Tension Wood In Hardwoods

Tension wood reaction wood.

Tension wood in hardwoods. Tension wood forms on the upper sides of hardwoods and contains more cellulose than normal wood. Science and technology 2001 tension wood is found on. Reaction wood in hardwoods is termed tension wood. In hardwoods there is generally less eccentricity associated with tension wood but the annual rings may be wider.

The tension wood is formed on the upper side of the leaning tree and is believed to be a physiological response to gravitational forces. Compression wood is rich in lignin while tension wood is rich in. Longitudinal stress results because the wood is shrinking longitudinally. Key differences reaction wood in angiosperms is tension wood and reaction wood in gymnosperms is compression wood.

Bruce hoadley s understanding wood reaction wood forms predominantly toward the upper side of the leaning stem. In gymnosperms and amborella it is called. The wood glues well and has good resistance to splitting when nailing and screwing. Trees that lean are uprooted bent from ice snow or trees growing on steep slopes may often have this eccentric reaction wood trait.

There are two different types of reaction wood which represent two different approaches to the same problem by woody plants. Compression wood is formed on the lower side of trunk while tension wood is formed on the upper side of trunk. It dries easily but may still have a tendency to warp with slight movement in performance. General machinability is fair although tension wood is frequently present and can cause a fuzzy surface when cut which in turn will require additional care when finishing.

Tension wood forms on the side of the part of the plant that. Conners in encyclopedia of materials. Longitudinal shrinkage results when reaction wood tension wood in hardwoods or compression wood in softwoods or juvenile wood is present in the lumber. Tension wood which occurs only in hardwoods is a special growth feature in the tree that involves the tree reacting to an outside force such as the wind another tree leaning against the tree.

Singh in secondary xylem biology 2016 tension wood has high longitudinal. Both strategies appear to work most of the time. Tension wood is 102. Wood with a high cellulose content is especially strong in tension and can resist bending downward.