Arboreal component, phytosociology structure and environmental relations in a remnant of cerrad?o, Curvelo - MG

Neste trabalho, objetivou-se verificar a exist?ncia de varia??es na composi??o e distribui??o das esp?cies arb?reas em virtude das caracter?sticas do solo, em um fragmento de cerrad?o distr?fico, no munic?pio de Curvelo-MG. Para a descri??o da comunidade arb?rea, foram instaladas dez parcelas permanentes de 1.000 m? (20 x 50 m) com dist?ncias fixas de 100 m entre cada parcela. Todos os indiv?duos arb?reos vivos com DAS (di?metro a 0,3 m do n?vel do solo) > 5,0 cm foram amostrados. Os indiv?duos de fuste bifurcado foram inclu?dos quando o valor dos DAS fundidos atendia ao crit?rio. Foram coletadas amostras de solo em duas profundidades (0-20 e 20-40 cm) e medida as dist?ncias das parcelas a um curso de ?gua. Para estudar a comunidade, foram gerados diagramas de ordena??o de parcelas, esp?cies e vari?veis ambientais por meio da an?lise de correspond?ncia can?nica (CCA). A riqueza amostrada foi de 92 esp?cies, 36 fam?lias e 74 g?neros, destacando Erythroxylum, Byrsonima, Myrcia e Qualea. Os estimadores de jackknife (primeira e segunda ordem) projetaram uma riqueza de 106,4 e 107,8 esp?cies. As esp?cies Magonia pubescens, Terminalia argentea, Annona crassiflora, Eugenia dysenterica e Xylopia aromatica apresentaram-se distribu?das sob gradiente em fun??o de vari?veis ambientais.Funda??o de Amparo ? Pesquisa do Estado de Minas Gerais (FAPEMIG)Empresa de Pesquisa Agropecu?ria de Minas Gerais (EPAMIG)Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq)Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES)This work aimed to verify the existence of variations in composition and distribution of tree species due to soil characteristics in a fragment of dystrophic savanna in Curvelo-MG. On description in the compartment of the phanerophytes of this plant community, were installed ten permanent plots with 1.000 m? (20 x 50 m) with fixed distances of 100 m between each plot. All alive individuals that had diameter at soil height (DSH - diameter to 0.3 m from ground level) > 5.0 cm were sampled. The Individuals with multiple boles were sampled when the value of square root of the sum-square of DSH had been greater than criterion of the inventory. Were collected Soil samples at two depths (0-20 e 20-40 cm) and was measured the distances of plots of a watercourse. To study the community were generated ordination diagrams of plots, species and environmental variables by means of a canonical correspondence analysis (CCA). The richness sampled was 92 species, 36 families and 74 genera, Erythroxylum, Byrsonima, Myrcia and Qualea. Jackknife estimators (first and second order) designed a wealth of 106.4 and 107.8 species. The species Magonia pubescens, Terminalia argentea, Annona crassiflora, Eugenia dysenterica e Xylopia aromatica were distribuited underneath the environmental gradient