Soil organic carbon sequestration and mitigation potential in a rice cropland in Bangladesh

a modelling approach

K Begum, M Kuhnert, J Yeluripati, S Ogle, W Parton, M. A. Kader, P Smith

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An increase in the storage of carbon (C) in soil by changing management practices can help to mitigate climate change and increase soil quality. The objective of this study was to evaluate the best management options for reducing greenhouse gas (GHG) emissions. An ecosystem model DayCent was tested for two rice (Oryza sativa L.) experimental sites in Bangladesh. The sites are under different management practices and we first tested the models ability to simulate SOC turnover, and then estimated the potential for SOC sequestration by comparing change in SOC for each management scenario with baseline management (current farmers’ practices) including conventional tillage, 5% residue incorporation and nitrogen (N) fertilizer. Predicted yield was also compared at both sites to ensure that yield was not compromised by mitigation measures. A control treatment was tested at both sites. At site 1, two other treatments of mineral N fertilizer, and combination of farmyard manure (FYM) and N were tested in a double rice based crop rotation. At site 2, a treatment receiving cowdung (CD) application, and a combination of CD and N were tested in a wheat (Triticum aestivum L.)-rice based crop rotation. The DayCent model was able to simulate SOC increase from the double rice test sites under unfertilized conditions, considering additional N and C sources in the simulations. Assuming N fertilizer (180 kg N ha−1 yr−1) application for site 1, and CD application (25 t ha−1 yr−1) for site 2, respectively, as the baseline, four single, and one integrated, scenarios were implemented in the model to predict SOC and yield at both sites. Two additional scenarios with alternate wet and drying (AWD) as a single treatment, and as part of an integrated approach, were also tested for their mitigation potential at site 1. The highest simulated positive impact on SOC development (60% higher than that of the baseline) was observed at site 1 when FYM was used in place of mineral N fertilizer. As there is a yield penalty associated with the use of only FYM, integrated approaches might show more promise, such as inclusion of 15% residue return, reduced tillage, less mineral N fertilizer, FYM addition, with or without AWD. This approach increases SOC by up to 23% while keeping the yield stable (nearly 3.5 t ha−1). The application of CD only as determined for baseline of site 2, gives a yield of about 1.8 t ha−1 yr−1. In contrast nearly two times more yield was obtained under the scenario associated with integrated management which also increases SOC by 30% relative to the baseline at the second site. Net GHG emissions, including nitrous oxide and methane emissions were estimated using the Intergovernmental Panel on Climate Change (IPCC) tier 1 methods, and country specific emission factors (where available), suggests that the integrated management scenario can reduce the net GHG emissions from 0.58-0.82 t carbon dioxide (CO2)-eq. ha−1 yr−1 (equivalent to 0.16-0.24 t Ceq. ha−1 yr−1) at site 2, while a net reduction in GHGs of nearly 1.00 t CO2-eq. ha−1 yr−1 (equivalent to 0.27 t Ceq. ha−1 yr−1) at site 1 was only achieved if AWD was also implemented with the integrated management scenario. Future studies could attempt to model non-CO2 GHGs with a dynamic model.
Original languageEnglish
Pages (from-to)16-27
Number of pages12
JournalField Crops Research
Volume226
Early online date17 Jul 2018
DOIs
Publication statusPublished - 30 Sep 2018

Fingerprint

Bangladesh
carbon sequestration
soil organic carbon
mitigation
rice
organic carbon
nitrogen fertilizers
cattle manure
fertilizer
manure
animal manures
modeling
soil
greenhouse gas emissions
mineral fertilizers
greenhouse gas
crop rotation
drying
integrated approach
carbon dioxide

Keywords

  • carbon sequestration
  • rice
  • agricultural management
  • mitigation potential
  • Bangladesh

Cite this

Soil organic carbon sequestration and mitigation potential in a rice cropland in Bangladesh : a modelling approach. / Begum, K; Kuhnert, M; Yeluripati, J; Ogle, S; Parton, W; Kader, M. A.; Smith, P.

In: Field Crops Research, Vol. 226, 30.09.2018, p. 16-27.

