Storm Solute Behavior of a Small Forested Catchment in Southern Kyushu.

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  • Takagi M.
    Faculty of Agriculture, Miyazaki University
  • Nogami K.
    Faculty of Agriculture, Miyazaki University
  • Nakagawa Y.
    Field Science Center for Northern Biosphere, Hokkaido University

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  • 南日本太平洋側の山地小流域における降水に伴う増水時の渓流水の成分濃度の変化
  • ミナミニホン タイヘイヨウガワ ノ サンチ ショウリュウイキ ニ オケル コウスイ ニ トモナウ ゾウスイジ ノ ケイリュウスイ ノ セイブン ノウド ノ ヘンカ

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Abstract

Storm solute behavior of a small forested catchment with steep hillslopes and abundant rainfall in summer was investigated in hilly country of southern Kyushu. Inorganic ion concentrations for twelve storm events were analyzed for a year. The stream water chemistry of this catchment was characterized by: 1) independent increase or decrease pattern of storm solute concentrations on season, rainfall, discharge before precipitation and antecedent precipitation index; 2) remarkable nitrate concentration rise at flooding in summer; 3) marked flushing effects. These characteristics are probably due to predominant soil water during the events and abundant rainfall and higher temperature in summer.

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