Correlation between Height: diameter Ratio and Shoot Growth in Containerised and Bare-root Seedlings of <i>Cryptomeria japonica</i>

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  • Yagihashi Tsutomu
    Tohoku Research Center, Forestry and Forest Products Research Institute (FFPRI)
  • Nakaya Tomoki
    Department of Geography, Ritsumeikan University
  • Nakahara Kenichi
    Tohoku-Hokkaido Branch Office, Forest Management Center, Forestry and Forest Products Research Institute
  • Nasuno Shun
    Tohoku-Hokkaido Branch Office, Forest Management Center, Forestry and Forest Products Research Institute
  • Hitsuma Gaku
    Forestry and Forest Product Research Institute
  • Noguchi Mahoko
    Tohoku Research Center, Forestry and Forest Products Research Institute (FFPRI)
  • Yagi Takanobu
    Tohoku Research Center, Forestry and Forest Products Research Institute (FFPRI)
  • Saitoh Tomoyuki
    Tohoku Research Center, Forestry and Forest Products Research Institute (FFPRI)
  • Matsumoto Kazuma
    Tohoku Research Center, Forestry and Forest Products Research Institute (FFPRI) Association of International Research Initiatives for Environmental Studies
  • Yamada Takeshi
    Forestry and Forest Product Research Institute
  • Ochiai Yukihito
    Forestry and Forest Product Research Institute Sumitomo Forestry Co., Ltd.

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Other Title
  • スギコンテナ苗と裸苗の成長と形状比の関係
  • スギコンテナ ナエ ト ラ ナエ ノ セイチョウ ト ケイジョウヒ ノ カンケイ

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<p>Previous studies revealed that in terms of the stem height growth, containerised seedlings with an average height:diameter ratio(HDR)of ca. 60 are superior to conventional bare-root seedlings and containerised seedlings with an average HDR of ca. 100 are inferior to conventional bare-root seedlings. In this study, we focused on the correlation between the stem growth and HDR in individual seedlings. We measured the stem growth of 2-year-old containerised seedlings and 3-year-old conventional bare-root seedlings for four growth seasons. In each of the growth seasons, HDR showed a negative correlation with stem height growth rate and a positive correlation with the stem radial growth rate of an individual seedling; the strongest correlation was observed in the first and second growth seasons. Therefore, the seedling with a high HDR allocated resources to stem radial growth rather than to height growth. Regarding the stem height growth, we analysed the sequential data for four growth seasons using a linear mixed effects model. HDR showed a negative correlation with the stem height growth. In conclusion, high HDR had negative effects on not only the relative height growth rate but also on the actual height growth.</p>

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