Ajuste e validação de equações hipsométricas para Pinus elliottii var. elliottii na floresta de Inhamacari

Abstract

The present work was developed with the purpose of determining the best hypsometric equation for height estimation for Pinus elliottii species, in the forest of Inhamacari, District of Manica, Province of Manica in an extension of approximately 6 km, to the south by the village of Posto Administrativo of Machipanda. The data were collected in the 28-year-old Pinus elliottii stand, with sampled trees that grew in stands managed to produce sawn wood. The cubing of the 45 trees was done by the Hohenadl relative method, taking the relative measurements of the diameters at 0%, 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85 %, 95% and 100% of the total height of the shaft, not considering the height of the stump. To define the total height of each shaft, the minimum diameter of the top was 10 cm. With these data, different equationshipsometric equations were developed, and the best ones were selected using the value of F, adjusted coefficient of determination (R2aj (%)), standard deviation of the estimate in percentage (Syx (%)), furnival index in percentage ( IF (%)), mean residual test, graphical analysis of residues and for validation, the graphical method and the chi-square test (X2) were used. Of the hypsometric equations, the one that best fitted the equation was, √ = b0 + b1 * DAP + b2, with the value of the coefficient of determination (R2aj (%) = 78,148), standard deviation of residues (Sxy (%) = 9,252 ), F value (F = 79.677), and mean residual value (RM = -2.96x10-16), and calculated t-value less than the critical t-value. (TRADUÇÃO NOSSA)