Floristic, phytossociology analyses anda model to revegetation the SÃo Francisco river watershed/MG - Brazil / FlorÃstica, AnÃlise FitossociolÃgica e Modelo para revegetaÃÃo da bacia do Rio SÃo Francisco, Minas Gerais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

In the present research, 68 forest fragments along the SÃo Francisco river were studied in order to know the floristc composition of these areas, define the sampling sufficiency, compare and apply diversity and equability rates, describe areas similar points, determine the phytossociology; analyse and compare the height and diameter distributions, apply varied techniques of ordination to obtain the vegetation and environment correlation, create a phytogeographyc map for Rio SÃo Francisco basin. The inventoried individual were in CAP ≥ 15,7 cm criterium and the total height and CAP were presented. In a group of forest fragments, a systematic sampling was used in two stages; in the other fragment, a conglomerate sampling in systematic way was used. The sizes of the parts varied in accordance with the environmental characteristics, the maximum size was 1000mP2P (10m x 100m) and a control was done in every 25m (sub units). 685 species, 79 families and a total of 156.926 individual were founded. DCA and CCA were the analysis used and both proved the existence of a geo-climatic gradient linked with floristic compositium, whose variables more tested were: hydrologic deficit, hydrologic excedente, temperature and precipitacion. The assessment method of sampling sufficiency was the Plateau Linear Regression Method of the system for statistics analysis SAEG V.5.0. This procedure allow us to assess the sampling sufficiency in areas of different sizes, and the result show us that sampling was sufficient to catch the floristic range of all fragments. The variety followed a gradient in accordance with the fisionomic group in study. Some species were noticed with wide distribution in Rio SÃo Francisco basin. The phytogeographyc model was created using the tool knolled as the decision tree, that linked the species with some environmental variables: temperature, precipitation, hydrologyc defeicit and hydrologic excedente.

ASSUNTO(S)

recursos florestais e engenharia florestal suficiÃncia amostral de platà phytogeographyc model composiÃÃo florÃstica phytossociology floristic composition modelo fitogeogrÃfico fitossociologia sampling sufficieny the plateau

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