SIMULATION AND ECONOMIC EVALUATION OF THINNING REGIMES FOR Pinus taeda FOR OBTAINING WOOD MULTIPRODUCTS

Abstract

This study had the objective of simulating and evaluating, on the economic point of view, thinning regimes for Pinus taeda for obtaining wood multiproducts. The study area, is located in the county of Jaguariaiva, State of Paraná - Brazil. Three sceneries with different numbers, time and thinning intensities from different initial planting densities at different levels of productivity were tested. The management regimes were submitted, in the investment analysis, to 3 discount rates, for plantations on level and on rough lands, as well as, on rented and on own lands, totaling 133,920 different management options. The growth and yield values were obtained and thinning simulations were made by the PISAPRO software. The economic analysis were performed through the maximization of the present net value by using the INVEST software. The management regimes, which presented the highest profitability for the site class I, for specified production costs and prices, were those with planting of 1667 trees per hectare, and final cutting at 21 or 22 years after 2 thinning operations: the first one at 12 years old remaining 800 trees/ha and second one at 14 years old maintaining 400 to 600 trees/ha. For the site II, the best option was the adoption of the management regime with planting 1667 trees/ha, and final cutting at 22 years after 2 thinning operations: the first one at 12 years of age maintaining 800 to 900 trees/ha and second one at 14 years maintaining 400 trees/ha. For the site III, the best option was the adoption of the management regime with planting 1333 trees/ha, and final cutting at 22 years after 2 thinning operations: the first one at 12 years of age maintaining 800 to 900 trees/ha and second one at 14 years maintaining 400 to 500 trees/ha. For the sites IV and V, there was no profit for any one management regimes tested.