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Live crown
The live crown is the top part of a tree, the part that has green leaves (as opposed to the bare trunk, bare branches, and dead leaves). The ratio of the size of a tree's live crown to its total height is used in estimating its health and its level of competition with neighboring trees.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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