Ring-porous wood

Japanese: 環孔材 - かんこうざい
Ring-porous wood

…There are three types of vessel arrangement, and the arrangement is determined by the tree species. When viewed from the butt end, in ring-porous wood, the main vessels are arranged along the boundaries of the annual rings (chestnut, zelkova, etc.), in diffuse-porous wood, the vessels are arranged randomly (beech, makamba, etc.), and in radial-porous wood, the vessels are arranged radially (oak, chinquapin, etc.). Among hardwoods, only one species, the Japanese quince, is an exception, as it does not have vessels like conifers. …

*Some of the terminology that refers to "ring-porous materials" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…道管の配列には3種類あり,樹種によって並び方が決まっている。木口面を見た場合,環孔材はおもな道管が年輪の境目にそって並び(クリ,ケヤキなど),散孔材は分散してばらばらに並び(ブナ,マカンバなど),放射孔材は放射状に並ぶ(カシ,シイなど)。広葉樹の中でただ1種ヤマグルマだけが針葉樹のように道管をもっていない例外である。…

※「環孔材」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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