Simultaneous quantification of N2, NH3 and N2O emissions from a flooded paddy field under different N fertilization regimes

Xia, Longlong; Li, Xiaobo; Ma, Qianqian; Lam, Shu Kee; Wolf, Benjamin; Kiese, Ralf; Butterbach‐Bahl, Klaus; Chen, De-Li; Li, Zhian; Yan, Xiaoyuan

doi:10.1111/gcb.14958

Cited by 60 publications

(29 citation statements)

References 43 publications

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“…2. Given that rice, which is widely cultivated across China, requires N fertilization, the excessive use of N fertilizer results in sizable NH 3 emissions (Xia et al, 2020).…”

Section: Improvement Of Fertilizer-application-related Nh 3 Emission Inventoriesmentioning

confidence: 99%

Improved gridded ammonia emission inventory in China

Li¹,

Chen²,

Shen³

et al. 2021

Atmos. Chem. Phys.

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Abstract. As a major alkaline gas in the atmosphere, NH3 significantly impacts atmospheric chemistry, ecological environment, and biodiversity. Gridded NH3 emission inventories can significantly affect the accuracy of model concentrations and play a crucial role in the refinement of mitigation strategies. However, several uncertainties are still associated with existing NH3 emission inventories in China. Therefore, in this study, we focused on improving fertilizer-application-related NH3 emission inventories. We comprehensively evaluated the dates and times of fertilizer application to the major crops that are cultivated in China, improved the spatial allocation methods for NH3 emissions from croplands with different rice types, and established a gridded NH3 emission inventory for mainland China with a resolution of 5 min × 5 min in 2016. The results showed that the atmospheric NH3 emissions in mainland China amounted to 12.11 Tg, with livestock waste (44.8 %) and fertilizer application (38.6 %) being the two main NH3 emission sources in China. Obvious spatial variability in NH3 emissions was also identified, and high emissions were predominantly concentrated in North China. Further, NH3 emissions tended to be high in summer and low in winter, and the ratio for the July–January period was 3.08. Furthermore, maize and rice fertilization in summer was primarily responsible for the increase in NH3 emissions in China, and the evaluation of the spatial and temporal accuracy of the NH3 emission inventory established in this study using the WRF-Chem and ground-station- and satellite-based observations showed that it was more accurate than other inventories.

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“…2. Given that rice, which is widely cultivated across China, requires N fertilization, the excessive use of N fertilizer results in sizable NH 3 emissions (Xia et al, 2020).…”

Section: Improvement Of Fertilizer-application-related Nh 3 Emission Inventoriesmentioning

confidence: 99%

Improved gridded ammonia emission inventory in China

Li¹,

Chen²,

Shen³

et al. 2021

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…For example, there were only four observations in S agro‐region, which led to an estimated uncertainty of 28.0% in this agro‐region, which was higher than the national average (Table 1). The depth of fertilizer incorporation can significantly affect NH 3 volatilization (Xia, Li, et al, 2020). However, it was difficult to clearly distinguish the incorporation depths in this study.…”

Section: Discussionmentioning

confidence: 99%

Climate change may interact with nitrogen fertilizer management leading to different ammonia loss in China’s croplands

Ouyang

et al. 2021

Global Change Biology

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Despite research into the response of ammonia (NH3) volatilization in farmland to various meteorological factors, the potential impact of future climate change on NH3 volatilization is not fully understood. Based on a database consisting of 1063 observations across China, nonlinear NH3 models considering crop type, meteorological, soil and management variables were established via four machine learning methods, including support vector machine, multi‐layer perceptron, gradient boosting machine and random forest (RF). The RF model had the highest R2 of 0.76 and the lowest RMSE of 0.82 kg NH3‐N ha−1, showing the best simulation capability. Results of model importance indicated that NH3 volatilization was mainly controlled by total input of N fertilizer, followed by meteorological factors, human managements and soil characteristics. The NH3 emissions of China's cereal production (paddy rice, wheat and maize) in 2018 was estimated to be 3.3 Mt NH3‐N. By 2050, NH3 volatilization will increase by 23.1−32.0% under different climate change scenarios (Representative Concentration Pathways, RCPs), and climate change will have the greatest impact on NH3 volatilization in the Yangtze river agro‐region of China due to high warming effects. However, the potential increase in NH3 volatilization under future climate change can be mitigated by 26.1−47.5% through various N fertilizer management optimization options.

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“…1). For other crops, we also identified the corresponding fertilization dates and ratios according to their respective phenological periods by collecting large amounts of data from existing literatures and reports (Zhang et al, 2009; (2) Given that rice, which is widely cultivated across China, requires nitrogen fertilization, the excessive use of N fertilizer results in sizeable NH3 emissions (Xia et al, 2020). Fig.…”

Section: Improvement Of Fertilizer Application-related Nh3 Emission Inventories 90mentioning

confidence: 99%

Improved gridded ammonia emission inventory in China

Li¹,

Chen²,

Shen³

et al. 2021

Preprint

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Abstract. As a major alkaline gas in the atmosphere, NH3 significantly impacts atmospheric chemistry, ecological environment, and biodiversity. Gridded NH3 emission inventories can significantly affect the accuracy of model concentrations and play a crucial role in the refinement of mitigation strategies. However, several uncertainties are still associated with existing NH3 emission inventories in China. Therefore, in this study, we focused on improving fertilizer application-related NH3 emission inventories. We comprehensively evaluated the dates and times of fertilizer application to the major crops that are cultivated in China, improved the spatial allocation methods for NH3 emissions from croplands with different rice types, and established a gridded NH3 emission inventory for mainland China with a resolution of 5 min × 5 min in 2016. The results showed that the atmospheric NH3 emissions in mainland China amounted to 12.11 Tg, with livestock waste (44.8 %) and fertilizer application (38.6 %) being the two main NH3 emission sources in China. Obvious spatial differences in NH3 emissions were also observed, and high emissions were predominantly concentrated in North China. Further, NH3 emissions tended to be high in summer and low in winter, and the ratio for the July–January period was 3.08. Furthermore, maize and rice fertilization in summer was primarily responsible for the increase in NH3 emissions in China, and the evaluation of the spatial and temporal accuracy of the NH3 emission inventory established in this study using the WRF-Chem and ground station- and satellite-based observations showed that it was more accurate than other inventories.

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Simultaneous quantification of N₂, NH₃ and N₂O emissions from a flooded paddy field under different N fertilization regimes

Cited by 60 publications

References 43 publications

Improved gridded ammonia emission inventory in China

Improved gridded ammonia emission inventory in China

Climate change may interact with nitrogen fertilizer management leading to different ammonia loss in China’s croplands

Improved gridded ammonia emission inventory in China

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