O valor econ？mico da extra？？o manejada de madeira no baixo Amazonas, estado do Pará

the objective of this study was to estimate the economic value and the trade margin of roundwood from managed areas. besides generating a positive margin values, they are relatively higher in this chain than those generated in activities contributing to deforestation in the amazon. additionally, the unfolding mean rate of 37.3% was achieved (2.68 m3 of logs for each 1.0 m3 of sawn timber), which revealed a low technological level of companies. at the lower amazon, the average economic value from the extraction and sale of standing timber in the local market was r$ 23.48/m3, with a minimum value of r$ 9.06/m3 for the species in category c4 (softwood) and a maximum of r$ 55.63/m3 for the species of category c1 (special wood). thus, considering an extraction flow of 30 years and assuming the extraction of 25 m3/ha in management designs of forest areas from concession contracts in the state of pará, it is generate an average economic value of r$ 587.00/ha or r$ 19.56/ha/year, which is relatively higher than the profit generated by the activities of extensive livestock (around r$ 180.00 per hectare or r$ 6.00/ha/year) and grain crops (approximately r$ 420.00 per hectare or r$ 14.00/ha/year), which are the main responsibles for deforestation in the amazon. it also presents a higher profitability than the reforesting with paricá, whose income is r$ 192.26/ha or r$ 7.12/ha/year. the marketing margin showed that society tends to appropriate of 14.30% of the economic value generated in the wood chain from the transition contracts.