Effects of Canopy Gaps, Topography, and Soils on the Distribution of Woody Species in a Central Brazilian Deciduous Dry Forest1

摘要: The interrelationships between the distribution of woody species and environmental variables were investigated in an area deciduous dry forest Santa Vitoria, central Brazil. This is first study a vanishing type which grows on base-rich soils originating from basalt bedrocks southern Goias western Minas Gerais. A survey topography, soil properties, canopy gaps plants (≥5 cm diameter at base stem) was conducted 50–15 × 15 m quadrats. classified into following series: Hapludolls Haplustolls Ustropepts Rhodustalfs. series corresponded to gradient increasing elevation effective depth decreasing slope gradient, organic matter total exchangeable bases. canonical correspondence analysis detrended indicated that plant species’abundance significantly correlated with both relative quadrats soil-topography gradient. Presumably, critical factors involved these two gradients are, respectively, light ground water regimes. influence (i.e., light) surprising has not been documented previously for tropical forests. RESUMO As interrelacoes entre distribuicao de especies lenhosas e variaveis ambientais foram investigadas em uma floresta seca decidua Este o primeiro estudo sobre as florestas deciduas que crescem os solos ricos nutrientes derivados dos derrames basalticos do sul Triângulo Mineiro quase erradicadas da regiao. Foi realizado um levantamento topografia, propriedades solos, clareiras plantas diametro na tronco) 50 parcelas m. Os classificados serie Rhodustalfs, qual corresponde gradiente crescente elevacao topografica decrescente profundidade efetiva solo, declividade terreno, materia orgânica solo soma bases trocaveis. Uma analise correspondencia canonica retificada indicaram abundância das correlacionou-se significativamente com relativa nas topografia. Presumivelmente, fatores criticos envolvidos nestes dois gradientes foram, respectivamente, luz regime agua no solo. influencia (ou seja, luz) foi surpreendente nao tinha sido documentada anteriormente para secas.