Isotopic characterization of lake Kizaki and lake Suwa.

DOI Web Site 被引用文献6件 オープンアクセス
  • 吉岡 崇仁
    三菱化成生命科学研究所 生物地球化学・社会地球化学研究室 名古屋大学水圏科学研究所
  • 和田 英太郎
    三菱化成生命科学研究所 生物地球化学・社会地球化学研究室
  • 西條 八束
    名古屋大学水圏科学研究所

書誌事項

公開日
1988
DOI
  • 10.3739/rikusui.49.119
公開者
日本陸水学会

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説明

Carbon and nitrogen isotope ratios in sedimentary organics and δ15N of NO-3 and dissolved organic nitrogen are reported for two subalpine lakes in order to establish an isotopical and biogeochemical framework characterizing lake ecosystems. <BR>A two-source model is applicable to evaluate the contribution of land derived organics to the sedimentary organic matters of Lake Kizaki. A kind of chromatographic sedimentation of the land-derived particles with different specific gravity was suggested from the river mouth to the mid-lake. The size distributions of the isotope ratios support this inference. Denitrification and the associated oxidation reduction reaction seemed to enhance the 15N content of sedimentary organics during epidiagenesis of the sedimentary organic matters. The isotopic compositions of the sedimentary organics and the soluble nitrogenous compounds can be useful indicators to characterize a biogeochemical structure of a lake system. Significant increase in δ13C of sedimentary organics by 3% and in δ15N of NO-3 and DON by 2 to 7% were found under eutrophication caused by human impact, in the highly eutrophic lake, Lake Suwa. External loading of nutrient salts by human activities and its associated heavy water bloom of Microcystis are responsible for these phenomena.

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