Resumo

GAMEZ, Arnaldo; DE GOUVEIA, María; ALVAREZ, Winston  e  PEREZ, Henry. Weed flora in a conuco type agroecosystem in the community of Santa Rosa de Ceiba Mocha, Guárico State, Venezuela. Bioagro [online]. 2014, vol.26, n.3, pp.177-182. ISSN 1316-3361.

In order to contribute to the overall knowledge of the vegetation associated with production systems, a study of the diversity of weeds within a conuco type agroecosystem in the community of Santa Rosa de Ceiba Mocha, Infante municipality, Guárico State, Venezuela, was conducted. Sampling was performed using the known framework method in the minimum sampling area. In 15 sampling points, a 0.25 m² metallic frame was launched at random, and the enclosed weeds were counted, stored and pooled. Population parameters of the weeds such as density, frequency and dominance, were calculated; the importance value index (IVI) was also determined. Twenty-four weed species in 14 botanical families were found. Poaceae was the most represented family with five species, followed with Asteraceae with three species. Species with the highest density were Cyanthillium cinereum, Bidens pilosa and Lindernia crustacea, with values of 216, 209 and 90.67 plants·m^-2. The most frequent species were L. crustacea and Digitaria sanguinalis with values 90 and 80 %, respectively. The highest values of dominance were reported for the species B. pilosa, L. crustacea and D. sanguinalis, with 24.08, 23.50 and 13.59 %, respectively. Likewise, the species with the highest importance value index (IVI) were B. pilosa (0.50), L. crustacea (0.45), D. sanguinalis (0.31), and C. cinereum (0.28). Biodiversity of weeds present in this type of production systems was evident.

Palavras-chave : Weed density; frequency and dominance; importance value index; agricultural systems.

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