Variáveis ambientais e a distribuição de espécies arbóreas em uma floresta estacional decidual no Triângulo Mineiro

Abstract

The objective of the present study was to characterize the phytossociological structure of trees in a dry deciduous forest and to correlate the distribution of the most abundant species in the forest with environmental factors (soil and topography). For the phytossociological survey fifty 10m x 20m plots were laid out, totaling 1 ha, where all the trees with a minimum circumference of 15 cm at 1,30m were sampled. Composite Soil samples were collected from each plot and analyzed for pH, organic C and from available P, K, Ca, Mg, Al, Fe, Mn, Zn and Cu. For obtaining of the unevenness in the study area the method of level hose was used. Canonical correspondence analysis (CCA), was used to verify the relationship between the distribution of the most abundant species (&#8805 10 individuals per ha) and the environmental variables. A total of 60 species distributed in 27 families with a Shannon index of 2,84 nats/individual. Myracrodruon urundeuva Allem. and Tabebuia roseo-alba (Ridl.)Sandwith, represented 32,6% of total importance value. The soil rich in Ca, Mg and P and with low values of Al and Fe. In the correspondence canonical analysis it was evidenced that most of the species is distributed at the whole forest, just altering your abundances because of variations in the readiness of nutrients of the soil and topographical conditions, however not being restricted the those factors.