Research output: Contribution to journalArticle

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title = "Soil organic carbon sequestration and mitigation potential in a rice cropland in Bangladesh: a modelling approach",
abstract = "An increase in the storage of carbon (C) in soil by changing management practices can help to mitigate climate change and increase soil quality. The objective of this study was to evaluate the best management options for reducing greenhouse gas (GHG) emissions. An ecosystem model DayCent was tested for two rice (Oryza sativa L.) experimental sites in Bangladesh. The sites are under different management practices and we first tested the models ability to simulate SOC turnover, and then estimated the potential for SOC sequestration by comparing change in SOC for each management scenario with baseline management (current farmers’ practices) including conventional tillage, 5{\%} residue incorporation and nitrogen (N) fertilizer. Predicted yield was also compared at both sites to ensure that yield was not compromised by mitigation measures. A control treatment was tested at both sites. At site 1, two other treatments of mineral N fertilizer, and combination of farmyard manure (FYM) and N were tested in a double rice based crop rotation. At site 2, a treatment receiving cowdung (CD) application, and a combination of CD and N were tested in a wheat (Triticum aestivum L.)-rice based crop rotation. The DayCent model was able to simulate SOC increase from the double rice test sites under unfertilized conditions, considering additional N and C sources in the simulations. Assuming N fertilizer (180 kg N ha−1 yr−1) application for site 1, and CD application (25 t ha−1 yr−1) for site 2, respectively, as the baseline, four single, and one integrated, scenarios were implemented in the model to predict SOC and yield at both sites. Two additional scenarios with alternate wet and drying (AWD) as a single treatment, and as part of an integrated approach, were also tested for their mitigation potential at site 1. The highest simulated positive impact on SOC development (60{\%} higher than that of the baseline) was observed at site 1 when FYM was used in place of mineral N fertilizer. As there is a yield penalty associated with the use of only FYM, integrated approaches might show more promise, such as inclusion of 15{\%} residue return, reduced tillage, less mineral N fertilizer, FYM addition, with or without AWD. This approach increases SOC by up to 23{\%} while keeping the yield stable (nearly 3.5 t ha−1). The application of CD only as determined for baseline of site 2, gives a yield of about 1.8 t ha−1 yr−1. In contrast nearly two times more yield was obtained under the scenario associated with integrated management which also increases SOC by 30{\%} relative to the baseline at the second site. Net GHG emissions, including nitrous oxide and methane emissions were estimated using the Intergovernmental Panel on Climate Change (IPCC) tier 1 methods, and country specific emission factors (where available), suggests that the integrated management scenario can reduce the net GHG emissions from 0.58-0.82 t carbon dioxide (CO2)-eq. ha−1 yr−1 (equivalent to 0.16-0.24 t Ceq. ha−1 yr−1) at site 2, while a net reduction in GHGs of nearly 1.00 t CO2-eq. ha−1 yr−1 (equivalent to 0.27 t Ceq. ha−1 yr−1) at site 1 was only achieved if AWD was also implemented with the integrated management scenario. Future studies could attempt to model non-CO2 GHGs with a dynamic model.",
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AU - Parton, W

AU - Kader, M. A.

AU - Smith, P

N1 - We are grateful to the model developers at the Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, Colorado, United States of America, for sending us the new version of DayCent model. The work was supported by Bangabandhu Fellowship on Science and ICT project, Ministry of Science and Technology, People’s Republic of Bangladesh.

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N2 - An increase in the storage of carbon (C) in soil by changing management practices can help to mitigate climate change and increase soil quality. The objective of this study was to evaluate the best management options for reducing greenhouse gas (GHG) emissions. An ecosystem model DayCent was tested for two rice (Oryza sativa L.) experimental sites in Bangladesh. The sites are under different management practices and we first tested the models ability to simulate SOC turnover, and then estimated the potential for SOC sequestration by comparing change in SOC for each management scenario with baseline management (current farmers’ practices) including conventional tillage, 5% residue incorporation and nitrogen (N) fertilizer. Predicted yield was also compared at both sites to ensure that yield was not compromised by mitigation measures. A control treatment was tested at both sites. At site 1, two other treatments of mineral N fertilizer, and combination of farmyard manure (FYM) and N were tested in a double rice based crop rotation. At site 2, a treatment receiving cowdung (CD) application, and a combination of CD and N were tested in a wheat (Triticum aestivum L.)-rice based crop rotation. The DayCent model was able to simulate SOC increase from the double rice test sites under unfertilized conditions, considering additional N and C sources in the simulations. Assuming N fertilizer (180 kg N ha−1 yr−1) application for site 1, and CD application (25 t ha−1 yr−1) for site 2, respectively, as the baseline, four single, and one integrated, scenarios were implemented in the model to predict SOC and yield at both sites. Two additional scenarios with alternate wet and drying (AWD) as a single treatment, and as part of an integrated approach, were also tested for their mitigation potential at site 1. The highest simulated positive impact on SOC development (60% higher than that of the baseline) was observed at site 1 when FYM was used in place of mineral N fertilizer. As there is a yield penalty associated with the use of only FYM, integrated approaches might show more promise, such as inclusion of 15% residue return, reduced tillage, less mineral N fertilizer, FYM addition, with or without AWD. This approach increases SOC by up to 23% while keeping the yield stable (nearly 3.5 t ha−1). The application of CD only as determined for baseline of site 2, gives a yield of about 1.8 t ha−1 yr−1. In contrast nearly two times more yield was obtained under the scenario associated with integrated management which also increases SOC by 30% relative to the baseline at the second site. Net GHG emissions, including nitrous oxide and methane emissions were estimated using the Intergovernmental Panel on Climate Change (IPCC) tier 1 methods, and country specific emission factors (where available), suggests that the integrated management scenario can reduce the net GHG emissions from 0.58-0.82 t carbon dioxide (CO2)-eq. ha−1 yr−1 (equivalent to 0.16-0.24 t Ceq. ha−1 yr−1) at site 2, while a net reduction in GHGs of nearly 1.00 t CO2-eq. ha−1 yr−1 (equivalent to 0.27 t Ceq. ha−1 yr−1) at site 1 was only achieved if AWD was also implemented with the integrated management scenario. Future studies could attempt to model non-CO2 GHGs with a dynamic model.

