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    TREE SPECIES COMMUNITY SPATIAL PARTITION IN FUNCTION OF SOIL DRAINAGE IN AN ARAUCARIA FOREST FRAGMENT IN SOUTHERN BRAZIL

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    O estudo das rela\ue7\uf5es entre a vegeta\ue7\ue3o e os solos pode auxiliar na compreens\ue3o da estrutura de uma comunidade florestal, dando suporte \ue0 conserva\ue7\ue3o da biodiversidade. Assim, o presente estudo teve como objetivo avaliar a exist\ueancia da parti\ue7\ue3o espacial da comunidade de esp\ue9cies arb\uf3reas em um fragmento de Floresta com Arauc\ue1ria, em fun\ue7\ue3o da drenagem do solo. Para este prop\uf3sito, foi realizada a caracteriza\ue7\ue3o ambiental (drenagem do solo, propriedades f\uedsicas e qu\uedmicas do solo, topografia, compacta\ue7\ue3o dos solos, profundidade dos solos e cobertura do dossel) em 25 parcelas de 20x20 m, onde indiv\uedduos de esp\ue9cies arb\uf3reas, com circunfer\ueancia a altura do peito (CAP) maior ou igual a 15,7 cm, foram previamente contados, medidos e identificados. Os dados foram analisados por meio do teste de Mann-Withney, an\ue1lise de vari\ue2ncia multivariada n\ue3o param\ue9trica (NPMANOVA), an\ue1lise multivariada (NMDS) e an\ue1lise de esp\ue9cies indicadoras. Os locais foram classificados como bem e moderadamente drenados, com diferen\ue7as ambientais que determinaram a riqueza, a parti\ue7\ue3o espacial da comunidade e a ocorr\ueancia de esp\ue9cies indicadoras na pequena escala espacial considerada. Desta forma, conclui-se que, no fragmento florestal estudado, as varia\ue7\uf5es espaciais na drenagem do solo foram determinantes na heterogeneidade da composi\ue7\ue3o flor\uedsticaestrutural observada.The relationship vegetation-soil can contribute to understand the forest structure, supporting biodiversity conservation. Thus, the aim of the present study was to verify the existence of spatial partition of the tree species community in an Araucaria forest fragment in function of soil drainage. For this sake, an environmental characterization (soil drainage, physical and chemical soil properties, topography, compression with circumference at breast height 6515.7 cm were previously counted, measured and identified. The data were analysed by Mann-Withney test, non-parametric multivariate ANOVA (NPMANOVA), multivariate analysis (NMDS) and indicator species analysis. In this small spatial scale there were two drainage classes, corresponding to well and moderately-drained soils, with environmental differences that determined the richness, the spatial partition of the tree community and the occurrence of indicator species. Thus, we conclude that in the study forest fragment soil drainage spatial variations were determinant in the floristicstructural heterogeneity observed in tree community
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