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In the Gypsum Pole of Araripe, semiarid zone of Pernambuco, where\udis produces 97% of the plaster consumed in Brazil, a forest experiment with 1875\udeucalyptus was cut off and all the trees were rigorously cubed by the Smalian method.\udThe location of each tree was marked on a Cartesian plane, and a sample of 200 trees\udwas removed by entirely random process. In the 200 sample trees, three estimation\udmethods for variable volume timber, regression analysis, kriging and cokriging were\udused. To cokriging method, the secondary variable was the DBH (Diameter at Breast\udHeight), and for the regression model of Spurr or the combined variable, it uses\udtwo explanatory variables: total height of the tree (H) and the DBH. The variables\udvolume and DBH showed spatial dependency. To compare de methods it was used\udthe coefficient of determination (R2) and the residual distribution of the errors (real\udx estimated data). The best results were achieved with the Spurr equation R2 =\ud0.82 and total volume estimated 166.25 m3. The cokriging provided and R2 = 0.72\udwith total volume estimated of 164.14 m3 and kriging had R2 = 0.32 and the total\udvolume estimated of 163.21 m3. The real volume of the experiment was 166.14 m3.\udKey words: Forest inventory, Volume of timber, Geostatistics

ESTIMAÇÃO DE VOLUME DE MADEIRA DE EUCALIPTO POR COKRIGAGEM, KRIGAGEM E REGRESSÃO