Abstract:The Eschweilera genus has great ecological and economic importance due to its wide abundance in the Amazon basin. One potential use for the Eschweilera genus is in forest management, where just a few trees are removed per hectare. In order to improve the forest management in the Amazon, this study assessed two critical issues: volume equations fitted for a single genus and the development of a non-destructive method using climbing techniques. The equipment used to measure the sample trees included: climbing rope, ascenders, descenders, and carabiners. To carry out the objectives of this study, 64 trees with diameter at breast height (DBH) ≥ 10 cm were selected and measured in ZF-2 Tropical Forestry Station near the city of Manaus, Brazil. Four single input models with DBH and four dual input models with DBH and merchantable height (H) were tested. The Husch model (V = a × DBH b ) presented the best performance (R 2 = 0.97). This model does not require the merchantable height, which is an important advantage, because of the difficulty in measuring this variable in tropical forests. When the merchantable height data are collected using accurate methods, the Schumacher and Hall model (V = a × DBH b × H c ) is the most appropriated. Tree climbing techniques with the use of ropes, as a non-destructive method, is a good alternative to measure the merchantable height, the diameter along the stem, and also estimate the tree volume (m 3 ) of the Eschweilera genus in the Amazon basin.
-We aimed in this work to study natural populations of copaiba (Copaifera multijuga Hayne) on the Monte Branco mountain at Porto Trombetas-PA, in order to support sustainable management and the exploitation of oleoresin from copaiba. We studied the population structure of copaiba on hillsides and valleys of the south face of Monte Branco, within Saracá Taquera National Forest, where bauxite ore was extracted in the biennium 2013-2014 by Mineração Rio do Norte (MRN). We produced a 100% forest inventory of the specie and of oleoresin extraction in order to quantify the potential production of the remaining area. The density of copaiba individuals with DBH > 30 cm was 0.33 individuals per hectare in the hillside and 0.25 individuals per hectare in the valley. Both environments presented a density of 0.28 individuals per hectare. The average copaiba oleoresin yield was 0.661±0.334 liters in the hillside and 0.765±0.280 liters in the valley. The average value of both environments together (hillside and valley) was 0.714±0.218 liters. From all individuals with DBH over 30 cm, 38 (58%) produced some amount of oleoresin, averaging 1.113±0.562 liters in the hillside, 1.329±0.448 liters in the valley and 1.190±0.355 liters in both environments together. The results show the need for planning the use of the surroundings of the study area in order to reach the required volume of copaiba to make feasible the sustainable management of oleoresin extraction in the region.Keywords: Biometrics; Copaiba Oleoresin; Natural population. ESTRUTURA POPULACIONAL E PRODUÇÃO DE ÓLEO-RESINA DE COPAÍBA ENTRE VALES E ENCOSTAS DE ÁREA DE MINERAÇÃO NO RIO TROMBETAS-PARÁRESUMO -O objetivo deste trabalho foi estudar as populações naturais de copaíba (Copaifera multijuga Hayne) na serra Monte Branco, em Porto Trombetas-PA, para subsidiar o manejo sustentável e a exploração de óleo-resina da espécie. Foi estudada a estrutura populacional da copaíba nas encostas e vales remanescentes da face Sul da serra Monte Branco, dentro da Floresta Nacional Saracá-Taquera, onde fora extraído o minério bauxita das áreas de platô no biênio de 2013-2014 pela Mineração Rio do Norte (MRN). Foi feito o inventário florestal a 100% da espécie e a extração do óleo-resina para quantificar o potencial produtivo das áreas remanescentes. A densidade de indivíduos de copaíba com DAP > 30 cm, na encosta, foi de 0,33 indivíduo por hectare, no vale foi de 0,25 indivíduo por hectare, e nos dois ambientes a densidade foi de 0,28 indivíduo por hectare. A média de produtividade de óleo-resina de copaíba na encosta foi de 0,661±0,334 litro e no vale, de 0,765±0,280 litro. A 52Revista Árvore, Viçosa-MG, v.40, n.1, p.51-60, 2016 GEBARA, J. et al.
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