Florística e fitossociologia em um campo manejado na serra do sudeste, Rio Grande do Sul

Abstract

Floristic and fitossociological surveys were performed on an area grazed by cows and domestic sheep; located in Canguçu, Serra do Sudeste, Rio Grande do Sul. Fourthy-three permanet plots (0,25m2) were evaluated based on their fitossociological parameters. A total of 173 species, 115 genera and 34 families were recorded. Poaceae (58 spp.), Asteraceae (20 spp.), Cyperaceae (14 spp.) and Fabaceae (10 spp.) were the more species-rich families. During the fitossociological survey, a total of 104 species distributed among “mantilho” (organic matter in decomposition), dry matter and naked soil were recorded. Paspalum notatum Flügge, Axonopus affinis Chase e Lolium multiflorum Lam. presented the higher values of absolute frequency and relative covering. Life-form and life-cycle were also evaluated. The hemicrypthophyta (63,46%) and geophytha (18,27%), as well as megathermic grasses were more frequent (68,42%).