Floristic and structural comparisons and a numerical classification were performed to identify the priority areas for conservation of genetic resources in central Brazil. The main type of woody vegetation, cerrado sensu stricto (savanna woodland with 10–60% tree cover), was sampled under a uniform methodology in six selected sites (total sample of 6 ha) scattered in a physiographic unit called the Pratinha Plateau located between 15–20° S and 46–49° W. A total of 6971 trees belonging to 139 species and 42 families was measured. Each site had a combination of 50–80 species and approximately 30 families but only 22 species from 14 families were common to all sites. Similarity decreased with distance, indicating the existence of geographical gradients as the physical characteristics were relatively uniform and the soils were dystrophic at all sites. The most dissimilar sites, in the localities of Patrocínio-MG and Paracatu-MG were recommended for the establishment of conservation units. The already existent conservation units arc all clumped in the Federal District and are not enough to protect the genetic heritage of the plateau. Floristics and phytosociological surveys based on land system zoning were recommended as useful tools in planning conservation areas at a regional level to preserve the maximum biodiversity.
RESUMO: Foram selecionadas seis áreas de estudo, Estação Ecológica de Águas Emendadas-DF, Parque Nacional de Brasília-DF, APA Gama-Cabeça do Veado-DF, Silvânia-GO, Paracatu-MG e Pat rocínio-MG na Chapada Pratinha (15-20'" S e 46-49~ W), três delas em unidades de conservação e três fora delas. Em cada área foram amostradas 10 parcelas de 1000 m 2 (20xSOm). Todas as árvores a partir de 5 cm de diâmetro na base do tronco foram medidas e identificadas. A florística ea fitossociologia de cada área foi analisada e estas foram comparadas entre si pelos índices de similaridade de S0rense e de Morisita. No total foram encontradas 139 espécies e 42 famílias sendo que ape nas 22 espécies foram comuns a todas as áreas. Leguminosae e Vochysiaceae apresentaram valores de im!XIrtância elevados em todas as áreas. As densidades !XIr ha variaram de 664 a 1396. Os índices de diversidade de Shannon variaram de 3,1 1 a 3.56. As similaridades foram altas pelo índices de Sorensen, de 0,5 a 0,7, !XIrém baixas pelo de Morisita quando se comparou as áreas de Paracatu e Patrocínio com as demais áreas. Foi concluído que as diferenças florísticas e principalmente estruturais foram elevadas entre estas duas áreas que são mais distantes e se situam a menores altitudes do que aquelas si tuadas nas unidades de conservação existentes na chapada sendo sugerida a criação de novas unidades nestes Municípios.
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