Estoques de carbono em floretas, capoeiras e sistemas agroflorestais da Amazonia Oriental

Abstract

This research aims to quantify and compare the carbon stocks in different land uses in the Eastern Amazon. Carbon was estimated in above ground biomass, necromass, soil and as a whole the total carbon in dense evergreen lowland, seasonally flooded forest (restinga), complex, commercial and home garden multiestrata agroforestry systems, fallows and pasture. Total carbon in dense evergreen lowland (164.0 Mg ha-1) and complex agroforestry systems (161.6 Mg ha-1) was significantly higher compared with enriched fallows (71.6 Mg ha-1) and pasture areas (43.9 Mg ha-1). Seasonally flooded forest, old agroforestry and fallow systems stored intermediate amounts. Large trees (> 50 cm DBH) stored significant amounts of carbon in vegetation, in mature commercial agroforestry systems this large trees stored 83 Mg ha-1 (89%), in complex agroforestry systems 78 Mg ha-1 (63%) and in dense evergreen lowland 47 Mg ha-1 (39%). The soil carbon stocks pastures were significantly lower compared to all land uses evaluated. Agroforestry systems have high carbon storage potential while substitution of forests for pasture areas involves drastic losses in all components of carbon storage