Avaliação econômica do uso de recursos florestais no planalto de Curuá-UNA: Amazônia brasileira.

Abstract

The purpose ofthis study is to evaluate the efficiency of two intensities of forest exploitation with and without silvicultural treatments, and at the same time identify the economic factores that can influency the optimum rate trajectory ofthe exploitation, as well considering the externai aspects. This work was developed at Curuá-Una Experimental Station, located in Prainha - Pará staíe. The data was obtained ffom a pre-exploratory inventory, carried out aí Curuá with 100 % mensuration for trees whith diameter at hight breast - (DHB), superior and equal to 45cm. For species with lOcm > DBH < 45 cm, the inventory was carried out using 90 samples of 0,25 hectare each. Exploitation evaluations were performed taking into account the economic aspects as well the private concems. In this studie the production (m3 of wood) and income from more frequent species in the area ofstudy was determined. The HOTELLING and FISHER theoretical model were used, aiming at to maximize gain and identify the "source" that provoke their deviations. The Net Flux of increment benefits, were obtained using these models and criteria of atualizations, to determine the economic viability on these explotationa activities. A comparative economic evaluation between private using indicatators like Net Present Value (NPV), Ratio of Benefits and Costs (Rb/c), and Internai Rate ofRetum (IRR). The results ofthese studies, showed that the selective forest explotation was better than the forest management sustainable, when utilized NPV and Rb/c. Based on these results is possible to conclude the selective exploitation showed more benefits values from financial invesments, and more retum ofnet resources per monetary unity (US$ 1,00). Therefore, this kind of explotation is economically viable. However ifthe IRR is used, the forest sustainable management will be more profitable than selective exploitation. Therefore, considering the actual cost and respectives indicators studied for private sectors the forest sustainable management showed more net benefits, more return per monetary unity and more profitability at the actual values.