Nitrogen dynamics in Japanese cedar and Hinoki cypress plantations on a precipitation gradient in Shikoku District

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  • Inagaki Yoshiyuki
    Shikoku Research Center, Forestry and Forest Product Research Institute
  • Miura Satoru
    Forestry and Forest Product Research Institute
  • Yamada Tsuyoshi
    Shikoku Research Center, Forestry and Forest Product Research Institute
  • Kodani Eiji
    Shikoku Research Center, Forestry and Forest Product Research Institute

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  • 四国地域において降水量がスギとヒノキ林の窒素動態に及ぼす影響
  • シコク チイキ ニ オイテ コウスイリョウ ガ スギ ト ヒノキバヤシ ノ チッソ ドウタイ ニ オヨボス エイキョウ

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Abstract

Soil pH, total carbon, total nitrogen and net nitrogen mineralization were measured in Japanese cedar (Cryptomeia japonica D. don) and Hinoki cypress (Chamaecyparis obtusa Endlicher) plantations on a precipitation gradient (1,690〜3,300mm) in Shikoku District. Net nitrogen mineralization rates by a laboratory incubation (25℃, 14-31days) showed substantial differences among forests ranging from 0.2 to 2.5mg N kg^<-1>d^<-1>. In high precipitation areas, soils had larger C/N ratio, lower nitrate pool and nitrogen mineralization rates than in low precipitation areas. This indicates that forest ecosystems in high precipitation areas have efficient nitrogen cycling with small nitrogen losses.

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