Changes in soil organic carbon storage under different agricultural management systems in the Southwest Amazon Region of Brazil

Autor(es)

Maia, Stoecio M. F. ^[1] ; Ogle, Stephen M. ^[2] ; Cerri, Carlos C. ^[3] ; Cerri, Carlos E. P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo ESALQ USP, Escola Super Agr Luiz de Queiroz, Dept Ciencia Solo, BR-13418900 Piracicaba, SP - Brazil

^[2] Colorado State Univ, Nat Resource Ecol Lab, Ft Collins, CO 80523 - USA

^[3] Univ Sao Paulo CENA USP, Ctr Energia Nucl Agr, BR-13416000 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOIL & TILLAGE RESEARCH; v. 106, n. 2, p. 177-184, 2010.
• Citações Web of Science: 68

Resumo

The Cerrado and Amazon regions of Brazil are probably the largest agricultural frontier of the world, and Could be a sink or source for C depending on the net effect of land use change and subsequent management on soil organic C pools. We evaluated the effects of agricultural management systems on soil organic C (SOC) stocks in the Brazilian states of Rondonia and Mato Grosso, and derived regional specific factors for soil C stock change associated with different management systems. We used 50 observations (data points) in this study, including 42 dealing with annual cropping practices and 8 dealing with perennial cropping, and analyzed the data in linear mixed-effect models. No tillage (NT) systems in Cerrado areas increased SOC Storage by 1.08 +/- 0.06 relative to SOC stocks under native conditions, while SOC storage increased by a modest factor of 1.01 +/- 0.17 in Cerradao and Amazon Forest conditions. Full tillage (FT) had negative effect on SOC storage relative to NT, decreasing SOC stocks by a factor of 0.94 +/- 0.04. but did not significantly reduce SOC stocks relative to native levels when adopted in the Cerrado region. Perennial cropping had a minimal impact on SOC stocks, estimated at a factor Value of 0.98 +/- 0.14, suggesting these systems maintain about 98% of the SOC stock found under native vegetation. The results Suggest that NT adoption may be increasing SOC with land use change from native vegetation to cropland management in the Cerrado region of Brazil. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 05/59012-1 - Impacto ambiental da expansão da agricultura no sudoeste da Amazônia
• Beneficiário: Carlos Clemente Cerri
• Modalidade de apoio: Auxílio à Pesquisa - Temático