Estimate greenhouse gas emissions from water-saving and drought-resistance rice paddies by deNitrification-deComposition model

Flooded rice fields have been confirmed as a major anthropogenic source of atmospheric methane (CH 4 ). Avoiding continuous flooding is an effective practice to mitigate the CH 4 emissions originating from paddy fields. However, the contradiction between the high yield and water consumption of paddy...

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Bibliographic Details
Published in:Clean technologies and environmental policy 2022, Vol.24 (1), p.161-171
Main Authors: Zhang, Xianxian, Sun, Huifeng, Bi, Junguo, Yang, Bo, Zhang, Jining, Wang, Cong, Zhou, Sheng
Format: Article
Language:English
Subjects:
Agricultural practices
Anthropogenic factors
Carbon dioxide
Crop production
Crop yield
Crops
Cultivation
Decomposition
Denitrification
Drought
Drought resistance
Earth and Environmental Science
Emissions
Environment
Environmental Economics
Environmental Engineering/Biotechnology
Environmental policy
Farm buildings
Flood control
Flooding
Floods
Greenhouse effect
Greenhouse gases
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Methane
Mitigation
Natural disasters
Nitrous oxide
Original Paper
Resistance
Rice
Rice fields
Sustainable Development
Water conservation
Water consumption
Water quality
Water use
Water use efficiency
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Summary:Flooded rice fields have been confirmed as a major anthropogenic source of atmospheric methane (CH 4 ). Avoiding continuous flooding is an effective practice to mitigate the CH 4 emissions originating from paddy fields. However, the contradiction between the high yield and water consumption of paddy rice limits the mitigation potential of greenhouse gas (GHG) emissions through a dramatic reduction in water usage. Recently, a new rice type, water-saving and drought-resistance rice (WDR), has been developed to satisfy both the rice yield and quality with a high water use efficiency and good drought resistance. WDR can be planted under dry cultivation, similar to upland crops. A biogeochemical process model, DNDC (i.e., DeNitrification-DeComposition) was used to evaluate the effect of agricultural practices (F-R as paddy rice under flooding management and D-WDR as WDR under dry cultivation) on GHG emissions from paddy fields in Anhui Province, China. The results are as follows: 1) the DNDC model attained a good performance when simulating the rice yield, seasonal cumulative CH 4 and N 2 O emissions, and GWP; 2) the mitigation potential of the D-WDR system was higher than 90% while maintaining a high rice yield; 3) if rice paddies in Anhui can be replaced by D-WDR system, the GHG mitigation potential could reach 16.92 Mt CO 2 -eq, and the increased N 2 O emissions of the WDR system could offset a small fraction (7.6%) of the GHG radiated forcing benefit gained by the decrease in CH 4 emissions. Shifting rice production from paddy rice to WDR has a remarkable potential to balance the relationship between CH 4 mitigation and rice yield maintenance. Graphical Abstract
ISSN:1618-954X
1618-9558
DOI:10.1007/s10098-021-02094-z