Definitions and Descriptions
In cross-sections of freshly felled mature trees a number of zones can usually be observed, a pale-colored outer zone — the sapwood — and a dark-colored inner core that is often situated concentrically — the heartwood. Both these zones change in appearance on storage and always become darker, especially with some of the heartwoods of hardwood species. Between these major zones there may be a third zone, depending on the species, either an intermediate zone of wood of varying colors and width, or a transition zone paler in color than the surrounding tissues and narrow in width.
KeywordsGrowth Ring Sapwood Area Heartwood Formation Resin Pocket Crown Class
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