Avaliação de uma metodologia para otimização de volume de toras comerciais de Eucalyptus sp. em função da qualidade do fuste / Evaluation of a methodology for volume optimization of Eucalyptus sp. merchantable logs as a function of stem quality

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

This work had as general objective the evaluation of a methodology for estimate of the wood volume in the forest inventory, considering the profile of quality of the stem of the trees. A stand was used with area of 4,31 ha planted with Eucalyptus sp. with 16 year-old, originated from seminific propagation. The initial spacing used in the planting was 3 x 3 m and a selective thinning was done with 8,6 years. Firstly, it was evaluated four taper models to estimate the stem taper: Demaerschalk, Ormerod, Schöepfer and Hradetzky. These models were tested to estimate the volume and the height for the commercial diameters of 7 and 28 cm. It was used 32 tree-samples in equations fitting and 27 tree-samples for the validation tests. Based on the graphic analysis of the residuals, in the statistics (correlation coefficient, relative standard error, "bias" (B), in the average of the differences (MD) and standard deviation of the differences (DPD)) and in Leite and Oliveira (2002) test, it was verified that the model of Ormerod was what presented better volume estimate and the model of Schöepfer obtained better height results. The second part was dedicated in evaluating an inventory methodology to estimate the wood production for sawmill in relation to quality classes and assortment. Eight circular samples of 855 m were located. In those samples were measured the diameter at 1,30 m (DAP) and total height (Ht) of the trees, and the stems with DAP larger than 28 cm were classified in agreement with a priori defined quality classes. The stems of the trees from 8 samples were submitted to the optimization process. After the crop xvi of all trees, the stems were marked by a trained team and they were sawed for subsequent comparison to the commercial volumes of the logs drawn with the volume obtained by the optimization method. The volume and the number of logs for quality classes and assortment, optimized and explored, have significantly difference by qui-square test, with 5% of probability. It was concluded that there is necessity of standardization of the exploration and inventory team training and the inventory methodology presented need to be improved before implementation.

ASSUNTO(S)

recursos florestais e engenharia florestal wood quality optimization systems inventário florestal dendrometria comercial qualidade da madeira commercial forest biometric sistemas de otimização

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