Métodos para obtenção da altura e do volume total de árvores em sistema de integração lavoura-pecuária-floresta

Abstract

The objective of this work was to evaluate the accuracy of methods for obtaining height and total and partial volume with eucalyptus bark in a crop-livestock-forest integration system (ILPF). The following instruments were tested for height: Vertex IV®, Haglöf® Hypometer / Clinometer, Criterion RD 1000®, Smartphone Measure Height application and Christen's Hypsometer. The efficiency of Criterion RD 1000® (non-destructive method) was tested for total and partial volume shells. Then the same trees measured by the hypsometers and the Criterion were felled (20 trees), and made the rigorous cubage, with trena and suta. We performed mean, Dunnett and t tests for independent samples at 95% probability, for height and volume respectively. Waste analysis and complementary tests were also carried out. There was a difference in the actual height only with the one obtained by the smartphone application. The Criterion RD 1000 obtained best estimate, followed by Vertex and Haglöf respectively, and Christen's hypsometer was more biased. There was statistical equality between the total and partial volumes obtained by the destructive method compared to the non-destructive method, as well as there was equality for the diameters obtained along the shaft. The measurements obtained with the Criterion RD 1000® were presented without tendencies, providing efficient estimates for height and total volume as well as partial in the sections with the highest volumetric concentration, being indicated for such purposes, and consequently for the development of multiproduct equations .