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The characteristics of tree species in a riverside forest were investigated from forest inventory and tree ring analysis of stem transection in three quadrats (100 m2 each) along the Duda River in Macarena National Park, Colombia. As the distance from the river channel became longer, the number of individual trees decreased from 103 to 45 (/100 m2), while the canopy height increased from 10 m to 20 m, the diameter at breast height DBH) increased from 10 cm to 25 cm, and the summation of (DBH)2H also increased from 1.39 m3 to 11.62 m3. Cecropia membranacea was widespread in all the quadrats. This species has the characteristic of fast thickening growth in the early stages but the cycle between establishment and death is shorter than 10 years even in a landside quadrat. Because the vessel diameter is larger than 250 μm, however, it is estimated to be one of the first tree species to be established in a riverbank. Ficus insipida and Piptadenia flava are believed to be canopy species because they have a large vessel diameter and their growth rate is steady. On the other hand, species with a small vessel diameter such as Guarea guidonia and Inga bomplandiana mainly have thickening growth rather than extension growth and remain as the medium and shrub species.

Tree Species and Tree Ring Characteristics of a Riparian Forest in La Macarena, Upper Colombian Amazon