Quantifying above and belowground biomass carbon inputs for sugar-cane production in Brazil

Autor(es)

Silva-Olaya, A. M. ^[1] ; Davies, C. A. ^[2] ; Cerri, C. E. P. ^[3] ; Allen, D. J. ^[2] ; Mello, F. F. C. ^[4] ; Cerri, C. C. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Amazon, St 17, Diagonal 17, Cr 3F, Florencia 180002 - Colombia

^[2] Shell Technol Ctr Houston, 3333 Highway 6 South, Houston, TX 77082 - USA

^[3] Univ Sao Paulo Luiz de Queiroz, Coll Agr, Av Paduas Dias 11, BR-13400970 Piracicaba - Brazil

^[4] Univ Sao Paulo, Ctr Nucl Energy Agr, Av Centenario 303, BR-13416000 Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SOIL RESEARCH; v. 55, n. 7, p. 640-648, 2017.
• Citações Web of Science: 2

Resumo

Expansion of sugarcane crop due to the increasing demand for sugar and ethanol can affect both existing soil carbon (C) stocks, and subsequent input of new C from above and belowground biomass, influencing the overall C intensity and C payback times due to the change of land use. We present above and belowground dry biomass production, shoot-to-root ratio (S : R) as well as the net annual C inputs to the soil for sugarcane in different ratoon stages. The selected areas were as follows: (1) recently planted sugarcane area (PC), (2) first year ratoon cane (RC1) and (3) 4-year ratoon cane (RC4), which were established under Typic Quartzipsamments located in north-eastern Sao Paulo State. The sugarcane S : R ratios ranged from 6.6 in PC to 3.4 in RC4, and total sugarcane C inputs from 29.6 to 30.8 Mg C ha(-1). The overall C balance for land use change requires effects on soil C and also C inputs from previous and future land uses. The sugarcane C input was between 3.7 and 4.0 Mg C ha(-1) for each sugarcane cycle of 5 years. When accounting for soil C stock changes and aboveground biomass C losses from the prior land use, the payback times for sugarcane biofuel C debts are reduced by 3, 2 and 1 years for Cerrado wooded, Cerrado grassland and pasture conversions into sugarcane respectively. (AU)

• Processo FAPESP: 11/07105-7 - Estoques de carbono do solo na mudança do uso da terra para cultivo da cana-de-açúcar na região Centro-Sul do Brasil
• Beneficiário: Carlos Clemente Cerri
• Modalidade de apoio: Auxílio à Pesquisa - Regular