Differences in moisture content and shrinkage between outerwood, middlewood, and corewood of two yellow-poplar trees
1995
Shupe, T.F. | Choong, E.T. | Gibson, M.D.
Corewood, middlewood, and outerwood samples were obtained from two yellow-poplar trees (Liriodendron tulipifera L.). Disks were taken at various tree heights from each tree and dissected along a north and south radius, and observations were made from pith to bark along each radii. Green moisture content (MC), specific gravity (SG), and shrinkage in the radial and tangential direction were determined. Volumetric shrinkage and SG decreased from outerwood to middlewood to corewood. Moisture content generally decreased from corewood to middlewood to outerwood. Tree 1 showed a much larger difference between the MC of the corewood and outerwood than tree 2. Between the trees, the MC, SG, and tangential shrinkage were significantly different for all wood-types except outerwood. Volumetric shrinkage was not correlated to SG for either corewood, middlewood, or outerwood but was slightly correlated with the data of all wood-types combined for the trees individually and collectively. MC, SG, and volumetric shrinkage were not consistently correlated with height. MC and SG were found to be negatively correlated for all wood-types of tree 1.
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