Variations in some wood anatomical features, specific gravity, extractive content and transverse shrinkage in Benguet pine (Pinus kesiya Royle ex Gordon) from a second growth forest
1988
Aday, J.U.
A general lack of proportionality in the changes in cell dimensions and shrinkage in the respective planar direction was observed. Cell dimensions in the tangential and radial direction and the T/R [Tangential / Radial] ratio of cell-wall thickness and lumen diameter failed to correlate with the shrinkage property in the respective planar direction. The stepwise regression analysis showed that extractive content and percent latewood had a significant effect on tangential and radial shrinkage of gross wood. The low coefficients of determination pose a limitation on the predictive value of the regression equations. Those were taken to indicate mutual modification among the effects of cell dimensions, percent latewood and extractive content. The partial correlation analysis demonstrated the masking effect of extractive content on the relationship of tangential and radial shrinkage with cumulative wall thickness per mm, number of double-wall per mm and cell-wall proportion in the respective planar direction. The effect of percent latewood on radial shrinkage of gross wood also appeared to be an overriding factor in the shrinkage-wood anatomy relationship. The T/R ratios of cumulative wall thickness, number of double-wall and cell width in the earlywood and the T/R ratios of cumulative wall thickness and cell-wall proportion in the latewood significantly affected shrinkage anisotropy of the gross wood. The cell form factor or the tangential to radial cell-width ratio between latewood and earlywood significantly correlated with the T/R ratio of shrinkage
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