研究資料（Research Material）


関東育種基本区から選抜されたスギ精英樹クローンの材質に関する解析資料

平川 泰彦・藤澤 義武・中田 了五・山下 香菜

Analyzed Data Relative to Wood Properties of Sugi Clones Selected from Plus Trees in Kanto Breeding Region

HIRAKAWA Yasuhiko, FUJISAWA Yoshitake, NAKADA Ryogo and YAMASHITA Kana 　　


Abstract
Wood properties of plus tree clones(the clones totaled 563 and trees 1,060 respectively) of sugi(Cryptomeria japonica) which were thirty years old and planted in the Forest Tree Breeding Center at Mito city were investigated. The grafted or cutting clones were prepared from sugi plus trees which were selected all over Kanto Breeding Region(a part of Tohoku Region, Kanto Region, Koshin Region and Tokai Region). Annual ring width, latewood percentage, basic density, moisture content of green wood, heartwood percentage, heartwood color indexes, modulus of elasticity(MOE) and modulus of rupture(MOR) in bending, tracheid length and microfibril(Mf) angle of S2 layer in tracheids were examined in samples removed from short length logs(50cm in length) at 1.8m height. Dynamic modulus of elasticity(Efr) was measured in first logs(1.8m in length). The coefficient of variation among trees was large(over 30%) in heartwood moisture content, annual ring width(outerwood), latewood percentage(outerwood) and Mf angle(outerwood), rather large in log Efr(17.5%) and MOE of small clear samples in bending(25.6%), but small(under 15%) in basic density, heartwood percentage, heartwood color indexes and tracheid length. The variation of wood properties in sugi plus tree clones reported in this study should reflect the characteristics of young plantation-grown sugi trees in Japan. It is suggested that high moisture content in heartwood and low Efr of logs which are serious problems in utilization of thinnings can be improved by tree breeding.

Key words : Sugi tree, Wood property, Plus tree clone, Plantation-grown tree

要　旨
　水戸市の旧林木育種センター育種素材保存園に植栽されていた約30年生のスギの精英樹クローン、563クローン1060個体を対象に基礎材質を調べた。年輪幅、晩材率、密度、生材含水率、心材率、心材色、無欠点小試験体の曲げヤング係数と曲げ強度、仮道管長、仮道管の二次壁中層のミクロフィブリル傾角及び丸太の動的ヤング率について測定を行い、解析した結果をFig.1 〜 Fig.45に示した。本研究資料では、スギの材質に関連する多くの性質の標準的な値と変動の幅、さらには各性質間の関係を明らかにした。

キーワード：スギ、材質、精英樹クローン、造林木

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