Atmospheric N Deposition Significantly Enhanced Soil N<sub>2</sub>O Emission From Eastern China Forests

Cen, Xiaoyu; Li, Mingxu; Xu, Li; Zhu, Jun; He, Nianpeng

doi:10.1029/2021gb007289

Cited by 9 publications

(4 citation statements)

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“…S8 ). Previous studies based on a meta‐analysis [ 44 ], a conceptual model [ 29 ], and an ensemble of terrestrial biosphere model showed that atmospheric N deposition enhances natural soil N 2 O emissions [ 45 ], which was consistent with our results. Apart from the effect of atmospheric N deposition, climate change leaded to an increase of 1.6 Gg N 2 O yr −1 for soil N 2 O emissions ( Fig.…”

Section: Discussionsupporting

confidence: 92%

“…Apart from the autotrophic nitrification and denitrifier denitrification considered in the DyN-LPJ model, the IBIS-MicN model included additional N 2 O-producing processes of heterotrophic nitrification and nitrifier denitrification [ 24 ], therefore, the IBIS-MicN model performed with a much smaller inter-annual variability. Both natural N 2 O emissions from forests and grasslands in this study are within the range of previous reports using the direct extrapolation method [ 25–28 ], linear models [ 29 ], random forest regression model [ 30 ], or process-based models [ 31 , 32 ].…”

Section: Discussionsupporting

confidence: 83%

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Four decades of full-scale nitrous oxide emission inventory in China

Liang,

Zhou,

Ren

et al. 2023

National Science Review

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China is among the top nitrous oxide (N2O)-emitting countries, but existing national inventories do not provide full-scale emissions including both natural and anthropogenic sources. We conducted a four-decade (1980–2020) of comprehensive quantification of Chinese N2O inventory using empirical emission factor method for anthropogenic sources and two up-to-date process-based models for natural sources. Total N2O emissions peaked at 2287.4 (1774.8–2799.9) Gg N2O yr−1 in 2018, and agriculture-developed regions, like the East, Northeast, and Central, were the top N2O-emitting regions. Agricultural N2O emissions have started to decrease after 2016 due to the decline of nitrogen fertilization applications, while, industrial and energetic sources have been dramatically increasing after 2005. N2O emissions from agriculture, industry, energy, and waste represented 49.3%, 26.4%, 17.5%, and 6.7% of the anthropogenic emissions in 2020, respectively, which revealed that it is imperative to prioritize N2O emission mitigation in agriculture, industry, and energy. Natural N2O sources, dominated by forests, have been steadily growing from 317.3 (290.3–344.1) Gg N2O yr−1 in 1980 to 376.2 (335.5–407.2) Gg N2O yr−1 in 2020. Our study produces a Full-scale Annual N2O dataset in China (FAN2020), providing emergent counting to refine the current national N2O inventories.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 83%

Four decades of full-scale nitrous oxide emission inventory in China

Liang,

Zhou,

Ren

et al. 2023

National Science Review

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“…It is important to note that maximizing soil CH 4 uptake might suggest maintaining a relatively high N deposition level around the transition point between Stage I and Stage II. However, this approach should consider the potential acceleration of N 2 O emissions resulting from N deposition (Cen et al., 2022). Further research is required to evaluate whether maintaining a relatively high N deposition rate can effectively reduce the gross greenhouse gas emissions.…”

Section: Discussionmentioning

confidence: 99%

Suppression of Nitrogen Deposition on Global Forest Soil CH₄ Uptake Depends on Nitrogen Status

