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In botany, trunk (or bole) refers to the main wooden axis of a tree, which is an important diagnostic feature in tree identification, and which often differs markedly from the bottom of the trunk to the top, depending on the species. The trunk is the most important part of the tree for timber production. Trunks occur both in "true" woody plants as well as non-woody plants such as palms and other monocots, though the internal physiology is different in each case. In all plants, trunks thicken over time due to formation of secondary growth (or in monocots, pseudo-secondary growth). Trunks can be vulnerable to damage, including sunburn. Trunks which are cut down in logging are generally called ''logs'' and if cut to a specific length ''bolts''. File:Timber floating.jpg|Raft of timber logs File:Corylus avellana12.jpg|Cross section of a hazel bole File:A Lovely Rotting Log - geograph.org.uk - 998345.jpg|Log being decomposed by bracket fungi ==See also== * Basal area * Tree measurement * Tree volume measurement * Diameter at breast height 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Trunk (botany)」の詳細全文を読む スポンサード リンク
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