TCC - Engenharia Florestal (Sede)
URI permanente para esta coleçãohttps://arandu.ufrpe.br/handle/123456789/436
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Resultados da Pesquisa
Item Caracterização energética da maravalha gerada no processamento mecânico da madeira em marcenarias de pequeno porte(2023-09-21) Campelo, Irlan Paulo Ferreira; Braz, Rafael Leite; http://lattes.cnpq.br/7332493832361305; http://lattes.cnpq.br/1038816224446032In Brazil, electricity consumption has grown increasingly, the search for other energy sources must be discussed and worked on, especially in some regions of the country. Brazil's energy crisis is marked by political, economic and environmental factors, which are directly related to the country's difficulty in maintaining its energy supply. Given this context, several sectors have sought new energy alternatives in order to meet the required demand, investing increasingly in sustainable alternatives. Thus, the objective of the work was to evaluate the energy potential of wood shavings generated in the mechanical processing of wood in small carpentry workshops through its energetic properties. The material used was maçaranduba and sucupira wood shavings, collected in two carpentry workshops in the municipality of Camaragibe - PE. The analyzes carried out were: moisture content, bulk density, content of volatile materials, ash, fixed carbon, higher, lower and useful calorific value, extractive content, lignin and holocellulose content. The results of the chemical and calorimetric analyzes of the wood shavings, although they indicate that Treatment T1 had a slight advantage over Treatment T2, these differences are minimal and can be attributed to natural variations in the properties of the wood shavings. Therefore, the wood shavings materials analyzed have promising energetic properties. Its high energy density, low moisture content and favorable chemical composition indicate that wood shavings can be an excellent option as an energy source. This discovery suggests that wood shavings can serve as an efficient and sustainable alternative in replacing non-renewable energy matrices, thus contributing to the diversification and improvement of the energy supply, meaning that waste/disposal can be reused and used directly for generating energy or obtaining briquettes, pellets.Item Estimativa de biomassa em povoamento clonal de Eucalyptus sob o manejo de talhadia aos 36 meses de idade(2023-04-24) Silva, Jonatas Carlos da; Berger, Rute; Hakamada, Rodrigo Eiji; http://lattes.cnpq.br/4186459700983170; http://lattes.cnpq.br/5395827385005105; http://lattes.cnpq.br/0314188517416061Studies on the quantification of individual stem biomass are fundamental to determining the productivity of planted forests, facilitating forest management and planning activities, especially in coppice systems, which can reduce costs by up to 60% compared to high forest management. The aim of this study is to establish the best statistical models for estimating aboveground and wood biomass production, as well as questioning the use of general equations and previous rotation for Eucalyptus clones. The research was carried out in Mogi Guaçu-SP. Biomass was collected from the destructive analysis of clones, with 0.3 kg of leaves collected from each third of the canopy and branches, and discs removed at DBH (0%, 25%, 50%, 75%, and 100% with a diameter of 5 cm) of the stem, based on the total height of the tree. In the field, all aboveground compartments were weighed separately to obtain the total wet weight, while in the laboratory, each compartment was dried in a forced ventilation oven at 65°C to obtain the dry weight. Through regression analysis, adjusted equations were obtained, using total biomass and wood biomass (Bi) as the dependent variable and DBH and total height (H) of the trees as the independent variables. The Schumacher-Hall model showed the best fit for all clones, with the highest adjusted R² and the smallest standard errors of estimate. Based on this model, a general equation for wood biomass of clones on the site was adjusted, however, individual equations for each clone showed higher precision in individual biomass estimates. The adjusted equation in the first rotation of the stand overestimated the individual biomass of three clones by 22% and showed greater dispersion in clones with lower survival. Based on the results obtained, individual biomass estimation equations should be adjusted taking into account the silvicultural system and genotypes.Item Comparação de modelos estocásticos nas estimativas volumétricas e de biomassa em Eucalyptus spp. da Chapada do Araripe - PE(2022-05-31) Silva, Aline Amorim da; Silva, José Antônio Aleixo da; http://lattes.cnpq.br/5674098794412714; http://lattes.cnpq.br/7046975217725378The objective of this work was to compare and evaluate stochastic models in volumetric and biomass estimates in Eucalyptus spp. with 5.5 years of age and in its second rotation, in Chapada do Araripe - PE. The study was carried out from data on volume and the total biomass of the tree compartments (stem, bark, branch and leaf), collected in experimental plantations of Eucalyptus spp. at the Experimental Station of the Pernambuco Agronomic Institute – IPA – in Araripina-PE, where 150 individuals were randomly sampled for cubage and modeling. Adjustments were made to nine volumetric models, using the SYSTAT (12.0) software. The Stepwise (backward method) was applied to the models and the following criteria were established to select the best equation: significance of the regression coefficients (bi), standard error of the estimate (Sxy), Akaike Information Criterion (AIC), Corrected Fit Index (AIc), graphical analysis of residuals and the weighted value of the statistical scores (VP). Based on the results obtained, it was observed significancy at the level of 1% of probability, for all the coefficients of the equations. However, it was observed that, when using the regression analysis by Stepwise (backward method), some volumetric and biomass models underwent important modifications within their format, resulting in the suppression of independent variables and equality among some equations. After applying the analysis techniques, it was observed that all the proposed models showed a good precision between the volumetric and total biomass estimates, as a function of the DBH and height of the tree individuals. For the volumetric models the Naslund, Naslund (Modified), Schumacher and Hall, Meyer, Meyer (Modified), Prodan and Stoate showed the best fit and precision among the evaluated models, while for the total biomass, the Prodan, Schumacher e Hall, Naslund (Modified), Meyer, Stoate, Spurr (Combined Variable), Naslund e Meyer (Modified) models showed the best fit, being, therefore, the most viable models for future forest inventories in Eucalyptus spp. in Chapada do Araripe.