Planejamento da colheita florestal: o uso da programação inteira

Abstract

Forest harvest is the activity with the largest share in timber cost. Meanwhile, obsolete techniques have been applied in Brazil for the development of the forest harvest plan. This here study was carried out in a Eucalyptus urophylla forest, located in Bocaiúva town, north ofMinas Gerais state, Brazil. The first goal of this study was to develop a mathematical model to support harvest plan's decision-making for two years. The proposed model seeks the best alternative for reducing fell cost of feller-buncher forest tractor, attending the company's demand on wood. Integer Programming technique known as Mixed Integer Programming was used. The cost of feller-buncher was US$17.27for total clock hour and US$ 25.58 for each effectively worked hour. Increasing forest productivity tends to reduce feller-buncher's área productivity.. On the other hand, wood cost tends to reduce in function the increase in lhe volume of hourly-felled wood. Forty six áreas were selected by the APCF 1 model to be harvested during the first year and forty two in the second year, from a total of204 available áreas, with feller cost amounting to US$ 91,942.00 and US$ 79,379.00 respectively. This work demonstrated that the best productivity level to be felled is one above 150 st/ha and that decision-making can reduce cost by about US$ 70,000.00 per year. The developed model can be used to support forest planning in any time lapse, allowing for quick planning adjustments as for external changes.