secondarygrowth213-page9

secondarygrowth213-page9 - Compression wood forms when...

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Secondary Growth in Stems: Wood, Bark and Surface Features - 9 Vessel distribution and vessel size in wood are other features that lend “character” to wood. Ring porous wood has an abrupt transition between spring and summer wood. Spring vessels are distinctively large and fewer in number, and the summer vessels are numerous and small. The vessels in diffuse porous wood are produced more uniformly in both spring and summer wood. Ring porous wood Diffuse porous wood Reaction Wood Growth rings can be uneven if the stem has an obstacle, such as a huge rock on one side that inhibits expansion, or if the stem is leaning in one direction.
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Unformatted text preview: Compression wood forms when there is more growth in the lower side to compensate and straighten the stem. Tension wood forms when there is more growth on the upper side of the bend to "pull" the stem upright. Reaction Wood Many trees native to tropical regions that have a uniform climate, such as the tropical rain forests, may not have annual growth rings, and have a fairly uniform grain. Tropical trees that grow in areas with seasonal climates do have growth rings, although the seasons may be wet/dry rather than cold/warm...
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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