This work presents an estimation of dry biomass (BS) above ground and stock of carbon (EC) agroforestry systems (SAF), studied in the floodplains of the river Juba in Cametá, Pará. The BS was estimated by the indirect method from the data of a forest inventory carried out in seven plots of 0.25 ha (50 m x 50 m). They were surveyed on average 2594 individuals/ha with DBH >5 cm. Euterpe oleracea Mart.(açaí) and Theobroma cacao L. (cacao), were the most important species and represented 80 % of the individuals (54 % and 26 %, respectively) and the others species (trees) 20 %. On average the BS of the SAF was of 298.44 t/ha. Açaí presented BS of 4.47 t/ha (43 % in leaves and 57 % in stems), cacao 1.45 t/ha (18 % in leaves and 82 % in wood) and the trees 292.52 t/ha (1 % in leaves and 99 % in wood). The EC contained in the BS average total was 134.30 t/ha; the trees had about 131.63 t/ha (98 %), açaí 2.01 t/ha (1.5 %) and cacao 0.65 t/ha (0.5 %). The EC average of SAF studied (average age of 12 years) represented, on average, about of 96 % of carbon that is storaged in a primary forest, about of 62 % more than of storaged in enriched secundary forest (average age of 26 month) and 23 % more than of storaged in forest of floodplains in brasilian Amazonia.
Agroforestry systems; biomass; carbon; floodplains; Amazonia