Análise da vegetação arbórea em um remanescente de cerradão em Bandeirantes,MS / Analysis of the arboreal vegetation of a cerradão remnant in Bandeirantes, MS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this study was to describe vegetation composition and structure of the tree community of a cerradão remnant in Bandeirantes/MS, besides verifying the dispersion syndrome, the pattern of spatial distribution of species with higher density and to accomplish the multitemporal analysis of the area and its surroundings. The studied area (19 5504"S and 54 2150"W) is located in Assentamento Barreirinho Flores and has 479,69 ha. Floristic and phytosociological analysis were performed in 16 plots of 25 x 25 m (1 ha). All individuals belonging to the arboreal stratum, with DBH (diameter at breast height ) ≥ 5 cm and height ≥ 3 m, were sampled and identified. The species and individuals were classified by functional and structural category (deciduocity, leaf texture and presence of pilosity) and dispersion syndrome (zoochory, anemochory and autochory). Determination of spatial distribution pattern was performed using Morisita index (Id) and the multitemporal analysis was determined using two satellite images, one from 1985 and the other from 2004. A total of 2118 individuals distributed in 34 families, 63 genera and 82 species were sampled. The species with higher IVI and IVIA were Rudgea viburnoides, Tapirira guianensis, Qualea parviflora, Q. grandiflora, and Xylopia aromatica. The basal area was 23,51 m2/ha. Shannon index (3,079) indicated high diversity of species and the equability (J) of 0,78 evidenced the tendency of homogenous distribution of individuals per species. The diametric and height distribution revealed the concentration of individuals in the inferior vegetation stratum and in classes of smaller diameters, indicating that the area is in regeneration. The high density of evergreen individuals (47%) suggests that the studied area is not subject to periods of water deficit. The predominant dispersion syndrome was the zoochory (48% of the species and 64,5% of the individuals), evidencing the importance of T. guianensis and R. viburnoides as food suppliers to the local fauna. The multitemporal analysis demonstrated a reduction of 81,8% of the original vegetation of the area. Regeneration of the studied fragment was probably due to its localization, contiguous to a larger fragment that acted as colonizer source. It was verified an aggregated pattern of spatial distribution to T. guianensis, R. viburnoides, Q. parviflora and X. aromatica, and to Q. grandiflora the pattern was alleatorious. Data obtained in this study provides subsidies to future conservationist actions and evidences the importance of the studied remnant as matrices supplier and to the conservation of the local diversity.

ASSUNTO(S)

ecologia do cerrado cerrado fitossociologia spatial pattern síndrome de dispersão análise multitemporal phytosociology ecologia padrão espacial multitemporal analysis cerrado dispersal syndromes

Documentos Relacionados