Before the importance of knowing the respective regions of juvenile and mature wood for the wood industry, this study was conducted with the objective of defining, through methodologies of regression lines and annual increment, the regions of juvenile and mature wood of açoita-cavalo, pecan and sycamore. The anatomical parameter used in the delimitations was fiber length. In addition, others anatomical properties were measured: fiber diameter, lumen diameter and fiber thickness. The fiber properties were statistically described according to the difference between woods proposed in each methodology, for comparison purposes. According to methods of regression lines and annual increment, the segregation ages between woods were 21 to 19 years for açoita-cavalo and 16 to 14 years for pecan. For sycamore wood, both methodologies defined that the wood segregated with 14 years. It may be verified that there was no difference between the results obtained with the two delimitation methodologies of juvenile and mature woods, except for fiber length of juvenile wood. The method of annual increment was considered preferred due to the error source verified in the regression lines.
Luehea divaricata; Carya illinoinensis; Platanus acerifolia
