ABSTRACT
This study presents an evaluation of total and assortment volumes per area unit, in stands of tinus taeda L. under different site conditions and planting density. The data are from a initial pacing experiment of Pinus taeda L. at Fazenda Lageado, Jaguariaiva-PR, owned by Pisa Florestal ompany. The initial spacings used were: treatment 1 (2,5 x 1,2m); treatment 2 (2,5 x 2,0m); treatment 3 (2,5 x 2,8m); treatment 4 (2,5 x 3,6m); and treatment 5 (2,5 x 4,4m). Six blocks were related to site conditions. The volume production was evaluated through the Randomized Complete Block Design to the present age of the stands, that is 8,75 years. Simulation results of each treatment production under extreme conditions of site were got by a growing and production imulator 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 veneer 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 as the volume for sawmill wood production. The simulations allowed to conclude that the site effect is more conspicuous in higher economically valuable wood production.
Key words:
initial spacing; site; Pinus taeda; simulation