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In order to prove the validity of the dominance expression as a function of basal area, according to Cain et al. (1956), six mathematical models were tested. The models tested were: Dcp = a + b (d1,3) + c (1/ d1,3); Dcp = a + b (d1,3) + c (d1,3)2; Dcp = a + b (d1,3); Dcp = a + b (1/ d1,3); Dcp = a + b (d1,3)2; and Dcp = a + b(log d1,3); which: Dcp = crown diameter; d1,3 = diameter at 1,30 m from the soil, ou diameter at breast height (DBH) e a.b.c = coefficients of the regression equation. Proven DCP / d1, 3 relation, it was calculated the basal area (G), which is the sum of the cross-section (g) of each tree bole of a species, expressed per unit area, in this case hectare. There is a strong correlation between crown diameter (DcP) and diameter at breast height (DBH) in the studied forest. Among five models tested, only two, DcP = a + b (1/ d1,3) e Dcp = a + b (Iog d1,3), not exhibit good degree of adjustment, should not be used in this type of forest. The values of r2 above 0,70 show that is possible use DBH and therefore the basal area to express the dominance, mainly considering the relation crown diameter /DBH is very specific. Keyword: Mathematical Models, Diametric Structure, Tropical Ecosystem. ADERÊNCIA DE MODELOS PARA ANÁLISE DA ESTRUTURA DIAMÉTRICA DE ECOSSISTEMA TROPICAL Resumo: Para comprovar a validade da expressão da dominância em função da área basal, conforme sugerido por Cain et al. (1956), foram testados seis modelos matemáticos. Os modelos testados foram os seguintes: Dcp = a + b (d1,3) + c (1/ d1,3); Dcp = a + b (d1,3) + c (d1,3) 2 ; Dcp = a + b (d1,3); Dcp = a + b (1/ d1,3); Dcp = a + b (d1,3) 2 ; e Dcp = a + b(log d1,3); onde: Dcp = diâmetro da copa; d1,3 = diâmetro a 1,30 m do solo, ou diâmetro à altura do peito (DAP); e a.b.c = coeficientes da equação de regressão. Comprovada a relação Dcp / d1,3, calculou-se a área basal (G), que é a somatória das secções transversais (g) dos fustes de cada árvore de uma espécie, expressa por unidade de área, neste caso o hectare.

ADHESION MODELS FOR ANALYSIS OF THE TROPICAL ECOSYSTEM DIAMETRIC STRUCTURE