A produção florestal e agroflorestal do Cumaru (Dipteryx spp.): estudo de caso em três regiões do Estado do Pará

Abstract

The study aimed to reduce uncertainties in the estimation of productivity and economic viability of the use of cumaru (Dipteryx spp.) In three regions of the State of Pará. The forest stock was estimated using volume equation and cumaru tree density in Portel and Novo Progresso. In addition to seed productivity in plantations in the region of Santarém and the opportunity cost for adopting SAFs by family farmers (AF) in the western region of the State. Deforestation data were used to estimate forest stock losses in Portel and Novo Progresso and productivity in SAFs was measured by the current annual increment (ICA) and the mean annual increment (IMA) in four SAFs with cumaru in Santarém. In order to estimate the economic viability and the opportunity cost, the net present value (VLP), the benefit-cost (B / C), annual equivalent value (EVA) and the internal rate of return (IRR) were used. The species cumaru (Dipteryx spp.) was rare in the forests of Portel, Altamira and Novo Progresso with less than one individual per hectare. The Spurr equation was selected to estimate trunk volume of DAP trees between 10-17 cm and adult trees with DAP between 70.66-113.65 cm. The D. odorata species, at six years of age, had superior behavior in the ILPF system in relation to the SAFM system with D. punctata, both in diameter development (DAP), height (Ht) and volume (Vol.) By the test t of averages with ρ = 0.05. The ICA and IMA of the volume were higher for the ILPF system (D. odorata) than the others, but fruit yield was higher for D. punctata (SAFM) in the period of 2015 and 2017. The evaluated systems and SAFs) were economically viable. Among traditional land use systems in the Novo Progresso region, banana cultivation (SMB) had a higher yield than cassava root (SMRM) production. This system (SMB), also obtained the best performance in relation to the systems of alternative use with cumaru to the four years of culture. The opportunity cost, or loss, was considered low in relation to the second option with better economic performance (SAF2). In the analysis considering the cycle of eight years the best alternative was the system the alternative system (SAF3) that consists of the evolution of SAF2 that adopted cumaru associated to the initial production of banana and cupuaçu.