OPTIMIZATION AND ECONOMIC ANALYSIS OF MULTIPRODUCTS OBTAINED FROM WOOD OF EUCALYPTUS STANDS UNDER DIFFERENT PRODUCTIVE CAPACITY CLASSES AND ROTATION AGES

Laíssa De Araújo Viana,Álvaro Nogueira De Souza,Lidiomar Soares Da Costa,Renato Vinícius Oliveira Castro,Carlos Pedro Boechat Soares,Maísa Santos Joaquim

doi:10.5380/rf.v51i2.63729

Abstract

The present study aimed to analyze the yield and economic viability of the destination, for lumber and energy, of the wood from non-thinned stands of the hybrid Eucalyptus urophylla x Eucalyptus grandis under different productive capacity class and whose production was projected by individual tree growth model to different ages. The simulation of the growth of individual trees was performed by applying the height and diameter growth, and mortality sub-models for three productive capacity classes: high, medium and low. The Kozak model was adjusted to study the stem taper and, in addition, used to optimize patterns for sawing logs and to produce lumber. The economic viability of the projects was evaluated by Net Present Value, Equivalent Periodic Benefit and risk analysis using the Monte Carlo method. It was observed that in areas with less productive capacity the volume of wood destined for energy was greater than 80% and, in areas with greater productive capacity the volume of lumber was greater than 26%. Economic indicators showed that the lumber production was viable at any of the studied rotation age. The risk analysis using the Monte Carlo method did not indicate the possibility of the project being unfeasible under the conditions analyzed. The quantity of different types of products obtained and the wood yield depends on the productive capacity class and age of the stand. The destination of the wood for multiproducts is the most viable option, regardless of the productive capacity class.

Highlights

Eucalyptus, due to its timber potential and high growth rates (STAPE et al, 2010), is the forest genus with the largest planted area in Brazil, occupying an area of 5.67 million hectares, which represents 72.3% of reforested areas (IBÁ, 2017)
The objective of the present study was to carry out an analysis of the yield and economic viability of the destination for lumber and energy, of the wood coming from stands of Eucalyptus urophylla x Eucalyptus grandis not thinned under different productive capacity class and whose production was projected by individual tree growth model for different ages
The estimates of quadratic mean DBH, total height, stand density and total volume projected for each productive capacity class between the ages of 72 and 120 months are shown in Table 4, as well as the yield and type of wood destination

Summary

Introduction

Eucalyptus, due to its timber potential and high growth rates (STAPE et al, 2010), is the forest genus with the largest planted area in Brazil, occupying an area of 5.67 million hectares, which represents 72.3% of reforested areas (IBÁ, 2017) When it was introduced in the country, eucalyptus was used only as firewood, fence posts and railroad ties, it is currently characterized by the supply of a great diversity of products, such as: charcoal, firewood, paper and cellulose, panels, furniture, laminates, fence posts, props, wainscoting, oil for the production of medicines, cosmetics and food products, among others (IBÁ, 2017). This multiplicity of uses allows the forest producer greater flexibility regarding the commercialization of products that have different market values. Variations in demand over the years, especially for small and medium-sized producers, can guarantee greater profitability and lower risks in the commercialization of forest production (SOARES et al, 2003)

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