Assessment of the annual greenhouse gases emissions under different rice-based cropping systems in Hubei Province based on the denitrification-decomposition (DNDC) model

WU Mengqin; LI Chengfang; SHENG Feng; FENG Junheng; HU Quanyi; CHEN Yukun; ZHOU Haozhi; LIU Tianqi

doi:10.13930/j.cnki.cjea.210099

Volume 29 Issue 9

Sep. 2021

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Article Navigation > Chinese Journal of Eco-Agriculture > 2021 > 29(9): 1480-1492

WU M Q, LI C F, SHENG F, FENG J H, HU Q Y, CHEN Y K, ZHOU H Z, LIU T Q. Assessment of the annual greenhouse gases emissions under different rice-based cropping systems in Hubei Province based on the denitrification-decomposition (DNDC) model[J]. Chinese Journal of Eco-Agriculture, 2021, 29(9): 1480−1492 doi: 10.13930/j.cnki.cjea.210099

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Assessment of the annual greenhouse gases emissions under different rice-based cropping systems in Hubei Province based on the denitrification-decomposition (DNDC) model

doi: 10.13930/j.cnki.cjea.210099

1.
Key Laboratory of Crop Physiology, Ecology and Farming in the Middle Reaches of the Yangtze River, Ministry of Agriculture/College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
2.
Yangtze University/Hubei Collaborative Innovation Center for the Industrialization of Major Food Crops, Yangtze University, Jingzhou 434023, China
3.
State Key Laboratory of Biocatalysis and Enzyme Engineering Jointly Established by the Province and the Ministry/College of Life Sciences, Hubei University/ China Agricultural Carbon Emission Reduction and Carbon Trading Research Center, Hubei University, Wuhan 430062, China

Funds: This study was supported by the National Key Research and Development Project of China (2017YFD0301403), the National Natural Science Foundation of China (71871086), the Natural Science Foundation of Hubei Province (2018CFB608) and the Fundamental Research Funds for the Central Universities (2662019FW009)

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Corresponding author: E-mail: 570112975@qq.com
Received Date: 2021-02-23
Accepted Date: 2021-04-28

Available Online: 2021-07-13

Publish Date: 2021-09-06

Abstract

Abstract

This study explored the impacts of different management measures on the annual emissions of methane (CH₄) and nitrous oxide (N₂O) from the main rice-based cropping systems in Hubei Province using the denitrification-decomposition (DNDC) model and observed emission data to estimate the annual greenhouse gas emissions via a geographic information system (ArcGIS). In 2019, rice–wheat (RW) and rice–ratoon rice (RO) cropping systems were implemented in Zaoyang City of Northwest Hubei, RO and rice–oilseed rape (RR) cropping systems were implemented in Wuxue City of Southeast Hubei, and RW, RO, and RR cropping systems were implemented in Qianjiang City of the Jianghan Plain. There were two cultivation modes for each rice-based system: conventional cultivation and optimized cultivation. The optimized mode included deep application of nitrogen fertilizer, water-saving irrigation, and straw returning to the field. The annual fluxes of CH₄ and N₂O were measured using the static closed chamber method. The field validation results showed that the normalized root mean square error between the observed and simulated values of CH₄ and N₂O emissions ranged from 19.3% to 24.2% under different rice-based cropping systems with different management practices, and the degree of model fitting was acceptable. According to the simulation results of the DNDC model, the global warming potential (GWP) for the rice growing regions in Hubei Province followed the order of Jianghan Plain > Southeast Hubei > Northwest Hubei, and the annual cumulative emissions of CH₄, N₂O, and GWP under different rice-based cropping systems in different regions was in the order of RW > RO > RR. The cultivation modes significantly affected the CH₄ and N₂O emissions. Compared with conventional cultivation, optimized cultivation lowered the CH₄ emissions per unit area by 9.5%–18.0%, 7.3%–18.4%, and 18.2%–22.4% under RW, RO, and RR, respectively. The N₂O emissions lowered by 4.2%–14.2%, 6.9%–24.7%, and 8.8%–18.1%, respectively. Moreover, compared with conventional cultivation, optimized cultivation decreased the annual cumulative CH₄ emissions by 11.8%, 14.4%, and 16.3% in Northwest Hubei, Southeast Hubei, and the Jianghan Plain, respectively, and decreased the annual cumulative N₂O emissions by 82.4%, 77.5%, and 83.0%, respectively. Under optimized cultivation, the GWP for Northwest Hubei was in the order of Xiangyang > Shiyan > Shennongjia, that for Southeast Hubei was in the order Huanggang > Xianning > Wuhan > Huangshi > Ezhou, and that for the Jianghan Plain was in the order Jingzhou > Jingmen > Xiaogan > Suizhou > Tianmen > Xiantao > Qianjiang. Our results show that the DNDC model can suitably simulate the greenhouse gas emissions of different rice-based cropping systems in Hubei Province. An optimized cultivation mode is needed to mitigate greenhouse gas emissions during rice production in Hubei Province.
- Rice-based cropping system,
- Optimized cultivation,
- Denitrification-decomposition (DNDC) model,
- CH₄,
- N₂O

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References(59)

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