The objective of this study was to estimate the sequestration of carbon under various land- use systems (LUS) in comparison with that of cocaine (Erythroxylon coca Lam.) cultivation. The ten land use systems evaluated were: cocaine, secondary forest, and eight agroforestry systems (AFS): AFS citric (Citrus sinensis L) established for 30 and 15 yr; AFS cocoa (Theobroma cacao L.) both traditional and improved; AFS pupunha (Bactris gasipaes Kunth); AFS coffee (Coffea arabica L); SPS Echinochloa polystachya HBK, and Paspalum conjugatum Berg. Established technology was used to estimate carbon contents. Unlike cocaine monoculture, the other LUS were characterized by great botanical diversity, which permitted the storage of different quantities of carbon, depending upon age of the systems, with those up to five years of age (AFS coffee, AFS pupunha, improved SSP) exhibiting greater carbon accumulation than those of older age. The AFS were similar in storage of carbon in total biomass and in aerial biomass, but varied in carbon storage in the soil and differed from cocaine cultivation.
O estudo teve como objetivo estimar o estoque de carbono em sistemas de uso-da-terra (SUT) e comparar com o do cultivo da coca Erythroxylon coca Lam. Avaliaram-se 10 sistemas de uso-da-terra: coca, capoeira, e oito sistemas agroflorestais (SAF): SAF cítrico (Citrus sinensis L) de 15 e 30 anos; SAF cacau (Theobroma cacao L.) tradicional e melhorado; SAF pupunha (Bactris gasipaes Kunth); SAF café (Coffea arabica L.); SSP Echinochloa polystachya HBK, e Paspalum conjugatum Berg. A metodologia usada foi a indicada para determinar carbono. Os SUT mostram uma grande diversidade florística a diferença da coca, que permite armazenar diferentes quantidades de carbono, estando ligado esses fatores à idade dos sistemas, sendo aqueles com ate cinco anos (SAF café, SAF pupunha, SSP melhorado) as que apresentaram maior acumulo que aqueles de maior idade. O armazenamento de carbono total e biomassa aérea es muito semelhante nos sistemas agroflorestais mais variam em quanto ao carbono no solo e com a coca.
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