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.

https://doi.org/10.1038/srep21450

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Quartile : Q1, Sujet : MULTIDISCIPLINARY SCIENCES

Résumé : 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.

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 - Systèmes et modes de culture
P33 - Chimie et physique du sol
P01 - Conservation de la nature et ressources foncières

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

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