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The soil quality of cultivated areas is highly dependent on management practices aimed at maintaining the level of organic carbon and increasing its stock. Palabras clave: Atributos físicos, stock de carbono, agricultura familiar, yuca, SAF's. Thus, the objective of this work was to comparatively evaluate the physical attributes, carbon stock and Microbial Biomass Carbon of the soils of two agroecosystems (cassava and agroforestry) and an ecosystem (secondary forest), in the João Batista settlement, Castanhal-Pará municipality. In the evaluation of the soil quality of the treatments, the attributes Granulometry, Global Density (DGS), Total Porosity (PT), Current Humidity (UA), Total Organic Carbon (COT), Soil Carbon Stock (ECS), Microbial Biomass Carbon (C-BM) and Microbial Soil Quotient (qMIC), whose analyzes were performed at the IFPA-Campus Castanhal Soil Laboratory. . Soil samples from the study areas were collected in plots at a depth of 0.00-10 cm, using cylinders, in the less rainy period of the year in the region. The experiment was conducted in a randomized block design with three treatments (cassava, agroforestry and secondary forest) in three replications. In the results of the attributes DGS, PT, UA, COT and ECS, depending on the treatments, significant effects of the managements were found, while for C-BMS and qMIC, non-significant effects. In general, it was noticed in the results demonstrated in this research that the managements used in the Cassava and SAF agroecosystems, as the use of intensive crops added to the non conservationist practices, contributed, in part, to the low physical, chemical and biological qualities of the soils of the studied treatment areas, especially the Native Forest, because, in most physical and biological attributes, it presented better results, although still considered with low levels of physical, chemical and biological qualities, which has been reflected in the its slow regeneration.

AVALIAÇÃO DOS ATRIBUTOS FISICOS E ESTOQUE DE CARBONO DO SOLO SOB DIFERENTES SISTEMAS DE PRODUÇÃO NO ASSENTAMENTO JOÃO BATISTA, CASTANHAL- PA.