スギコンテナ苗は夏季植栽で本当に有利か?:―植栽時の水ストレスから1年後の活着・成長・物質分配までの比較―  [in Japanese] Are Containerized Cuttings Advantageous for Summer Planting?::Comparisons of Physiological Stress, Growth and Dry Matter Allocation with Bare-root Cuttings  [in Japanese]

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Abstract

<p>夏季植栽におけるコンテナ苗の優位性を検証するため,スギ挿し木コンテナ苗 (1年生および当年生) とスギ挿し木裸苗を9月に植栽し,植栽直後の生理的ストレスと植栽後1年間の成長を比較した。裸苗の水ポテンシャルは植栽直後に大きく低下し,その後1カ月間,コンテナ苗よりも低い値で推移した。しかし,水ポテンシャルの低下は,枯死に至る致命的なストレスとはならなかった。植栽当年の苗高は1年生コンテナ苗で最も大きく,次いで当年生コンテナ苗であり,裸苗が最も小さかったが,植栽翌年には裸苗の伸長成長量が最も大きかったことから,植栽1年後の裸苗と当年生コンテナ苗には苗高差がみられなくなった。また,植栽時は苗の地上部および地下部の各器官の配分が苗種間で異なっていたが,植栽1年後には差がなくなった。さらに,植栽当年は1年生コンテナ苗で傾斜被害が多く,裸苗では主軸先端の萎れや枯れがみられ,健全苗の割合に苗種間で差が生じていたが,植栽1年後には差がみられなくなった。以上のことから,コンテナ苗は裸苗よりも乾燥に対する耐性が強いと考えられたが,今回の乾燥条件においては,夏季植栽におけるコンテナ苗の優位性は示されなかった。</p>

<p>We investigated the early performance of current and one-year-old containerized sugi cuttings planted in late summer (September) and compared it with that of current-year bare-root cuttings. The leaf water potential of bare-root cuttings declined abruptly after the planting, and remained lower than that of the containerized cuttings for the following one month, but this water stress did not result in tree death. One-year-old containerized cuttings had the tallest tree height at planting, followed by current-year containerized cuttings and bare-root cuttings. However, the height growth during the second growing season was largest for bare-root cuttings, which resulted in no significant difference in tree heights at one year after planting among the cutting types. The difference in the dry matter allocation to above- and below-ground parts among the cutting types observed at planting also disappeared one year after the planting. At the end of the planting year, we observed a larger incidence of inclination damage for one-year-old containerized cuttings, and of the symptom of wilting in apical shoots for bare-root cuttings. However, these differences also disappeared one year after the planting. We concluded that the superiority of the containerized cuttings in summer planting was limited, at least under the moderate/light drought conditions for the case of the present study, though the containerized cutting implied more tolerance to dryer conditions.</p>

Journal

  • Journal of the Japanese Forest Society

    Journal of the Japanese Forest Society 98(4), 151-157, 2016

    THE JAPANESE FORESTRY SOCIETY

Codes

  • NII Article ID (NAID)
    130005420404
  • NII NACSIS-CAT ID (NCID)
    AA12003078
  • Text Lang
    JPN
  • Article Type
    journal article
  • ISSN
    1349-8509
  • NDL Article ID
    027644584
  • NDL Call No.
    Z18-340
  • Data Source
    NDL  J-STAGE  JASI 
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