Abstract
As part of an integrated forest vegetation and soil survey, tree species composition (DBH ≥10 cm) was recorded in 95 plots of 0.1 ha, distributed over the principal physiographic units in the middle Caqueta area, Colombian Amazonia. A total of 1077 tree species was found, classified into 271 genera and 60 families. Leguminosae and Sapotaceae show high familial importance values in all physiographic units. Lauraceae, Chrysobalanaceae, Moraceae, and Lecythidaceae are more important on well drained (flood plain or upland) soils, while Palmae, Guttiferae, Bombacaceae, and Apocynaceae are more important in swamps and on podzolised (‘white sand'rs) soils. Plots on well drained soils show a lower degree of dominance than plots in swamps or on podzolised (‘white sand’) soils. The composition of the most dominant species in the plots changes continuously. Most species (59%) are only recorded in one plot. Individual plot pairs generally show a low overlap of about 2–5 tree species, resulting in Jaccard coefficients below 20%.
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