Cen,

He,

et al. 2024

Global Biogeochemical Cycles

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Methane (CH4) is the second most important atmospheric greenhouse gas (GHG) and forest soils are a significant sink for atmospheric CH4. Uptake of CH4 by global forest soils is affected by nitrogen (N) deposition; clarifying the effect of N deposition helps to reduce uncertainties of the global CH4 budget. However, it remains an unsolved puzzle why N input stimulates soil CH4 uptake in some forests while suppressing it in others. Combining previous findings and data from N addition experiments conducted in global forests, we proposed and tested a “stimulating‐suppressing‐weakened effect” (“three stages”) hypothesis on the changing responses of soil CH4 flux (RCH4) to N input. Specifically, we calculated the response factors (f) of RCH4 to N input for N‐limited and N‐saturated forests across biomes; the phased changes in f values supported our hypothesis. We also estimated the global forest soil CH4 uptake budget to be approximately 11.2 Tg yr−1. CH4 uptake hotspots were predominantly located in temperate forests. Furthermore, we quantified that the current level of N deposition reduced global forest soil CH4 uptake by ∼3%. This suppression effect was more pronounced in temperate forests than in tropical or boreal forests, likely due to differences in N status. The proposed “three stages” hypothesis in this study generalizes the diverse effects of N input on RCH4, which could help improve experimental design. Additionally, our findings imply that by regulating N pollution and reducing N deposition, soil CH4 uptake can be significantly increased in the N‐saturated forests in tropical and temperate biomes.

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“…However, this approach should consider the potential acceleration of N 2 O emissions resulting from N deposition (Cen et al, 2022). Further research is required to evaluate whether maintaining a relatively high N deposition rate can effectively reduce combined greenhouse gas emissions from soils.…”

Section: Suppressing Effect Of N Deposition On Global Soil Ch 4 Uptak...mentioning

confidence: 99%

Suppression of nitrogen deposition on global forest soil CH4 uptake depends on nitrogen status

Cen,

He,

et al. 2024

Preprint

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Methane (CH4) is the second most important atmospheric greenhouse gas (GHG) and forest soils are a significant sink for atmospheric CH4. Uptake of CH4 by global forest soils is affected by nitrogen (N) deposition; clarifying the effect of N deposition helps to reduce uncertainties of the global CH4 budget. However, it remains an unsolved puzzle why N input stimulates soil CH4 flux (RCH4) in some forests while suppressing it in others. Combining previous findings and data from N addition experiments conducted in global forests, we proposed and tested a “stimulating-suppressing-weakening effect” (“three stages”) hypothesis on the changing responses of RCH4 to N input. Specifically, we calculated the response factors (f) of RCH4 to N input for N-limited and N-saturated forests across biomes; the significant changes in f values supported our hypothesis. We also estimated the global forest soil CH4 uptake budget to be approximately 11.2 Tg yr–1. CH4 uptake hotspots were located predominantly in temperate forests. Furthermore, we quantified that current level of N deposition reduced global forest soil CH4 uptake by ~3%. This suppression effect was more pronounced in temperate forests than in tropical or boreal forests, likely due to differences in N status. The proposed “three stages” hypothesis in this study generalizes the diverse effects of N input on RCH4, which could help improve experimental design. Additionally, our findings imply that by regulating N pollution and reducing N deposition, soil CH4 uptake can be significantly increased in the N-saturated forests in tropical and temperate biomes.

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Atmospheric N Deposition Significantly Enhanced Soil N₂O Emission From Eastern China Forests

Cited by 9 publications

References 102 publications

Four decades of full-scale nitrous oxide emission inventory in China

Four decades of full-scale nitrous oxide emission inventory in China

Suppression of Nitrogen Deposition on Global Forest Soil CH₄ Uptake Depends on Nitrogen Status

Suppression of nitrogen deposition on global forest soil CH4 uptake depends on nitrogen status

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Atmospheric N Deposition Significantly Enhanced Soil N2O Emission From Eastern China Forests

Cited by 9 publications

References 102 publications

Four decades of full-scale nitrous oxide emission inventory in China

Four decades of full-scale nitrous oxide emission inventory in China

Suppression of Nitrogen Deposition on Global Forest Soil CH4 Uptake Depends on Nitrogen Status

Suppression of nitrogen deposition on global forest soil CH4 uptake depends on nitrogen status

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Atmospheric N Deposition Significantly Enhanced Soil N₂O Emission From Eastern China Forests

Suppression of Nitrogen Deposition on Global Forest Soil CH₄ Uptake Depends on Nitrogen Status