Development of DNDC-BC model to estimate greenhouse gas emissions from rice paddy fields under combination of biochar and controlled irrigation management.

Zewei Jiang, Shihong Yang* (Corresponding Author), Pete Smith, Mohamed Abdalla, Qingqing Pang, Xue Yin, Suting Qi

*Corresponding author for this work

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Abstract

Simulating the impacts of biochar and controlled irrigation (CI, a water26 saving irrigation technology without surface ponding of water) combination on
greenhouse gas (GHG) emissions from paddy fields is crucial, however, the original DNDC model is not capable of capturing these management impacts on emissions. In this study, we have created a new modelling approach called DNDC-Biochar Controlled Irrigation (DNDC-BC) by adding two modules to the original DNDC: the water balance principle, and the two-pool biochar model. The performance of the DNDC-BC was tested and validated using a two-year field experiment, designed with two irrigation treatments (flood irrigation (FI), and CI) and three biochar application rates (0, 20, and 40 t ha-1), carried in the Lake Taihu region, China. Results revealed that the DNDC-BC model performed satisfactorily in simulating impacts of biochar-CI combination on emissions of CH4, N2O, SOC, and grain yield. The corresponding R values of DNDC-BC increased by 22.63%-35.66%, 43.00%-71.26%, 1.06%-60.87% and 15.38%-34.78% compared with those of the original model. Sensitivity analysis for the DNDC-BC showed that CH4 emissions were most sensitive to rainfall and irrigation; N2O emissions were sensitive to rainfall, irrigation and N fertilizer application rate, and SOC was sensitive to biochar application rates. Our results suggest that the combination of biochar- and CI can save water resources and mitigate GHG emissions without detrimental impacts on rice yield. The DNDC-BC can be used to estimate the long-term impacts of biochar-CI combination on GHG emission, crop productivity and climate change.
Original languageEnglish
Article number116450
Number of pages12
JournalGeoderma
Volume433
Early online date28 Mar 2023
DOIs
Publication statusPublished - May 2023

Bibliographical note

Acknowledgments
This work was supported by the National Natural Science Foundation of China
608 (51879076), SuperG (Nr: 774124; funded under EU Horizon 2020 programme), the Fundamental Research Funds for the Central Universities (B220203009), the Postgraduate Research & Practice Program of Jiangsu Province (KYCX22_0669), the Water Conservancy Science and Technology Project of Jiangxi Province 12 (202124ZDKT09). Thanks to the late Professor Changsheng Li who provided the source code of DNDC and corresponding support. We thank the China Scholarship
Council (CSC) for providing a scholarship to Zewei Jiang.

Data Availability Statement

Data will be made available on request.

Keywords

  • Biochar
  • Controlled irrigation paddy
  • Model development
  • Rice
  • DNDC-BC
  • Greenhouse Gas Emissions

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