PHYTOGEOGRAPHIC ANALYSIS OF SHRUB AND TREE FLORA IN AN ECOTONAL AREA IN THE BODOQUENA PLATEAU, MS, BRAZIL/ANALISE FITOGEOGRAFICA DA FLORA ARBUSTIVO-ARBOREA EM ECOTONO NO PLANALTO DA BODOQUENA, MS, BRASIL

Setting priorities in the conservation of terrestrial ecosystems refers to the need for knowledge about the diversity of environments, especially in the Cerrado biome and its floristic transition zones, already in high stage of degradation. With this scenario, this study aimed to carry out a floristic inventory of a forest fragment on ecological tension in Bodoquena Plateau, MS, Brazil, and assess their phytogeographical relationships with other surveys of seasonal forests and savannas in the Midwest and Southeast regions of Brazil. For this, 102 contiguous plots of 10x10 m (100 [m.sup.2]) were sampled. The inclusion criterion was the perimeter at breast height (PBH) [greater than or equal to] 15 cm. For floristic similarity analysis, the coefficient of Sorensen was applied, adopting the unweighted pair group method with arithmetic mean (UPGMA), with the determination of the level of similarity of 26 floristic lists. Of the 96 species occurring in this survey, 91 were identified at species level, and of these, 80.2% (73) were found in one or more studies of the analyzed areas with higher occurrence in seasonal deciduous forest (SDF) (54), followed by seasonal semideciduous forest (SSF) (47) and forested savannah (46). The results showed clustering of the study area with the FED of Minas Gerais in level of 30%, revealing low similarity. Due to low floristic similarity between the analyzed areas, these are characterized by their high beta diversity. Keywords: cerrado; seasonal forest; floristic transition; similarity. O estabelecimento de prioridades na conservacao dos ecossistemas terrestres remete a necessidade de conhecimento acerca da diversidade destes ambientes, especialmente no bioma Cerrado e suas zonas de transicao floristica, ja que se encontram em elevado estagio de degradacao. Com este cenario, este estudo objetivou realizar o inventario floristico de um fragmento florestal sobre area de tensao ecologica no Planalto da Bodoquena, MS, Brasil, e avaliar suas relacOes fitogeograficas com outras florestas estacionais e cerrados do Centro-Oeste e Sudeste do Brasil. Foram amostradas 102 parcelas contiguas de 10 x 10 m (100 [m.sup.2]). O criterio de inclusao foi o perimetro a altura do peito (PAP) [greater than or equal to] 15 cm. Na analise de similaridade floristica foi aplicado o coeficiente de Sorensen, adotando-se o metodo de ligacao pela media de grupo (UPGMA), em que se calculou o grau de similaridade de 26 listas floristicas. Das 96 especies oco