Abstract
Our studied materials were tested on wood specific gravity of fifteen, 38-yr-old red pine trees from central Wisconsin and on tracheid length of fifteen, 39-yr-old Taiwan red-cedar trees from central Taiwan. An increment core sample was removed from each red pine sample tree in September 1995 and each Taiwan red-cedar sample tree in November 1994. All increment core samples were then separated into individual growth rings and their wood properties determined. An analysis of variance was conducted on each set of wood data generated by varying the number of growth rings from 28 to 2 in the working sample for red pine and from 20 to 3 in the working sample for Taiwan red-cedar. The age of the juvenile-mature wood transition was set at a point where the variance component due to the effect of ring position reached 0%. The transition age between the 2 wood zones was at the 25th growth ring for red pine specific gravity arid at the 33rd growth ring for Taiwan red-cedar tracheid length. This new method was proposed elsewhere, but not only worked for different coniferous species but also for different wood properties.
Published Version
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