Composição florística e estrutura da vegetação arbustivo-arbórea em um cerrado rupestre, Cocalzinho de Goiás, Goiás

Abstract

A vegetation survey of the woody species (at least 5 cm of trunk diameter at 30 cm above the ground) was conducted in a savanna on rocky soil (cerrado rupestre) in Cocalzinho de Goiás municipality, Goiás State, Brazil (15°48' S and 48°45' W). The objective was to compare the structure characteristics and the floristics of cerrado rupestre with those features found in cerrado stricto sensu areas occuring on deep soils in Central Brazil. The sample consisted in 1.0 hectare (ten plots, 20 × 50 m) in cerrado rupestre. The cerrado rupestre studied showed structural similarities with the physiognomy of open cerrado (cerrado ralo). The richness and the species diversity are similar with other Brazilian savanna (cerrado stricto sensu areas of Brazil Central). The floristic composition revealed species predominantly from other physiognomies from the cerrado stricto sensu and to a lesser extent, species from forest formations from the bioma and endemics from this rocky environment. The floristic richness and diversity is similar to other savanna areas of Central Brazil. In structural terms, the density and basal area are similar to values found in open cerrado vegetation. The limiting environmental conditions, mainly edaphics, do not result in expressive changes in floristic composition, richness, and species diversity, but promoted reduction in density and basal area of the wood species in the cerrado rupestre studied.