Resumo

LOSS, Arcângelo et al. Evolution and accumulation of C-CO₂ in different agroecological production systems. Acta Agron. [online]. 2013, vol.62, n.3, pp.242-250. ISSN 0120-2812.

The C-CO² evolution via soil microbial activity can be used as a parameter to highlight differences in agroecological production systems. This work aimed to evaluate the microbial activity of soil through the evolution of C-CO² (mineralizable carbon) from the respiration of microorganisms under different production systems. Was selected five areas: cultivation of fig; passion fruit consortium - Desmodium sp.; cultivation of corn/beans, with conventional tillage (CT) of the soil, cultivation of eggplant/corn under no-tillage (NT) and agroforestry system (AFS). Soil samples were collected at depths of 0.0 - 0.05 and 0.05 - 0.10 m, and was assessed microbial activity (C-CO² evolution in the laboratory) and the accumulation of C-CO² for 37 days. Soon after hatching, all systems evaluated showed peaks of C-CO², with variations of these peaks more pronounced until the 9th day of evaluation. At 21 days there is stabilization of microbial activity. Growing fig resulted in higher peaks of C-CO² evolution, and also higher accumulations at the end of the 37 day trial. The acreage under NT agroecological showed lower accumulation of C-CO². The conventional tillage resulted in lower peak C-CO² at a depth of 5-10 cm.

Palavras-chave : Agroecology systems; microorganisms; mineralizable carbon; respiration.

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