Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/50010
Title: Sistemas de equações utilizados na construção de diagramas de manejo da densidade de povoamentos de teca
Other Titles: Equation systems used in the construction of density management diagram of teak stocks
Keywords: Equações simultâneas
Precisão estatística
Manejo florestal
Simultaneous equations
Statistical precision
Florestal management
Issue Date: Apr-2021
Publisher: Universidade Federal de Santa Maria
Citation: MADI, J. P. S. et al. Sistemas de equações utilizados na construção de diagramas de manejo da densidade de povoamentos de teca. Ciência Florestal, Santa Maria, v. 31, n. 2, p. 935-947, abr./jun. 2021. DOI: 10.5902/1980509844176 .
Abstract: The aim objective of study was to evaluate the system of equations used at the construction of density management diagrams. The data was collected at clonal stands of teak in the southern-central region of Mato Grosso state, Brazil. The ages of the stand varied between one and eight years, where the measures were taken in circular plots. The plots had areas varying from 359 to 616 m2. The diameter at breast height and total height were measured from the trees that composed the plots. The volume was calculated in 827 trees by the Smalian’s method. Two systems of equation were used to carry this study out and the evaluation of the fit was made by the statistics: root mean square error (RMSE); percentage of root mean square error (RMSE (%)); coefficient of determination (R2) represented by the squared correlation coefficient (r²xy); residuals in the percentage scale (residual (%)); and graphical analysis of the parameter fittings. The system of equation that obtain the best results was the proposed by Dean and Baldwin, with the statistic R2 between 0,9942 - 0,9994, and RMSE (%) 2,88 - 1,84, regarding the other system that presented 0,9558 - 0,9539 and 13,94 -7,99 to the statistics R2 and RMSE (%), respectively. The distribution of residues from the Dean and Baldwin system were also superior, corroborating the results of the statistical analyzes. The results of this work allow us to infer that the system of equations proposed by Dean and Baldwin is more accurate, and, therefore, the one indicated in the development of population density management diagrams in clonal teak stands.
URI: http://repositorio.ufla.br/jspui/handle/1/50010
Appears in Collections:DCF - Artigos publicados em periódicos



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