En el municipio de Pasto, Narino, se establecio 4 parcelas circulares de 500 m 2 , donde se realizo la medicion de variables dasometricas de arboles dispersos en potreros de motilon silvestre Freziera canescens, con el fin de estimar la biomasa aerea y determinar la capacidad de captura de carbono en esta practica silvopastoril tradicional. Para determinar la biomasa aerea y el C en las parcelas de muestreo se utilizo el metodo destructivo que consistio en aparear todos los individuos con diametros (dap) mayores a 10cm. Los arboles muestreados fueron separados en tres componentes: fustes, ramas y hojas, los cuales fueron pesados por separado en fresco, tomando una submuestra para ser sometida a 80 o C para determinar la biomasa seca. Se realizaron pruebas de recoleccion probando diferentes modelos lineales, cuadraticos y logaritmicos, para lo cual se utilizo el programa Stagraphics plus version 5.1; se probaron modelos alometricos para estimar la biomasa aerea total, en funcion de las variables diametro a la altura de pecho (dap), altura total, area basal y volumen., siendo los dos de tipo exponencial los que se ajustaron con mayor precision a los datos reales de biomasa. Se encontro que el diametro es la variable predictora mas significativa de la biomasa aerea total, con el modelo de la forma. Y= exp(2,61282 + 13,9972*dap), Para el motilon silvestre se determino una biomasa aerea de 9,57 ton/ha, que equivale a 4.78 ton de C/ha. ABSTRACT In the municipality of Pasto, Narino, 4 circular plots of 500 m 2 were established, which made measuring variables dasometric of scattered trees in pastures of Freziera canescens, in order to estimate the aerial biomass and the ability to determine carbon uptake in this forest grazing traditional practices. To determine the aerial biomass and the C in the sampling plots was used a destructive method, it was felled all individuals (dap) with diameters greater than 10 cm. the trees sampled were separated into three components: trunk, branches and leaves, which were weighed separately in cool, tanking a subsample to be subjected to 80 o C for determining the dry biomass. Tests of correlation testing different models linear were done, quadratic and logarithmic, which used the program Stagraphics plus version 5.1; allometric models were tested to estimate the total aerial biomass, depending on the variable diameter at breast height (dap), total height, basal area and volume, being the kind of exponential which were adjusted to more accurately to the real data of biomass. It was found that the diameter is the most significant predictor variable of the total aerial biomass, with the model of the form. Y= exp(2,61282 + 13,9972*dap). For Freziera canescens was identified a aerial biomass of 9,57 ton/ha, equivalent to 4.78 ton of C/ha.