Floristic and Phytosociology in a Semideciduous Seasonal Forest - Osununú Private Reserve, Misiones, Argentina

This survey was conducted in a fragment of Semideciduous Seasonal Forest (Misiones, Argentina) in order to analyze the phytosociological variable of tree species by means of area stratification according to geomorphology. Initially, based on the slope and through photointerpretation, the area was compartmentalized in lowland, hillsides with intermediate slopes and high slopes, and highlands. Within each compartment, three plots composed of four 100 m² sub-units were allocated; totaling 48 sub-units, where all trees with circumference at breast height ≥ 10 cm were included, and soil depth and slope were measured. Sampling comprised 72 species, 59 genera, and 31 families. Variations were detected regarding species and importance values obtained according to the topographic gradient. In the Canonical Correspondence Analysis, the coverage values of species showed significant correlation with the parameters of soil depth and slope.

phytosociology; arboreal stratum; topographic gradient