O emprego da geoestatística na determinação do tamanho "ótimo" de amostras aleatórias com vistas à obtenção de estimativas dos volumes dos fustes de espécies florestais em Paragominas, estado do Pará

Abstract

The objective of this study was to determine the appropriate size sample to estimate the stem volumes stems of tree species from a population of trees to be cut in the forest management system of the timber company Cikel Brasil Verde Madeiras – Pará State, Brazil. The methodologies of systematic sampling and geostatistical kriging with sequential simulation were used, respectively, for the choice of samples and estimation of stem volumes of trees. The results showed that the methods can be used to calculate the stem volumes of trees. However, the kriging method has a smoothing effect, which resulted in an underestimation of the volumes. In such case, a correction factor was applied to minimize the effect of smoothing. The sequential simulation indicative presented more accurate results compared to kriging, since this method has certain advantages over kriging, such as not requiring samples with normal distributions and no smoothing effect characteristic of the interpolation methods.