Accumulation patterns of soil carbon and nitrogen in a Japanese oak (Quercus crispula) plantation in eastern Hokkaido : Analyses using continuous 0-40 years old stands

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  • Ohtsu Hiroaki
    Forest Environmental Sciences, Agro-Environmental Sciences, Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University
  • Hishi Takuo
    Kyushu University Forests, School of Agriculture, Kyushu University
  • Tashiro Naoaki
    Kyushu University Forests, School of Agriculture, Kyushu University
  • Inoue Sachiko
    Kyushu University Forests, School of Agriculture, Kyushu University
  • Cho Keiichiro
    Kyushu University Forests, School of Agriculture, Kyushu University
  • Ogata Taketo
    Kyushu University Forests, School of Agriculture, Kyushu University
  • Mabuchi Tetsuya
    Kyushu University Forests, School of Agriculture, Kyushu University
  • Enoki Tsutomu
    Kyushu University Forests, School of Agriculture, Kyushu University

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Other Title
  • 北海道東部のミズナラ造林地における土壌の炭素および窒素の蓄積様式 : 連続した0～40年生林分を用いた解析
  • ホッカイドウ トウブ ノ ミズナラ ゾウリンチ ニ オケル ドジョウ ノ タンソ オヨビ チッソ ノ チクセキ ヨウシキ : レンゾク シタ 0~40ネンセイリン ブン オ モチイタ カイセキ

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Abstract

This study assessed the effect of the change in forest structure including understory vegetation of Sasa nipponica on soil C and N accumulation from 0 to 40-yr Japanese oak (Quercus crispula) plantation chronosequence. The peak of understory biomass was at 7 years after afforestation. Biomass of the overstory species linearly increased, and the biomass of overstory species was more than that of understory species after 8-yr. According to leaf mass index change along with stand age, canopy closure was occurred about 12 years after afforestation. The ranges of temporal changes in both soil C and N accumulations increased from surface to deep soil layers. The changes in C and N accumulation of O layer were large during early stage of stand development, and C and N accumulations increased until 10 years and 20 years after afforestation, respectively. Overstory leaf mass positively correlated with C and N accumulations in O layer. Understory biomass negatively correlated with N accumulation in O layer and positively correlated with C/N ratio. The N accumulations both in mineral soil 0-4 and 4-8cm in depth were negatively correlated with fine root mass of S. nipponica. The results suggested that change in vegetation structure such as canopy closure by overstory and dynamics of understory biomass affected soil C and N accumulations.

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