DOI: 10.1111/gcb.13351
论文题名: Modeling nitrous oxide emission from rivers: a global assessment
作者: Hu M. ; Chen D. ; Dahlgren R.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 11 起始页码: 3566
结束页码: 3582
语种: 英语
英文关键词: denitrification
; global warming
; greenhouse gases
; nitrification
; nitrous oxide
; nitrous oxide emission factor
Scopus关键词: denitrification
; ecosystem modeling
; emission
; global warming
; greenhouse gas
; nitrification
; nitrous oxide
; river system
; carbon
; nitrogen
; nitrous oxide
; meta analysis
; river
; theoretical model
; Carbon
; Models, Theoretical
; Nitrogen
; Nitrous Oxide
; Rivers
英文摘要: Estimates of global riverine nitrous oxide (N2O) emissions contain great uncertainty. We conducted a meta-analysis incorporating 169 observations from published literature to estimate global riverine N2O emission rates and emission factors. Riverine N2O flux was significantly correlated with NH4, NO3 and DIN (NH4 + NO3) concentrations, loads and yields. The emission factors EF(a) (i.e., the ratio of N2O emission rate and DIN load) and EF(b) (i.e., the ratio of N2O and DIN concentrations) values were comparable and showed negative correlations with nitrogen concentration, load and yield and water discharge, but positive correlations with the dissolved organic carbon : DIN ratio. After individually evaluating 82 potential regression models based on EF(a) or EF(b) for global, temperate zone and subtropical zone datasets, a power function of DIN yield multiplied by watershed area was determined to provide the best fit between modeled and observed riverine N2O emission rates (EF(a): R2 = 0.92 for both global and climatic zone models, n = 70; EF(b): R2 = 0.91 for global model and R2 = 0.90 for climatic zone models, n = 70). Using recent estimates of DIN loads for 6400 rivers, models estimated global riverine N2O emission rates of 29.6–35.3 (mean = 32.2) Gg N2O–N yr−1 and emission factors of 0.16–0.19% (mean = 0.17%). Global riverine N2O emission rates are forecasted to increase by 35%, 25%, 18% and 3% in 2050 compared to the 2000s under the Millennium Ecosystem Assessment's Global Orchestration, Order from Strength, Technogarden, and Adapting Mosaic scenarios, respectively. Previous studies may overestimate global riverine N2O emission rates (300–2100 Gg N2O–N yr−1) because they ignore declining emission factor values with increasing nitrogen levels and channel size, as well as neglect differences in emission factors corresponding to different nitrogen forms. Riverine N2O emission estimates will be further enhanced through refining emission factor estimates, extending measurements longitudinally along entire river networks and improving estimates of global riverine nitrogen loads. © 2016 John Wiley & Sons Ltd 资助项目: We thank Dr. Michelle L. McCrackin for providing detailed data on riverine DIN loads for 6400 global rivers from the NEWS2-DIN-S model. This work was supported by the National Natural Science Foundation of China (41371010) and the Fundamental Research Funds for the Central Universities (2016QNA6006).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61255
Appears in Collections: 影响、适应和脆弱性
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作者单位: College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, China; Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, Zhejiang University, Hangzhou, China; Ministry of Education Key Laboratory of Environment Remediation and Ecological Health, Zhejiang University, Hangzhou, China; Department of Land, Air, and Water Resources, University of California, Davis, CA, United States
Recommended Citation:
Hu M.,Chen D.,Dahlgren R.A.. Modeling nitrous oxide emission from rivers: a global assessment[J]. Global Change Biology,2016-01-01,22(11)