Tree ring analysis of Araucaria angustifolia trees grown at the forest research station Sao Joao do Triunfo of the University of Parana has been carried out.
Disks were taken from 10 trees at the height of 2 m and on each disk 8 radii were used for measurement of ring width.
The preliminary results indicate that there is within-tree-variation in the ring series. The mean intra-correlation coefficient for the ring widths between the radii varied between 0.57 and 0.89.
A mean correlation of 0.60 for all pairs of trees was obtained indicating consistency in the index series between the trees. This made it possible to construct an average tree ring index for the stand.