Resumen

FARINHA WATZLAWICK, Luciano; GARDIN, Edson  y  MAZON, Joelmir Augustinho. Floral and phytosociology in Park steppe savannah areas in Barra of Quaraí-RS, Brazil. Investig. Agrar. [online]. 2016, vol.18, n.1, pp.37-43. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2016.junio.37-43.

The study aimed at comparing the floral composition, diversity, spatial distribution and horizontal structure of tree species in two different areas, identified as “A” and “B”, Park Steppe Savannah, located in the Espinilho state Park, southwestern end of the Rio Grande do Sul State, Brazil. The study was carried out using data from two standing units, one hectare each, divided into one hundred subunits measuring one hundred square meters (10 x 10 m) each. Trees with a diameter of 10 cm or above 10 cm at breast height (DBH) were evaluated. Horizontal structure was evaluated by phytosociological parameters: abundance, dominance, frequency. The richness and diversity of the areas were calculated by the Shannon diversity index (H'). Sorensen similarity index was used for the analysis of floristic similarity between the two areas, whereas spatial dispersion of species was analyzed by the Morisita Standardized dispersion index. The comparison between the two areas showed that Espinilho State Park is made up of different types of vegetation, resulting in differences in horizontal structures, diversity and spatial distribution pattern, being Prosopis affinis, the dominant species in area A  whereas in area B,   Prosopis nigra was the dominant one.

Palabras clave : Spatial dispersion; floristic diversity; phytosociology; similarity index; Steppe Savannah Park.

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