Source and Decomposition of Organic Matter in the Estuary of Yodo River

• WATANABE Kaho

  Graduate School of Agriculture, Kyoto University

• KOBAYASHI Shiho

  Field Science Education and Research Center, Kyoto University

• FUCHI Masaki

  International Maritime Research Center, Kobe University

• ASAOKA Satoshi

  Research Center for Inland Seas, Kobe University

• HAYASHI Mitsuru

  Research Center for Inland Seas, Kobe University

Bibliographic Information

Other Title

• 淀川河口部汽水域における有機物の起源と分解特性
• ヨドガワ カコウブ キスイイキ ニ オケル ユウキブツ ノ キゲン ト ブンカイ トクセイ

Abstract

The inner part of Osaka Bay in Japan is affected by eutrophication, and the western part of the bay is affected by oligotrophic conditions. In this study, the distribution, sources, and decomposition rate of organic nitrogen (Org-N) in the estuarine region of Osaka Bay, defined as the region from the mouth of the Yodo River to the bay head, were studied to elucidate the cause of this uneven distribution of nutrients in the bay. Concentrations of Org-N are much higher in the estuary region than in freshwater areas or in the bay itself. Particulate organic nitrogen, which potentially sinks toward the bottom, accounted for 74 ± 11% of Org-N. The decomposition rate of dissolved organic nitrogen over 100 days, which is potentially supplied to the sea with low-salinity water, was 29 ± 4%. These results regarding the decomposition rate of organic matter in the estuarine region of Osaka Bay may improve the accuracy of models of the impact of land-sourced nutrient load on nutrient conditions in the bay.

Journal

• Journal of Japan Society on Water Environment

  Journal of Japan Society on Water Environment 43 (3), 87-96, 2020

  Japan Society on Water Environment

Keywords

• Yodo River
• Osaka Bay
• Brackish area
• Organic nitrogen
• Decomposition experiment of organic matter

Details

• CRID: 1390285300156564096
• NII Article ID: 130007841068
• NII Book ID: AN10372439
• DOI: 10.2965/jswe.43.87
• ISSN: 18813690
• ISSN: 09168958
• NDL BIB ID: 031197314
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031197314
• Web Site: https://www.jstage.jst.go.jp/article/jswe/43/3/43_87/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed