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The tropical dry forest is a typical lowland ecosystem that is threatened by a strong seasonality and anthropogenic pressures, which can affect the forest composition and structure. The objective of this study was to estimate the impact of two agricultural matrices on the floristic composition and carbon storage in riparian forests. For this, five permanent plots (10 x 10 m each) were established and sampled in the forest interior and at the edge of two agricultural matrices (rice fields and pasture lands), in July 2013. All individuals with a diameter at breast height (dbh) ≥ 5 cm were recorded and measured, and the aboveground biomass was estimated with a general allometric model. Additionally, the importance value index (IVI), species richness and Alpha´s diversity indexes were estimated; an analysis of variance and means comparison tests of Fisher LSD were also carried out. A total of 32 families, 21 genera and 45 species (29 and 33 species in pasture lands and rice fields, respectively) of trees in 0.2 ha were recorded. The most abundant and most ecologically important species were Oxandra espintana and Calliandra sp. (520 and 241 individuals/ha and 72 and 48 % of IVI, respectively). These forests presented a mean dominance of 33.9 m 2 /ha with no effect (P 0.05) the Alpha diversity indexes. The biggest trees and greatest carbon storage were found in forests with pasture matrices when compared to rice fields (14.6 vs 13.4 cm of dbh and 72.9 vs 45.6 t C/ha, respectively). This research provides an understanding of the tree richness and composition and carbon storage of riparian forests in two agricultural matrices, which could be a basis for the establishment of silvopastoral systems with native species.

Composición florística y reservas de carbono en bosques ribereños en paisajes agropecuarios de la zona seca del Tolima, Colombia