Duration of juvenile period in diameter growth of trees selected coniferous species

The result of the tests was determination of the width of the juvenile wood zone in trees of various coniferous species, originating from even-aged stand and from the same biosocial class. The boundary between juvenile wood and mature wood was determined based on the measurements of the tracheid length variability. Thirty measurements of the length of earlywood and latewood tracheids were carried out for each tested ring. For all tested wood species the tracheids of earlywood were shorter, compared to latewood tracheids. The zone of juvenile wood was determined based on a two-segment linear regression. In all tested species this zone was formed within a similar period and encompassed the first 25 to 28 annual rings.

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