| Summary: | The research was carried out in four hectares of the Cuyaguateje river riparian forest, in the middle third of the basin, the section closest to the urban area of Guane, "Vega La Manzanilla". With the objective of evaluating its structure and composition, 12 plots of 400 m2 were raised; for the measurement of the diameter (D130), all individuals with a height greater than 2 m were considered. The floristic composition was evaluated; the horizontal structure was described in terms of frequency, abundance, dominance and Importance Value Index (IVI). The distribution of abundance by diameter classes was also carried out, the mixing ratio was determined and, finally, the margins were compared biologically with the Jaccard similarity index. The vertical structure was evaluated, taking into account three strata: Lower 2 to 5 m, intermediate> 5 to 10 m and upper> 10 m. The main results were: a floristic composition of 29 species, grouped into 18 families and 29 genera. The most dominant families were identified: Meliaceae, Sapindaceae, Mimosaceae, Anacardiaceae, Boraginaceae and Fabaceae; with greater ecological weight, species typical of the riparian flora were identified such as Samanea saman Jacq., Talipariti elatum Frixell (Sw), Sapindus saponarius L., Guazuma ulmifolia Lam. and some invasives, which should be watched as: Bambusa vulgaris Schrader, Gmelina arborea Roxb. there is high similarity between both margins. In general, it was concluded that a heterogeneous forest has been formed, with a high percentage of typical species of riparian forests, which shows a flora characterized by trees with height, and diameter (D1.30) above 10 and 0.13 m, respectively.
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