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Silva Lusitana

versão impressa ISSN 0870-6352

Resumo

OLIVEIRA NETO, Sílvio Nolasco de et al. Tree Modeling and Economic Evaluation of Agroforestry Systems in Southeastern Brazil. Silva Lus. [online]. 2013, vol.21, n.1, pp.43-60. ISSN 0870-6352.

In this study, the authors aimed to apply a consistent, efficient and biologically correct model to estimate growth and yield of the tree component from eucalypt-based agroforestry systems and, through economic indicators, analyze and evaluate its products. The systems were composed by hybrid clones of Eucalyptus spp. in 10 x 4 m spacing, integrated with rice, soybean and pasture. The equation system developed by CLUTTER (1963) was used as the starting point for estimating growth and yield of Eucalyptus wood. The model application resulted in accurate estimates for both basal area and future volume, with adjusted coefficient of determination of 0.908 and 0.956, respectively. The economic criteria used in the analysis were the internal rate of return (IRR), the net present value (NPV), the equivalent annual value (EAV) and the benefit-cost ratio (B/C) with discount rates of 6, 8, 10 and 12 %. The agroforestry systems were economically viable considering all studied indicators and discount rates. Lastly, changes in the discount rate affect the systems profitability, so that the lower the rate, the higher the economic return.

Palavras-chave : agrosilvopastoral system; forest inventory; forest economy.

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