African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6577

Full Length Research Paper

Assessing the impact of different tillage systems and land uses on CO2-C emissions in Eastern Amazonia

Miércio Jorge Alves Ferreira Junior
  • Miércio Jorge Alves Ferreira Junior
  • Universidade Federal do Oeste do Pará-UFOPA, Doutorado, Rua Vera Paz, Santarém, Pará, Brazil.
  • Google Scholar
Raimundo Cosme de Oliveira Junior
  • Raimundo Cosme de Oliveira Junior
  • Embrapa Amazônia Oriental, Rua Vera Paz, Santarém, Pará, Brazil.
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Rodrigo da Silva
  • Rodrigo da Silva
  • Universidade Federal do Oeste do Pará-UFOPA, IEG, Rua Vera Paz, Santarém, Pará, Brazil.
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José Mauro de Sousa de Moura
  • José Mauro de Sousa de Moura
  • Universidade Federal do Oeste do Pará-UFOPA, IEG, Rua Vera Paz, Santarém, Pará, Brazil.
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Alírio Furtado Neto
  • Alírio Furtado Neto
  • Universidade Federal do Oeste do Pará-UFOPA, Doutorado, Rua Vera Paz, Santarém, Pará, Brazil.
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Marcos Ximenes Ponte
  • Marcos Ximenes Ponte
  • Universidade Federal do Oeste do Pará, Rua Augusto Corrêa, s/n, Campus profissional II, Guamá, Belém, Pará, Brazil.
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Troy Patrick Beldini
  • Troy Patrick Beldini
  • Universidade Federal do Oeste do Pará-UFOPA, IEG, Rua Vera Paz, Santarém, Pará, Brazil.
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  •  Received: 11 February 2017
  •  Accepted: 01 June 2017
  •  Published: 27 July 2017

Abstract

The production and emission of CO2 in native, pasture and cultivated areas is a result of microbiological activity and mineralization of organic matter, and depends on favorable environmental factors, such as temperature, availability of water and of land use. The results of this work show that the no tillage system (NT) has the potential to mitigate 37.7% of C-CO2 efflux from cultivation of soy compared to conventional tillage (CT). The temperature of the soil accounted for 65% of the variability of the flux of CO2-C in CT. The variation of soil moisture explained 73 and 51% of the flux of CO2-C in CT and NT, respectively. These results indicate that soil moisture and soil temperature were controlling factors of CO2-C emissions from soil to atmosphere because these parameters directly affect soil microbial activity. The results also show that the active pasture had the highest outflows of soil CO2-C to the atmosphere in relation to forests and degraded pasture in Western Pará. Furthermore, it was shown that both the pastures and forests have seasonality in the fluw, which mainly related to precipitation patterns and water potential between soil and air. We observed a strong correlation between the efflux and soil moisture of both capoeira and in the pastures, as the soil temperature was a controlling factor of the active efflux only in the pasture. The average fluw of CO2-C obtained in pasture active was 218.9 mg C m-2 h-1 value of 40.7% higher than the primary forests and 155.5 mg C m-2 h-1. Finally, the results presented here suggest that the conventional tillage and pasture management are activities strongly associated to human enhance biogeochemical changes in the balance of carbon in these ecosystems, since the efflux of CO2-C is related to soil primary productivity of these ecosystems.

Key words: Greenhouse effect, land use change, carbon cycle, soil CO2-C efflux.