| Radial and axial variation of tracheid length, relative density, ring width, radial and tangential shrinkage, and juvenile and mature wood volume were studied in a single stem of jack pine, 37 km north of Thunder Bay. The tree was 60-year-old and was from a naturally grown stand in the Jack Haggerty Forest of Lakehead University, Thunder Bay, Ontario. Specimens were taken from the tree stem at heights of 0.15, 1.4, 3.4, 5.4, 7.4, 9.4, 11.4, 13.4, 15.4 m along west and east aspect. Juvenile and mature wood boundary was demarcated by using the radial variation pattern of tracheid length as the criterion.; Tracheid length increased from pith outward in the juvenile wood, reaching a maximum, then remained constant or leveled off towards the bark in the mature wood. The values for percentage of juvenile wood volume at breast height can be used to predict the entire stem value. (Abstract shortened by UMI.)... |
