Avaliação de diferentes amostragens na estimativa do volume de Eucalyptus urograndis cultivado em sistemas de integração lavoura pecuária-floresta

Abstract

The tree component in crop-livestock-forest integration systems is a major reason the accession of these systems, because of the high financial profitability and its environmental importance. Because of this, it is necessary to know the dendrometric evaluation of this component. The study aimed to evaluate different samples to determine the volume of Eucalyptus urograndis, grown in iLPF in double and triple spatial arrangement. Evaluated the fixed area method with rectangular plots and Prodan method with circular plots, with sampling units containing 6, 8, 16, 32 and 64 trees and 6, 9, 18, 36 and 72 trees in the triple spatial arrangement for the simple and systematic random sampling process. The first step in choosing the best sampling, was the elimination of sample units that did not include the volumetric average per hectare obtained in the census in their respective confidence intervals for the total. Subsequently we compared the samples considered the estimated volume hectare, the coefficient of variation (CV%) and the sampling error (EA%). The results showed that the circular plots with 6 trees and rectangular plots with 9 trees, both units systematically distributed, best represent tree growth in the double spatial arrangement and triple respectively.