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espanolSe seleccionaron 50 potreros con 10 anos de establecimiento asociados con especies arboreas, se realizo el inventario de las especies dispersas con diametros de altura al pecho (DAP) ≥ 5 cm. En cada arbol se midieron las variables dasometricas DAP, altura total, area de copa. Se determino su frecuencia, riqueza, abundancia, indice de valor de importancia, indice de biodiversidad basada en la abundancia proporcional de especies (Shannon, Simpson) y de riqueza de especies (Margalef). Se registraron 22 familias, el 83,8% corresponden a especies maderables y el 16,2% a especies frutales, la familia con mayor numero de individuos fue Boraginaceae con 194 individuos. El DAP explico el 96% de la variacion del area basal, a medida que este se incremento y las estructuras de las especies arboreas no demostraron inuir en la produccion de materia seca, cobertura y calidad de las pasturas, debido a la baja cobertura arborea (3,69 ± 0,67%) y al numero de arboles dispersos en los potreros (5 a 7 arboles ha−1). El impacto de la cobertura arborea demostro que incide signicativamente en el crecimiento de las plantas, demostrando que el cultivar Marandu tiene una mejor tolerancia a la sombra respecto al Dallis y Saboya. Se concluye que los ecosistemas ganaderos Amazonicos del centro norte del Ecuador de acuerdo a los indices de biodiversidad estarian considerados como bajos, pero con una riqueza media de especies dispersas en potreros. Se identico 4 especies con mayor peso ecologico superior al promedio (3,4%) Cordia alliodora, Cedrela odorata, Schizolobium parahybum y Psidium guajava. EnglishFifty paddocks of ten years of establishment associated with tree species were randomly selected; an inventory of all dispersed species with breast height diameters (DBH)≥5 cm was made. Dasometric variables as DBH, total height and crown area were measured in each tree. Frecuency, richness, abundance, importance value index, biodiversity index based on proportional abundance of species(Shannon,Simpson) and species richness(Margalef) were determinated. 22 tree families were registered,83.8%correspond to timber species and 16,2% to fruit species,the family with the highest number of individuals was Boraginaceae with 194,96% of variation of the basal area was explained by BDH. As far as this increased and the structure of tree species do not shown any inuence in dry matter production, cover and quality of the three found pasturages, due to low tree cover (3,69±0,67%) and to the number of dispersed trees in the paddocks (5 to 7 trees ha−1). The impact of tree cover showed that it affects signicantly on the growth of the plants, demonstrating that Marandu has the best shadow tolerance respect to Dallis and Saboya. It is concluded that the amazonian livestock system of northem central Ecuador according to the biodiversity indexes could be considerate as low levels, but with a medium richness of dispersed tree species on paddocks. The importance value index allowed identifying 4 species with the highest ecological weight over the average (3,4%) Cordiaalliodora, Cedrela odorata, Schizolobium parahybum and Psidium guajava.

Árboles dispersos y su efecto en la productividad de los potreros en la amazonia ecuatoriana