Evaluation of the spatial dependence of dendrometric characteristics for an Eucalyptus plantation
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Universidade Estadual de Maringá
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Geostatistics evaluates the spatial dependence between two or more variables in order to estimate unknown values in space. The objective of this study was to evaluate, using geostatistical techniques, the spatial variability of dendrometric characteristics for a commercial plantation of Eucalyptus grandis x Eucalyptus urophylla located in eastern Minas Gerais, Braz il (19º28’ S and 42º49’ W). The diameter at breast height (DBH) and commercial height (H) of 60 trees was measured in a forest inventory plot at two, five and seven years old. The volume of each tr ee in the plot was estimated from allometric equations and values of DBH and H. Spatial dependence of the three dendrometric variables at different ages was evaluated by fitting the experiment al semivariogram. Validation of the semi variograms was performed using the jackknife test. The dendrometric variables analyzed presented normal distribution throughout the entire production cycle according to the Kolmo gorov-Smirnov test. The spherical model adequately represented the spatial distribution of dendrome tric characteristics for the planted forest. The dendrometric characteristics of the analyzed plantati on had an average spatial dependence, making the use of geostatistical techniques for characteri zation of the plantation very important.
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