Diversidade e estrutura comunitária de cerrado sensu stricto em afloramentos rochosos no parque estadual dos Pireneus, Goiás

摘要

(Diversity and community structure of cerrado sensu stricto on rocky outcrops of the Pireneus State Park, Goiás). This study was conducted within the Pireneus State Park and its objective was to analyse the floristic composition and community structure of the woody layer of the cerrado sensu stricto on rocky outcrops and to compare with other places. The study area is located at 15°48'42"-47" S and 48°52'40"-63" W, with average altitude of 1,310 m. Ten 20 m × 50 m (1,000 m2) plots were randomly located and all woody individuals of 5 cm diameter at 30 cm from the ground level were identified and measured. Sixty five species belonging to 51 genera and 35 families were found. The richest families in species were: Myrtaceae (eight spp.), Fabaceae (seven spp.) and Melastomataceae (six spp.). The 12 species with highest VI were responsible for more than 50% of total density and dominance. The density was 1105 individuals ha-1 and basal area was 11.03 m2 ha-1. Shannon's diversity index (H') was 3.65 nats ind-1. These values are high and are within the range of other studies in cerrado sensu stricto. TWINSPAN classification of the Pireneus State Park's plots showed that this cerrado is composed by species characteristics of the site like Schwartzia adamantium (Cambess.) Bedell ex Giraldo-Ca?as, Alchornea triplinervia (Spreng.) Müll. Arg. and Clusia burchellii Engl., generalist species of "cerrado region" and also by species more common in gallery forests, and present similar structure to this vegetation in other edaphic conditions.