Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment
No-tillage mulch-based (NTM) cropping systems have been widely adopted by farmers in the Brazilian savanna region (Cerrado biome). We hypothesized that this new type of management should have a profound impact on soil organic carbon (SOC) at regional scale and consequently on climate change mitigation. The objective of this study was thus to quantify the SOC storage potential of NTM in the oxisols of the Cerrado using a synchronic approach that is based on a chronosequence of fields of different years under NTM. The study consisted of three phases: (1) a farm/cropping system survey to identify the main types of NTM systems to be chosen for the chronosequence; (2) a field survey to identify a homogeneous set of situations for the chronosequence and (3) the characterization of the chronosequence to assess the SOC storage potential. Themain NTM system practiced by farmers is an annual succession of soybean (Glycine max) or maize (Zea mays) with another cereal crop. This cropping system covers 54% of the total cultivated area in the region. At the regional level, soil organic C concentrations from NTM fields were closely correlated with clay + silt content of the soil (r2 = 0.64). No significant correlation was observed (r2 = 0.07), however, between these two variables when we only considered the fields with a clay + silt content in the 500- 700 g kg_1 range. The final chronosequence of NTM fields was therefore based on a subsample of eight fields, within this textural range. The SOC stocks in the 0-30 cm topsoil layer of these selected fields varied between 4.2 and 6.7 kg C m_2 and increased on average (r2 = 0.97) with 0.19 kg C m_2 year_1. After 12 years of NTM management, SOC stocks were no longer significantly different from the stocks under natural Cerrado vegetation (p < 0.05), whereas a 23-year-old conventionally tilled and cropped field showed SOC stocks that were about 30% below this level. Confirming our hypotheses, this study clearly illustrated the high potential of NTM systems in increasing SOC storage under tropical conditions, and how a synchronic approach may be used to assess efficiently such modification on farmers' fields, identifying and excluding non desirable sources of heterogeneity (management, soils and climate).
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dig-cirad-fr-5563972024-01-28T18:34:15Z http://agritrop.cirad.fr/556397/ http://agritrop.cirad.fr/556397/ Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment. Siqueira Neto Marcos, Scopel Eric, Corbeels Marc, Cardoso Alexandre, Douzet Jean-Marie, Feller Christian, De Cassia Piccolo Marisa, Cerri Carlos Clemente, Bernoux Martial. 2010. Soil and Tillage Research, 110 (1) : 187-195.https://doi.org/10.1016/j.still.2010.07.010 <https://doi.org/10.1016/j.still.2010.07.010> Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment Siqueira Neto, Marcos Scopel, Eric Corbeels, Marc Cardoso, Alexandre Douzet, Jean-Marie Feller, Christian De Cassia Piccolo, Marisa Cerri, Carlos Clemente Bernoux, Martial eng 2010 Soil and Tillage Research P33 - Chimie et physique du sol F08 - Systèmes et modes de culture carbone http://aims.fao.org/aos/agrovoc/c_1301 Brésil http://aims.fao.org/aos/agrovoc/c_1070 No-tillage mulch-based (NTM) cropping systems have been widely adopted by farmers in the Brazilian savanna region (Cerrado biome). We hypothesized that this new type of management should have a profound impact on soil organic carbon (SOC) at regional scale and consequently on climate change mitigation. The objective of this study was thus to quantify the SOC storage potential of NTM in the oxisols of the Cerrado using a synchronic approach that is based on a chronosequence of fields of different years under NTM. The study consisted of three phases: (1) a farm/cropping system survey to identify the main types of NTM systems to be chosen for the chronosequence; (2) a field survey to identify a homogeneous set of situations for the chronosequence and (3) the characterization of the chronosequence to assess the SOC storage potential. Themain NTM system practiced by farmers is an annual succession of soybean (Glycine max) or maize (Zea mays) with another cereal crop. This cropping system covers 54% of the total cultivated area in the region. At the regional level, soil organic C concentrations from NTM fields were closely correlated with clay + silt content of the soil (r2 = 0.64). No significant correlation was observed (r2 = 0.07), however, between these two variables when we only considered the fields with a clay + silt content in the 500- 700 g kg_1 range. The final chronosequence of NTM fields was therefore based on a subsample of eight fields, within this textural range. The SOC stocks in the 0-30 cm topsoil layer of these selected fields varied between 4.2 and 6.7 kg C m_2 and increased on average (r2 = 0.97) with 0.19 kg C m_2 year_1. After 12 years of NTM management, SOC stocks were no longer significantly different from the stocks under natural Cerrado vegetation (p < 0.05), whereas a 23-year-old conventionally tilled and cropped field showed SOC stocks that were about 30% below this level. Confirming our hypotheses, this study clearly illustrated the high potential of NTM systems in increasing SOC storage under tropical conditions, and how a synchronic approach may be used to assess efficiently such modification on farmers' fields, identifying and excluding non desirable sources of heterogeneity (management, soils and climate). article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/556397/1/document_556397.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.still.2010.07.010 10.1016/j.still.2010.07.010 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.still.2010.07.010 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.still.2010.07.010 |
