Comparação do estoque de C estimado em pastagens e vegetação nativa de Cerrado

Abstract

Prof. Dr. do Instituto de Geografia-UFU. Bolsista CNPq. rrosa@ufu.br RESUMO:As mudanças climáticas constituem uma ameaça para o meio ambiente e para o desenvolvimento sustentável no mundo. -1 e a pastagem degradada 27,51 Mg C ha -1 , o que permite concluir que pastagens bem estabelecidas e manejadas, podem contribuir no aumento da taxa de sequestro de carbono pelo solo. Entretanto, a falta de correção do solo, de adubação de manutenção, de controle de processos erosivos e de manejo adequado, com excesso de lotação (sobrepastejo) têm levado a um estágio de degradação das pastagens cultivadas, o que compromete a capacidade das mesmas de seqüestrar carbono. Palavras-chave: estoque de C nos solos, pastagens, Cerrado. ABSTRACT:The climate changes are considered a threat to the environment and for the sustainable development in the world. They are caused by the increase in the greenhouse effect above the desirable level, mainly due to CO 2 , CH 4 and N 2 O in the atmosphere, even though CO 2 is the most abundant. The soils are recognized as important greenhouse gases sinks, especially for CO 2. The main objective of this paper was to compare the carbon stock stored in soils under pasture and soils under native cerrado vegetation, in Araguari River basin in Minas Gerais state. The research methodology involved the following steps: selection of the areas occupied by pastures and cerrado; collecting soil samples for carbon to define the carbon stock and laboratory analysis. With the support of TM/Landsat5 sensor, soil samples were collected in the field under improved pastures of brachiaria, degraded pastures of brachiaria and cerrado, at 0 to 20 cm and 20 to 40 cm depths. The results reached showed that the improved pasture to the layer from 0 to 20 cm showed a carbon stock of 43,92 Mg C ha -1 , while cerrado showed 38,05 Mg C ha -1 and the degraded pasture 34,63 Mg C ha -1 , while the depth from 20 to 40 cm, the improved pasture reached 33,5 Mg C ha -1 , the cerrado

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