Growth rings on scots pine trunks

Growth rings on scots pine trunks

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Cross section through the trunks of scots pine trees Pinus sylvestris a common softwood. The difference between the heart wood (dark) and the sap wood (light) is seen clearly. Sap wood is saturated with water and contains the living cells of the conducting tissue. After 10-15 years sap wood is converted into heart wood, which is a completely lifeless, dry tissue. Because it is dry and less likely to warp or crack, heart wood is preferred in the timber trade. Hardwood trees such as oak contain more heart wood than the softwoods & are preferred as timber. The concentric rings here correspond to annual growth rings, a count of which would indicate the age of the tree.

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Keywords: botany, growth ring, heartwood, log, logs, nature, pine, pinus sylvestris, plant, plants, sap wood, scots, scots pine, softwood, tree rings, type, wood

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