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Evidence of limited carbon sequestration in soils under no-tillage systems in the Cerrado of Brazil

Corbeels Marc, Marchao Robélio, Neto Marcos Siqueira, Garcia Ferreira Eliann, Madari Beata Emöke, Scopel Eric, Brito Osmar Rodrigues. 2016. Evidence of limited carbon sequestration in soils under no-tillage systems in the Cerrado of Brazil. Scientific Reports, 6 (21450), 8 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q1, Sujet : MULTIDISCIPLINARY SCIENCES

Abstract : The Brazilian government aims at augmenting the area cropped under no-tillage (NT) from 32 to 40 million ha by 2020 as a means to mitigate CO2 emissions. We estimated soil carbon (C) sequestration under continuous NT systems in two municipalities in the Goiás state that are representative of the Cerrado. A chronosequence of NT fields of different age since conversion from conventional tillage (CT) was sampled in 2003 and 2011. Soil C levels of native Cerrado and pasture were measured for comparison. After about 11 to 14 years, soil C stocks under NT were highest and at the levels of those under natural Cerrado. Average annual rates of soil C sequestration estimated using the chronosequence approach were respectively 1.61 and 1.48 Mg C ha−1 yr−1 for the 2003 and 2011 sampling, and were higher than those observed using repeated sampling after eight years. The diachronic sampling revealed that the younger NT fields tended to show higher increases in soil C stocks than the older fields. Converting an extra 8 million ha of cropland from CT to NT represents an estimated soil C storage of about 8 Tg C yr−1 during 10 to 15 years. (Résumé d'auteur)

Mots-clés Agrovoc : Non-travail du sol, Stockage, Carbone, Matière organique du sol, séquestration du carbone, Teneur en matière organique

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Cerrado

Classification Agris : F08 - Cropping patterns and systems
P33 - Soil chemistry and physics
P01 - Nature conservation and land resources

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Corbeels Marc, CIRAD-PERSYST-UPR AIDA (KEN)
  • Marchao Robélio, EMBRAPA (BRA)
  • Neto Marcos Siqueira, Universidade de São Paulo (BRA)
  • Garcia Ferreira Eliann, UEL (BRA)
  • Madari Beata Emöke, EMBRAPA (BRA)
  • Scopel Eric, CIRAD-PERSYST-UPR AIDA (FRA) ORCID: 0000-0003-2938-6587
  • Brito Osmar Rodrigues, UEL (BRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580288/)

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