Potencial energético de clones de Eucalyptus urophylla x Eucalyptus grandis na Região Norte de Mato Grosso

Abstract

The energetic forests of Eucalyptus gender are a great source of raw material for the production of energy by using firewood or for the production of charcoal, with tremendous environmental advantages, since it is a of renewable energy source. Being this source of energy of utmost importance, the present study has aimed to evaluate the energetic potential of clones of Eucalyptus urophylla x Eucalyptus grandis at their 48 month old in the city of Sinop, in the north of the State of Mato Grosso, targeting to identify clones which are recommended for energetic forests. The study was carried out in an experimental randomized complete block designs, with the evaluation of seven clones in four repetitions, containing 49 trees per plot, spacing 3,6 m x 2,5 m. Was measured the height and the DBH (diameter at breast height at 1,3 m high) and one tree harvested with average DBH per plot, totaling 28, disks of the 5 cm thick were removed from each harvested tree at the height ratio of DBH, 0, 25, 50, 70 and 100% of commercial height, divided into four equal parts wedged shaped to carry out the procedures in the laboratory. We have verified high productivity, with annual average value for the medial increment of 68,08 m³.ha- ¹.year- ¹, from 31,37 t.ha- ¹.year- ¹ to dry mass, 4587,98 Kcal.kg- ¹ to superior calorific power, 602,75 GJ.ha- ¹.year- ¹ for the energy production, with no relevant difference among the clones. A statistic difference for the lignin was verified with average value of 26,40%, for extractive 6,90%, holocellulose 66,70%, energetic density 2,11 Gcal.m -3 and basic specific mass 460,92 Kg.m-3 . All the seven genetic materials can be used for the energetic forest implementation, aiming the production of firewood, once it presents a high productivity and elevated energetic production, furthermore, with a higher content of lignin, clone F1C219 has highlighted.