多摩川永田地区河川敷地下水における無機態窒素の動態 Dynamics of inorganic nitrogen compounds for floodplain groundwater in the Nagata district of the Tama River

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著者

    • 対馬 孝治 TSUSHIMA Kouji
    • 東京農工大学大学院連合農学研究科 United Graduate School of Agriculture, Tokyo University of Agriculture and Technology
    • 小倉 紀雄 OGURA Norio
    • 東京農工大学大学院連合農学研究科 United Graduate School of Agriculture, Tokyo University of Agriculture and Technology

抄録

This study aimed to clarify the possible role of floodplains in biogeochemical nitrogen cycles based on dynamics of inorganic nitrogen species in groundwater. Samples collected from groundwater of the floodplain in the middle reach of the Tama River, Nagata district, were analyzed for dissolved oxygen, dissolved organic carbon, major ions, nitrous oxide and nitrogen stable isotope ratio of nitrate. There were some observed wells where the dissolved oxygen concentration in groundwater was kept low through the observation period. In groundwater with lower dissolved oxygen concentration, nitrate decreased to the detection limit mainly in the summer season. Furthermore, nitrous oxide decreased to below the atmospheric equilibrium concentration (〜10nM) in the season of nitrate decline. In aerobic groundwater, nitrate is the predominant inorganic nitrogen species and concentration of nitrous oxide is known to be higher than the atmospheric equilibrium. However, floodplain groundwater was sink for both nitrate and nitrous oxide. Thus this study proves that unconfined groundwater in floodplain can perform an important role as nitrogen sinks for material cycles in river catchments.

収録刊行物

  • 地球化学

    地球化学 36(1), 15-22, 2002

    一般社団法人日本地球化学会

参考文献:  19件中 1-19件 を表示

被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    110008680030
  • NII書誌ID(NCID)
    AN00141280
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0386-4073
  • NDL 記事登録ID
    6097331
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-645
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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