spruce tree growth rings horizontal cross section dried trunk |
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| navigate by keyword : growth rings annual tree spruce ring age wood bark cross trunk dried round concentric wave wavy time years cut stem pattern horizontal cambium dendrochronology radial anatomy structure texture analysis determination brown surface picea layers grow condition season life nature climate chronology sample botany agriculture forestry |
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| Spruce tree, growth rings, horizontal cross section. Cut through the dried trunk of an European spruce tree, Picea abies, showing annual rings, also called tree rings, expanding in a wave-like manner. |
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