Levantamento da vegetação arbustiva arbórea de um fragmento de Mata Atlântica localizado na APA do Pratigi, Ibirapitanga- Bahia- Brasil

Abstract

The aim of this study was to conduct floristic and phytosociological survey of an area of tropical rain forest in the area of pratigi Environmental Protection. 2239 individuals were measured with DBH ≥ 5 cm in twenty plots of 10 x 50 m in a section of 162 acres the APA, 66 botanical families, 138 genera and 342 tree species were identified. The physiognomy of the APA pratigi matches there is a Tropical Rain Forest Submontane, and based on the information obtained and the CONAMA Resolution No. 5 of May 4, 1994, is in the intermediate stage of regeneration. Considering the identified species, families with larger numbers of subjects were: Myrtaceae (136 ind.), Nyctaginaceae (122 ind.), Sapotaceae (103 ind.), Fabaceae (91 ind.), Euphorbiaceae (90 ind.), Lauraceae (81 ind.), Rubiaceae (74 ind.) and greater species richness were: Myrtaceae (55 spp.), Fabaceae (30 spp.), Lauraceae (29 spp.), Apocynaceae (12 spp.), Melastomataceae (12 spp.) Chrysobalanaceae (9 spp.), Annonaceae (8 spp.), Boraginaceae (8 spp.), Malvaceae (7 spp.), Clusiaceae (6 spp.). Stood out in the structural analysis: Guapira laxiflora (DR = 3.93; DoR = 1.84) and Alchornea glandulosa subsp. iricurana (DR = 2.32; DoR = 0.80 The average DBH of the study area was 13.2 cm and the diameter distribution reveals that 80.6% of individuals have dbh less than 18.5 cm, with concentration in the smaller diameter classes. The average basal area (m2/ha) and number of individuals (ind/ha) were respectively: 50.67 ± 5.34 and 2248 ± 133. The Atlantic Forest area studied have Shannon Wiener index (H ') of 4.05, value below average for Atlantic Forest, but also close to some areas in a good state of conservation, the evenness (J') was 0.695, average value of heterogeneity that can be explained by a large population of a single species.