Black-Heartwood Formation and Ash Content in the Stem of Sugi (Cryptomeria japonica D. Don) II. : Heartwood Properties of Three Sugi Cultivars

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  • Morikawa Take
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Oda Kazuyuki
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Matsumura Junji
    Department of Forest Products, Faculty of Agriculture, Kyushu University
  • Tsutsumi Juichi
    Department of Forest Products, Faculty of Agriculture, Kyushu University

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  • スギ樹幹における黒心材形成と灰分(第2報) : スギ3品種心材の性質
  • スギ ジュカン ニ オケル コクシンザイ ケイセイ ト ハイブン ダイ 2 ホ

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Abstract

Three cultivars of sugi (Cryplmeria japonica), including 20 trees of cv,Yabukuguri, 20 trees of cv.Urasebaru and 22 trees of cv.Nakamura, were examined. Diameter at breast height and lightness, green moisture content, ash content, hot water extractives and potassium content in the heartwood were determined. Correlations between these factors were then discussed. 1) Some cv.Yabukuguri heartwoods and all cv.Nakamura heartwoods was black-colored and weakly alkaline (pH : 7.3～8.0). It is thought that black-heartwood contains so much ash (especially potassium) that it is weakly alkaline. 2) Lightness values of heartwood were constantly high with low potassium content. However the values decreased as potassium content increased. They were then constantly low with high potassium content. 3) There was a significant correlation between ash content and potassium content in heartwood. 4) Ash content in the heartwood varied among cultivars. Furthermore, it was significantly correlated to diameter at breast height within a cultivar grown in the same stand. Namely, the amount of inorganic matters absorbed in heartwood was affected by hereditary factors and locational conditions or environmental factors related to diameter growth. However it is thought that the degree of impact of environmental factors on alkaliztion of heartwood varied among cultivars.

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