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Considering Acacia plantation from marine fishery and nutirent flow -A case study in central Vietnam-

Research Project

Project/Area Number 18K18250
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 80010:Area studies-related
Research InstitutionKyoto University

Principal Investigator

Okamoto Yuki  京都大学, 地球環境学堂, 研究員 (00635500)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsベトナム / カキ / アカシア / 栄養塩類 / 湾 / プランテーション / 栄養塩 / 基礎生産 / マイクロプラスチック / アカシアプランテーション / 牡蠣養殖 / 土地利用 / 集水域 / 海域漁業 / 栄養塩類フロー
Outline of Final Research Achievements

Effect and nutrients input/loads from Natural Forest and Acacia Planation into the oyster aquaculture fishery and coastal environment was examined in central Vietnam.
As a result, 1) differences in land forest types did not show any differences in nutrient loads (low impact), 2) oysters were cultured, inhabited in his bay and estimated production was around 4000 tons/bay, 3) PO4 in bottom water was suggested as a characterized nutrient source in this bay, and 4) fertilization in Acacia plantation was limited in amount and period with specific contract based management with ownership which support local residents to implement to Acacia plantation as one of their livelihood activities in study area.
Therefore, in terms of negative impacts in nutrients loads in the coastal water and oyster production, there were not observed in this study site.

Academic Significance and Societal Importance of the Research Achievements

ベトナム中部沿岸域にけるアカシアプランテーションが沿岸漁業環境に与える影響についえ具体的に調べた研究はこれまでになく、従来の考えでは、プランテーション農業は、モノカルチャーであること、多量の施肥など、ネガティブな側面が取り上げられてきた。
本例で取り上げたベトナム中部の事例では、沿岸域で養殖されるカキ、プランクトン、そしてその栄養である栄養塩類にフォーカスして分析した結果、自然林、アカシア林ともに沿岸域への栄養塩類の負荷は小さいものであることが明らかになり、主な栄養塩の起源は底質であることが示唆された。地域性が反映された結果でもあるが、思い込み・想定を覆す重要な事例を掲示出来た意義は大きい。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (1 results) Remarks (1 results)

  • [Int'l Joint Research] フエ科学大学/フエ農林大学(ベトナム)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] フィリピン大学ビサヤ校(フィリピン)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Sediment organic matter source estimation and ecological classification in the semi-enclosed Batan Bay Estuary, Philippines2021

    • Author(s)
      Yuya Ogawa, Yuki Okamoto, Resurreccion Bitoon Sadaba, Mamoru Kanzaki
    • Journal Title

      International Journal of Sediment Research

      Volume: 36 Issue: 1 Pages: 110-119

    • DOI

      10.1016/j.ijsrc.2020.05.007

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Geochemical speciation of metals (Cu, Pb, Cd) in fishpond sediments in Batan Bay, Aklan, Philippines2020

    • Author(s)
      Mae Grace Nillos, Hilario Taberna Jr, Roxzien Shaye Sesbreno, Ida Pahila, Yuki Okamoto, Nathaniel Anasco
    • Journal Title

      Environmental Monitoring and Assessment

      Volume: 192 Issue: 10 Pages: 658-658

    • DOI

      10.1007/s10661-020-08613-7

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ベトナム中部における集水域から沿岸域への栄養塩フローの解析2019

    • Author(s)
      武田華生、岡本侑樹、Ho Tan Duc、Le Thai Hung
    • Organizer
      平成31年度 日本水産学会春季大会
    • Related Report
      2018 Research-status Report
  • [Remarks] 思いやりのあるお節介ベトナムのメンタリティーp.50-58 編)田中 フィールドで出会う風と人と土4

    • URL

      http://www.chikyu.ac.jp/publicity/publications/others/img/kazehitotsuchi_essay4_2.pdf

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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