Tree growth rings

Tree growth rings

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Caption: Tree growth rings. Close-up of the rings of a silver fir tree (Abies alba), which were exposed by cutting across a tree trunk or branch. Each tree ring represents a period of growth in which the tree formed new wood. Each year the outer part of a tree trunk, the living part, lays down a new layer. The older layer dries out and dies, forming the hard mass of wood in the core of a trunk, the heart wood. Each ring corresponds to a single year and allows the age of the tree to be calculated. A ring varies in width according to the climate that year. Photographed at the Centre of Alpine Ecology, Trento, Italy.

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Keywords: abies alba, age, annual, botany, branch, centre of alpine ecology, chronological, chronology, cut, dendrochronology, growth ring, italian, italy, log, nature, plant, plants, rings, section, sectioned, silver fir, tree, trento, trunk, wood, yearly

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