Denitrification in the valley soil of a forested catchment

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  • Konohira E.
    United Grad. Sch. of Agric. Sci., Tokyo Univ. of Agric. and Technol.
  • Yoh M.
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.
  • Toda T.
    Nat. Inst. of Agro-Environ. Sci.
  • Yagi K.
    Nat. Inst. of Agro-Environ. Sci.
  • Kubota J.
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.
  • Tsukamoto Y.
    Fac. of Agric., Tokyo Univ. of Agric. and Technol. Coll. of Bioresource Sci., Nihon Univ.

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Other Title
  • 森林流域谷底部土壌の脱窒作用
  • 森林流域谷底部土壌の脱窒作用--NO3-N窒素安定同位体比による解析
  • シンリン リュウイキタニ テイブ ドジョウ ノ ダッチツ サヨウ NO3- N
  • NO<SUB>3</SUB><SUP>-</SUP>-N窒素安定同位体比による解析
  • Analysis by the natural abundance of <SUP>15</SUP>N of nitrate

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Abstract

Denitrification processes in the soil of a forested catchment were studied using 15N/14N ratio of NO3--N and denitrification rates measured by anaerobic soil incubation in the presence of acetylene. The 15N/14N ratio of NO3--N (δ15N) in unsaturated soil solutions ranged from 3.6 to 0.9‰, and the differences between the valley floor and hillslope were insignificant. By contrast, the δ15N value of saturated soil solutions from the valley floor ranged from 1.2 to 4.7‰, and those from streamwater ranged from 0.9 to 5.0‰. The differences in δ15N between unsaturated and saturated soils suggested that denitrification occurred in saturated soil, causing large isotopic effects. Denitrification rates in saturated subsoils of the valley floor were larger than those in unsaturated surface soils, which agreed with the variation in δ15N. The positive correlation between δ15N in the saturated soil solutions and in the streamwater showed that denitrified water from saturated soil on the valley floor was discharged into the stream.

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