夏季の東京湾における懸濁態および堆積有機物の炭素安定同位体比  [in Japanese] Stable carbon isotope ratio of suspended particulate and sedimentary organic matter during the summer blooming in Tokyo Bay  [in Japanese]

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Author(s)

    • 小川 浩史 [他] OGAWA Hiroshi
    • 東京農工大学農学部資源・環境学科|(現)東京大学海洋研究所海洋生化学部門 Department of Environmental Science & Conservation, Faculty of Agriculture, Tokyo University of Agriculture & Technology|(Present address) Ocean Research Institute, University of Tokyo
    • 青木 延浩 AOKI Nobuhiro
    • (株)東京久栄技術センター:(現)(株)水土舎 Tokyo Kyuei Co., Ltd.: (Present address) Suidosha Co., Ltd.
    • 近 磯晴 KON Isoharu
    • (株)東京久栄技術センター:(現)(株)水土舎 Tokyo Kyuei Co., Ltd.: (Present address) Suidosha Co., Ltd.
    • 小倉 紀雄 OGURA Norio
    • 東京農工大学農学部資源・環境学科 Department of Environmental Science & Conservation, Faculty of Agriculture, Tokyo University of Agriculture & Technology

Abstract

The carbon isotopic characteristics (δ<sup>13</sup>C) of particulate organic matter during the summer blooming in Tokyo Bay have been investigated. The δ<sup>13</sup>C of suspended particulate organic matter (POM) in the surface seawater ranged from -15.4‰ to -4.5‰, which were considerably higher than the value generally known of planktonic organic matter (-20±1‰), suggesting that actively growing phytoplankton might be subjected to such a condition that the diffusion rate of CO<sub>2</sub> might strongly limit the production of organic carbon. However, the isotope ratios of surfacial sedimentary organic matter ranged from -20.4‰ to -18.1‰, which were lower than those of POM. The δ<sup>13</sup>C of sinking organic particles collected in sediment traps were similar to those of POM. Therefore, the <sup>13</sup>C-enriched isotope characteristics produced during summer phytoplankton blooming might be unlikely to be conserved in the sediments, possibly, by being mixed with terrestrial organic matter depleted in <sup>13</sup>C, and/or, being rapidly decomposed during their sedimentation process. In conclusion, it was strongly suggested that properly determining the marine-endmember of δ<sup>13</sup>C should be important if the δ<sup>13</sup>C would be principally used to estimate contributions of terrestrially and in situ produced organic matter in such an exceedingly eutrophic coastal area as Tokyo Bay.

Journal

  • Chikyukagaku

    Chikyukagaku 28(1), 21-36, 1994

    The Geochemical Society of Japan

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Codes

  • NII Article ID (NAID)
    110008679886
  • NII NACSIS-CAT ID (NCID)
    AN00141280
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0386-4073
  • NDL Article ID
    3875614
  • NDL Source Classification
    ZM41(科学技術--地球科学)
  • NDL Call No.
    Z15-645
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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