-(Spatial distribution pattern and size structure of tree species and its structuring factors in a fragment of the Brazilian cerrado). The aim of this study was to analyze population structure and spatial distribution pattern of five tree species in a fragment of cerrado stricto sensu in the southwest of the Goiás State, Brazil. Fifty quadrats of 10 × 10 m (100 m 2 ) were surveyed, and all individuals within each quadrat were sampled. The theoric distributions of Poisson and Negative Binomial and two indices of dispersion, the variance to mean ratio (I) and the Green's coefficient (I g ), were used to detect the spatial pattern of the populations. The population structure was verified by the frequencies distribution of six size classes. An aggregated spatial pattern was detected for all species, with smaller individuals segregated spatially from bigger individuals, except for Qualea grandiflora Mart., and also the distribution of size classes in "reverse J-shaped", but with many particularities. This suggests differences in the structural pattern of the populations investigated and, consequently, in its dynamics and structuring processes.
RESUMO. O objetivo do presente trabalho é identificar e descrever o padrão de distribuição espacial de Hymenaea courbaril L. (Fabaceae) e os fatores condicionantes em um fragmento florestal, denominado Mata do Açude, município de Jataí Estado de Goiás. O procedimento adotado para coleta dos dados espaciais foi o método da distância conhecido como T -Square, utilizado para duas classes de tamanho: jovens e adultos, com circunferência de caule inferior e superior a 15 cm, respectivamente. Os fatores condicionantes analisados foram o padrão espacial de deposição das sementes e as características do substrato (solo e serrapilheira). A estrutura espacial da população foi identificada pelo teste de Hines (h t ), a qual apresentou distribuição agregada, tanto para indivíduos adultos (h t = 1,47, p < 0,005) quanto juvenis (h t = 1,88, p < 0,005) e um maior número de sementes em torno de 4 m da planta-mãe. As condições edáficas não se diferenciaram entre os pontos amostrados, ao contrário da serrapilheira que apresentou diferenças significativas para umidade relativa e matéria seca. Os dados sugerem que o recrutamento e, consequentemente, a distribuição espacial dos jatobás na Mata do Açude é fortemente estruturada pelo padrão de deposição das sementes e pelas características do substrato, principalmente aquelas atribuídas à serrapilheira.Palavras chave: método T -square, mata de galeria, distribuição agregada, recrutamento.ABSTRACT. Spatial structure and seed deposition of Hymenaea courbaril L. in a forestal fragment in the southeast of the Goiás State. The objective of this study was to identify and describe the pattern of spatial distribution of Hymenaea courbaril L. (Fabaceae) and its structuring factors in the Mata do Açude forest fragment in Jataí Municipality, Goiás state. We used two individual size classes: juveniles and adult, with stalk circumference smaller and bigger than 15 cm, respectively. The population spatial data were sampled by the 'T-Square' distance method and the structuring factors analyzed were the spatial deposition pattern of seeds and substrate conditions (soil and litter). The Hines statistical test (h t ) was used to detect the population spatial pattern. The tree population presented aggregated spatial structure, for both adults (h t = 1.47, p < 0.005) and juveniles (h t = 1.88, p < 0.005), with greater seed density at four meters from the plant. The soil conditions were not different among sampled points. On the other hand, the litter conditions presented significant differences for moisture and dried organic matter. These data suggested that the recruitment and spatial distribution of H. courbaril in the Mata do Açude is strongly structured by the seed deposition pattern and litter conditions.
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