journal Title

      Hydrobiologia

      Volume: 未定 Issue: 1 Pages: 49-59

    • DOI

      10.1007/s10750-013-1520-y

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Total organic carbon and nitrogen contents in surface sediments of Harima Nada, eastern Seto Inland Sea, Japan : A comparison under two different trophic states

    • Author(s)
      Yamaguchi, H., Hirade, N.,Kayama, M., Ichimi, K. and Tada, K.
    • Journal Title

      Journal of Oceanography

      Volume: (in press)

    • NAID

      40020152905

    • Related Report
      2013 Final Research Report
  • [Presentation] PIP/TPP比を用いた沿岸域における表層懸濁粒子の分布と特性評価2014

    • Author(s)
      朝日俊雅, 山口一岩, 一見和彦, 多田邦尚
    • Organizer
      2014年度日本海洋学会春季大会
    • Place of Presentation
      東京海洋大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] この20年で播磨灘のクロロフィルaは変わったのか?2014

    • Author(s)
      山口一岩, 池本明耶香, 橘 睦朗, 一見和彦, 多田邦尚
    • Organizer
      2014年度日本海洋学会春季大会
    • Place of Presentation
      東京海洋大学
    • Related Report
      2013 Annual Research Report
  • [Presentation] 河口干潟域におけるリンを指標とした懸濁粒子の挙動2013

    • Author(s)
      朝日俊雅,山口一岩,一見和彦,多田邦尚
    • Organizer
      2013年度日本海洋学会秋季大会
    • Place of Presentation
      北海道大学学術交流会館
    • Related Report
      2013 Annual Research Report
  • [Presentation] 瀬戸内海海峡部(備讃瀬戸)における植物プランクトン生産の季節変動2013

    • Author(s)
      平出直人,東薗圭吾,一見和彦,多田邦尚,山口一岩
    • Organizer
      2013年度日本海洋学会秋季大会
    • Place of Presentation
      北海道大学学術交流会館
    • Related Report
      2013 Annual Research Report
  • [Presentation] 瀬戸内海播磨灘における夜光虫(Noctiluca sintillans)の冬季のブルームと植物プランクトン組成比への影響2013

    • Author(s)
      多田邦尚,池本明耶香,一見和彦,山口一岩
    • Organizer
      2013年度日本海洋学会秋季大会
    • Place of Presentation
      北海道大学学術交流会館
    • Related Report
      2013 Annual Research Report
  • [Presentation] 播磨灘における海底堆積物からの有機態・無機態窒素およびリン溶出2013

    • Author(s)
      多田邦尚,香山未歩,山口一岩,一見和彦
    • Organizer
      2013年度日本海洋学会秋季大会
    • Place of Presentation
      北海道大学学術交流会館
    • Related Report
      2013 Annual Research Report
  • [Presentation] Factors affecting temporal variation of light attenuation in a shallow embayment in the eastern Seto Inland Sea, Japan2013

    • Author(s)
      Yamaguchi, H., Tamura, T., Katahira, R., Ichimi, K., and Tada, K
    • Organizer
      AOGS 10th Annual Meeting
    • Place of Presentation
      Brisbane, Australia
    • Related Report
      2013 Annual Research Report
  • [Presentation] 瀬戸内海東部海域の栄養塩異変とその影響2013

    • Author(s)
      多田邦尚
    • Organizer
      2013年度日本海洋学会秋季大会
    • Place of Presentation
      北海道大学学術交流会館
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Factor causing recent decrease of nutrients from rivers2013

    • Author(s)
      Ishizuka, M
    • Organizer
      MECS 10 -MEDCOAST 2013 Joint Conference
    • Place of Presentation
      Marmaris, Turkey
    • Related Report
      2013 Annual Research Report
  • [Presentation] 播磨灘の底質環境と堆積物からの栄養塩flux2013

    • Author(s)
      多田邦尚
    • Organizer
      日本海洋学会
    • Place of Presentation
      東京海洋大学(東京)
    • Related Report
      2012 Annual Research Report
  • [Presentation] 播磨灘表層堆積物中のリン含有量の過去と現在の比較2012

    • Author(s)
      山口一岩
    • Organizer
      瀬戸内海研究研究会議
    • Place of Presentation
      岡山大学(岡山)
    • Related Report
      2012 Annual Research Report
  • [Presentation] 近年の瀬戸内海における底泥からの栄養塩fluxの研究2012

    • Author(s)
      多田邦尚
    • Organizer
      瀬戸内海研究研究会議
    • Place of Presentation
      岡山大学(岡山)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Influence of particulate materials on water clarity in Harima Nada, the eastern Seto Inland Sea, Japan2012

    • Author(s)
      Yamaguchi, Htomi
    • Organizer
      ASLO Aquatic Sciences Meeting, Shiga, Japan
    • Place of Presentation
      滋賀
    • Related Report
      2012 Annual Research Report
  • [Presentation] Degrease of nutrient flux from the sediment reduced the surface water nutrient concentration in the Seto Inland Sea2012

    • Author(s)
      Tada, Kuninao
    • Organizer
      ASLO Aquatic Sciences Meeting, Shiga, Japan
    • Place of Presentation
      滋賀
    • Related Report
      2012 Annual Research Report
  • [Presentation] 播磨灘表層堆積物中の炭素・窒素含有量の過去と現在2012

    • Author(s)
      山口一岩
    • Organizer
      日本海洋学会
    • Place of Presentation
      東海大学(静岡)
    • Related Report
      2012 Annual Research Report
  • [Presentation] 浅海域に設けた定点における海水の濁りと光透過性の経時的変化2012

    • Author(s)
      山口一岩
    • Organizer
      日本海洋学会
    • Place of Presentation
      東海大学(静岡)
    • Related Report
      2012 Annual Research Report
  • [Presentation] 近年の瀬戸内海における底泥からの栄養塩溶出の評価2012

    • Author(s)
      多田邦尚
    • Organizer
      日本海洋学会
    • Place of Presentation
      東海大学(静岡)
    • Related Report
      2012 Annual Research Report
  • [Presentation] Decrease of surface water nutrient concentration and nutrient flux from the sediment in Harima-Nada, Eastern Seto Inland Sea, Japan2012

    • Author(s)
      Tada, Kuninao
    • Organizer
      PICES(North Pacific Marine Science Organization)-2012
    • Place of Presentation
      広島
    • Related Report
      2012 Annual Research Report

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Published: 2011-04-06   Modified: 2019-07-29  

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