YELD AND ASSORTMENT EVALUATION OF Pinus teada L. STANDS WITH DIFFERENT INITIALS SPACING AND SITE-QUALITY

Abstract

This study presents an evalution of total and assortment volumes per area unit, in stands of Pinus teada L. under different site conditions and planting density. The data are from a initial spacing experiment of Pinus taeda L. at Fazenda Lageado, Jaguariaiva- PR, owned by Pisa Florestal company. The initial spacings used were: treatment 1 (2,5 x 1,5m); treatment 2 (2,5x 2,0m); creatment 3 (2,5 x 2,8m); treatment 4 (2,5 x 3,6m); and treatment 5 (2,5x 4,4m). Six blocks were celated to site conditions. The volume production was evaluated the Randomized Complete Block Design to the present age of the stands, that is 8,75 years. Simulation results of each creatment production under extreme conditions of site were got by a growing and production simulator called “SISPINUS”. The production simulations were made until 15 years old, not considering thinnings. At the present age of the stands, assortment analysis showed that large spacing implies an increasing sawmill and venner volumes. The simulation showed that, in the future, the treatments would have a similar effect on thick wood production, if no thinning was carried out. Narrower spacing increased total volume production, at any age of evaluation. The design analysis at the present age clearly showed the effect of the blocks on total volume production as well the volume for sawmill wood production. The simulations allowed to conclude that the site effect is more conspicuous in higher economically valuable wood production.