Comparação de equações volumétricas ajustadas com dados de cubagem e análise de tronco.

Ciencia Florestal (Impact Factor: 0.22). 01/2010; 16(3). DOI: 10.5902/198050981911
Source: OAI


This work aimed at comparing volume estimates with bark, obtained with equations originated from data of the stem measurements with bark and stem analysis without bark, respectively. The base of information for the development of this study was obtained in forest of Pinus taeda L. in the municipal district of Ponte Alta do Norte, Santa Catarina, being composed by two hundred and forty trees measured with bark in different ages, which were selected aleatorily and distributed by diameter class. Another source of data was obtained with the stem analysis without bark of thirty sample trees, distributed among averages and dominant. Mathematical models were tested for each source of data, in order to select the one of better adjustment and precision, with base in the selection criterion of the Score Pondered Value of the Statistical Parameters (VP). The result of VP revealed the equation of Schumacher-Hall as the most appropriated one in the estimate of the volume for the respective sources of data. The comparison between the estimates of volume of the adjusted models starting from data of the stem measurements with bark and of the stem analysis without bark was accomplished with the test Qui-square, which demonstrated that there area no significant differences to be significant difference among the them allowing to affirm that it is possible to obtain the volume with bark starting from an equation generated with volume data without bark, obtained through the stem analysis.

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Available from: César Augusto Guimarães Finger, May 19, 2015
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    • "resultados do coeficiente de determinação de modelos volumétricos para plantações florestais encontrados em outros trabalhos quase sempre se situam próximos de 0 , 9 , como em Santana et al . ( 2005 ) , no qual foi testado o modelo de Schumacher - Hall com algumas transformações para um plantio de Eucalyptus grandis no estado de São Paulo , e o de Thomas et al . ( 2006 ) , que compararam nove equações de volume , entre elas a de Schumacher – Hall , para um plantio de Pinus taeda L . no estado de Santa Catarina . Das seis equações testadas , a que apresentou melhor ajuste , tanto para o volume com casca como para o sem casca , foi a equação de Schumacher - Hall ( Modelo 6 ) , apresentando maior coefici"
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    ABSTRACT: The use of simplified tools that allow obtaining precise values of wood volume is essential in forest planning Thus, the objective of this study was to select volumetric and hypsometric equations for a stand of Eucalyptus sp. with an area of approximately 16 ha, located at Ibura National Forest, Nossa Senhora do Socorro, Sergipe, Brazil. For this purpose, a census of the eucalypt stands was carried out, measuring the circumference at breast height of all trees. The data were grouped in diameter classes with 5 cm width and 36 trees were selected to perform volume calculations. From the pairs of actual data of height and diameter, obtained by the volume calculation method, it was possible to fit the hypsometric and volumetric models. The model that presented the best height-diameter ratio was the simple linear model. For the volume with and without bark, the model of Schumacher-Hall showed best results. The residual graphical analysis showed a homogeneous and uniformdistribution of points on both sides of origin line, showing a satisfactory correspondence between actual and estimated data.
    Full-text · Article · Mar 2011 · Revista Brasileirade Ciencias Agrarias