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P33 - Chimie et physique du sol F08 - Systèmes et modes de culture carbone http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_1070 P33 - Chimie et physique du sol F08 - Systèmes et modes de culture carbone http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_1070 |
spellingShingle |
P33 - Chimie et physique du sol F08 - Systèmes et modes de culture carbone http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_1070 P33 - Chimie et physique du sol F08 - Systèmes et modes de culture carbone http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_1070 Siqueira Neto, Marcos Scopel, Eric Corbeels, Marc Cardoso, Alexandre Douzet, Jean-Marie Feller, Christian De Cassia Piccolo, Marisa Cerri, Carlos Clemente Bernoux, Martial Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment |
description |
No-tillage mulch-based (NTM) cropping systems have been widely adopted by farmers in the Brazilian savanna region (Cerrado biome). We hypothesized that this new type of management should have a profound impact on soil organic carbon (SOC) at regional scale and consequently on climate change mitigation. The objective of this study was thus to quantify the SOC storage potential of NTM in the oxisols of the Cerrado using a synchronic approach that is based on a chronosequence of fields of different years under NTM. The study consisted of three phases: (1) a farm/cropping system survey to identify the main types of NTM systems to be chosen for the chronosequence; (2) a field survey to identify a homogeneous set of situations for the chronosequence and (3) the characterization of the chronosequence to assess the SOC storage potential. Themain NTM system practiced by farmers is an annual succession of soybean (Glycine max) or maize (Zea mays) with another cereal crop. This cropping system covers 54% of the total cultivated area in the region. At the regional level, soil organic C concentrations from NTM fields were closely correlated with clay + silt content of the soil (r2 = 0.64). No significant correlation was observed (r2 = 0.07), however, between these two variables when we only considered the fields with a clay + silt content in the 500- 700 g kg_1 range. The final chronosequence of NTM fields was therefore based on a subsample of eight fields, within this textural range. The SOC stocks in the 0-30 cm topsoil layer of these selected fields varied between 4.2 and 6.7 kg C m_2 and increased on average (r2 = 0.97) with 0.19 kg C m_2 year_1. After 12 years of NTM management, SOC stocks were no longer significantly different from the stocks under natural Cerrado vegetation (p < 0.05), whereas a 23-year-old conventionally tilled and cropped field showed SOC stocks that were about 30% below this level. Confirming our hypotheses, this study clearly illustrated the high potential of NTM systems in increasing SOC storage under tropical conditions, and how a synchronic approach may be used to assess efficiently such modification on farmers' fields, identifying and excluding non desirable sources of heterogeneity (management, soils and climate). |
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P33 - Chimie et physique du sol F08 - Systèmes et modes de culture carbone http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_1070 |
author |
Siqueira Neto, Marcos Scopel, Eric Corbeels, Marc Cardoso, Alexandre Douzet, Jean-Marie Feller, Christian De Cassia Piccolo, Marisa Cerri, Carlos Clemente Bernoux, Martial |
author_facet |
Siqueira Neto, Marcos Scopel, Eric Corbeels, Marc Cardoso, Alexandre Douzet, Jean-Marie Feller, Christian De Cassia Piccolo, Marisa Cerri, Carlos Clemente Bernoux, Martial |
author_sort |
Siqueira Neto, Marcos |
title |
Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment |
title_short |
Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment |
title_full |
Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment |
title_fullStr |
Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment |
title_full_unstemmed |
Soil carbon stocks under no-tillage mulch-based cropping systems in the Brazilian Cerrado: An on-farm synchronic assessment |
title_sort |
soil carbon stocks under no-tillage mulch-based cropping systems in the brazilian cerrado: an on-farm synchronic assessment |
url |
http://agritrop.cirad.fr/556397/ http://agritrop.cirad.fr/556397/1/document_556397.pdf |
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