The phytosociological survey in pastures in the municipality of Denise, MT

Abstract

This work aimed to identify and quantify the weeds in grazing areas in the municipality of Denise, MT. The survey was realized in 10 properties, were sampled 10 plots of 25 m2 in each property, totaling 2500 m2. The weeds were counted and identified and the values of density, frequency, abundance, relative density, relative frequency, relative abundance and importance value index (IVI) were analyzed. In the 100 sampled areas it was identified 3,669 individuals, distributed in 15 families and 31 species. The most important families in number of species were Malvaceae (6), Asteraceae (4) and Fabaceae (4). Malvaceae was the most important family in number of individuals representing 20.49% of the total of the weeds found. Andropogon bicornis was the specie that presenting greatest values of density and relative density. Regarding to the frequency and relative frequency, Sida carpinifolia was the most eminent specie, and Richardia scabra was the most important specie for abundance and relative abundance. The species that presented the greatest values of IVI in the properties were Andropogon bicornis (38.70), Sida carpinifolia (34.72), Mimosa wedelliana (29.79) and Richardia scabra (27.19).