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Forest structure into three environmental situations in a araucarian forest in Misiones, Argentina. Tree structure was evaluated at Cruce Caballero Park, into 82 plots (10 x 20 m) across three pedological compartments: Red Latosol (54), Litolic Neosol (20) and Melanic Gleysols (8). All individuals with diameter than 4,8 cm were sampled. In the total, 116 species were found the three compartments. The horizontal structure showed some differences among the three compartments, having as common characteristics an expressive reduction of the large tree density. In the Red Latosol compartment, the phytosociological parameters indicated an equitable distribution of the main species, highlighting in importance percentual Sorocea bonplandii (6,46%), Cabralea canjerana (6,44%), Ocotea lancifolia (5,43%), Araucaria angustifolia (5%) and Apuleia leiocarpa (4,77%). Araucaria angustifolia showed the highest absolute density into this compartment (6,48 ind./ha), being lower comparing with brasilian araucaria forests. Few species occupy the horizontal space on the Litolic Neosol: Gymnanthes concolor (14,20%), Trichilia claussenii (8,51%), Apuleia leiocarpa (3,71%) and Pilocarpus pennatifolius (3,65%)., The horizontal space is shared by seven species in the Melanic Gleysols compartment: Parapiptadenia rigida (10,21%), Alchornea triplinervia (8,22%), Luehea divaricata (7,95%), Erythrina falcata (6,68%), Myrsine lorentziana (6,53%), Nectandra lanceolata (5,44%) and Cabralea canjerana (4,91%). The forests in the three compartments showed low similarity among them, specially the Melanic Gleysols with the other two. In conclusion, soil feature, groundwater regime and topographical conditions affect the forest structure.

VARIACIONES ESTRUCTURALES DE LA VEGETACION ARBOREA EN TRES AMBIENTES DE UNA SELVA CON ARAUCARIA EN MISIONES, ARGENTINA