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EnglishThe increase in the concentration of greenhouse gases in the atmosphere will have serious consequences for all of society. Deforestation and the use of soils for production of food have contributed significantly to increase the emission of greenhouse gases. With objectives to monitor the levels of organic matter and quantify the carbon content of diverse soil units in an organic agriculture research area in the State of Espirito Santo, Brazil, a study was carried out characterizing annually 12 units of soil, during the period of 1990 to 2000. An increase in the levels of organic matter and carbon in the system was observed. In the soil layer from 0 to 40 cm deep, the carbon content increasedfrom 34.571 ha-1 to 58.191 ha-1, with fixation of23.62 t ha-1 in 10 years, which corresponds to 86.621 ha-1 of COt It is concluded that agroecological management in an organic production system enables an increase in the level of organic matter of soils by recycling and sequestering atmospheric carbon, confirming the increased potential of organic agriculture to reduce greenhouse gas emissions and contribute to a reduction in global warming portuguesO aumento da concentracao dos gases de efeito estufa na atmosfera podera ter consequencias graves para toda sociedade. O desflorestamento e o uso dos solos para a producao de alimentos tem contribuido significativamente para aumentar a emissao desses gases. Com o objetivo de monitorar o teor de materia orgânica e contabilizar o estoque de carbono de diversas unidades de solos, em area experimental de agricultura orgânica no estado do Espirito Santo, Brasil, foi realizado um estudo, caracterizando anualmente 12 unidades de solo, no periodo de 1990 a 2000. Observou-se acrescimo nos teores de materia orgânica e de carbono do sistema. Na camada de 0 a 40 cm de profundidade, o estoque de carbono elevou-se de 34,57 t ha-1 para 58,19 t ha-1, com fixacao de 23,62 t ha-1 em 10 anos, o que corresponde a 86,62 t ha-1 de CO2. Conclui-se que o manejo agroecologico em sistema orgânico de producao permite elevar o teor de materia orgânica dos solos, pela reciclagem e sequestro de carbono atmosferico, confirmando elevado potencial para reduzir as emissoes de Gases de Efeito Estufa, podendo contribuir para a reducao do aquecimento global

Potencial de seqüestro de carbono em solos agrícolas sob manejo orgânico para redução da emissão de gases de efeito estufa