%0 Journal Article
%T Potencial de seq¨¹estro de carbono em solos agr¨ªcolas sob manejo organico para redu  o da emiss o de gases de efeito estufa Carbon sequestration potential in agricultural soils under organic management to reduce greenhouse effect gas emissions
%A Jacimar Luis de Souza
%A Luiz Carlos Prezotti
%A Andr¨¦ Guar£¿oni M
%J IDESIA
%D 2012
%I Universidad de Tarapac¨¢
%X O aumento da concentra  o dos gases de efeito estufa na atmosfera poder¨¢ ter conseq¨¹¨ºncias graves para toda sociedade. O desflorestamento e o uso dos solos para a produ  o de alimentos t¨ºm contribu¨ªdo significativamente para aumentar a emiss o desses gases. Com o objetivo de monitorar o teor de mat¨¦ria organica e contabilizar o estoque de carbono de diversas unidades de solos, em ¨¢rea experimental de agricultura organica no estado do Esp¨ªrito Santo, Brasil, foi realizado um estudo, caracterizando anualmente 12 unidades de solo, no per¨ªodo de 1990 a 2000. Observou-se acr¨¦scimo nos teores de mat¨¦ria organica 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 fixa  o 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 agroecol¨®gico em sistema organico de produ  o permite elevar o teor de mat¨¦ria organica dos solos, pela reciclagem e seq¨¹estro de carbono atmosf¨¦rico, confirmando elevado potencial para reduzir as emiss es de Gases de Efeito Estufa, podendo contribuir para a redu  o do aquecimento global. The 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 Esp¨ªrito 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.
%K agricultura organica
%K aquecimento global
%K g¨¢s carb nico
%K organic agriculture
%K global warming
%K carbon dioxide
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-34292012000100002