AB - An increase in the storage of carbon (C) in soil by changing management practices can help to mitigate climate change and increase soil quality. The objective of this study was to evaluate the best management options for reducing greenhouse gas (GHG) emissions. An ecosystem model DayCent was tested for two rice (Oryza sativa L.) experimental sites in Bangladesh. The sites are under different management practices and we first tested the models ability to simulate SOC turnover, and then estimated the potential for SOC sequestration by comparing change in SOC for each management scenario with baseline management (current farmers’ practices) including conventional tillage, 5% residue incorporation and nitrogen (N) fertilizer. Predicted yield was also compared at both sites to ensure that yield was not compromised by mitigation measures. A control treatment was tested at both sites. At site 1, two other treatments of mineral N fertilizer, and combination of farmyard manure (FYM) and N were tested in a double rice based crop rotation. At site 2, a treatment receiving cowdung (CD) application, and a combination of CD and N were tested in a wheat (Triticum aestivum L.)-rice based crop rotation. The DayCent model was able to simulate SOC increase from the double rice test sites under unfertilized conditions, considering additional N and C sources in the simulations. Assuming N fertilizer (180 kg N ha−1 yr−1) application for site 1, and CD application (25 t ha−1 yr−1) for site 2, respectively, as the baseline, four single, and one integrated, scenarios were implemented in the model to predict SOC and yield at both sites. Two additional scenarios with alternate wet and drying (AWD) as a single treatment, and as part of an integrated approach, were also tested for their mitigation potential at site 1. The highest simulated positive impact on SOC development (60% higher than that of the baseline) was observed at site 1 when FYM was used in place of mineral N fertilizer. As there is a yield penalty associated with the use of only FYM, integrated approaches might show more promise, such as inclusion of 15% residue return, reduced tillage, less mineral N fertilizer, FYM addition, with or without AWD. This approach increases SOC by up to 23% while keeping the yield stable (nearly 3.5 t ha−1). The application of CD only as determined for baseline of site 2, gives a yield of about 1.8 t ha−1 yr−1. In contrast nearly two times more yield was obtained under the scenario associated with integrated management which also increases SOC by 30% relative to the baseline at the second site. Net GHG emissions, including nitrous oxide and methane emissions were estimated using the Intergovernmental Panel on Climate Change (IPCC) tier 1 methods, and country specific emission factors (where available), suggests that the integrated management scenario can reduce the net GHG emissions from 0.58-0.82 t carbon dioxide (CO2)-eq. ha−1 yr−1 (equivalent to 0.16-0.24 t Ceq. ha−1 yr−1) at site 2, while a net reduction in GHGs of nearly 1.00 t CO2-eq. ha−1 yr−1 (equivalent to 0.27 t Ceq. ha−1 yr−1) at site 1 was only achieved if AWD was also implemented with the integrated management scenario. Future studies could attempt to model non-CO2 GHGs with a dynamic model.

KW - carbon sequestration

KW - rice

KW - agricultural management

KW - mitigation potential

KW - Bangladesh

U2 - 10.1016/j.fcr.2018.07.001

DO - 10.1016/j.fcr.2018.07.001

M3 - Article

VL - 226

SP - 16

EP - 27

JO - Field Crops Research

JF - Field Crops Research

SN - 0378-4290

ER -