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Basin-scale control on N2O loss rate and emission in the Changjiang River network, China

文献类型：期刊论文

作者Wang, Fang3; Yu, Qibiao2; Yan, Weijin3; Tian, Siyu3,4; Zhang, Peipei3,4; Wang, Jianing1
刊名FRONTIERS IN MARINE SCIENCE
出版日期2022-09-23
卷号9页码:15
关键词N2O loss rate emission mass ratio the Changjiang River network
DOI10.3389/fmars.2022.1025912
通讯作者Yan, Weijin(yanwj@igsnrr.ac.cn)
英文摘要Global riverine N2O emissions have been made by several studies with great uncertainty. However, the regional N2O budgets and patterns in large river networks is still unclear, due to the lacking understanding of in-river N2O emission rate and well-classified river network water areas. Furthermore, the mass ratio of N2O emission against nitrogen(N) load in river networks remains controversial. Here we report N2O emissions from the largest river of China, the Changjiang River network, emphasizing the basin-scale control on riverine N2O loss rate in response to increasing N loads and river size. We find the N2O emission rate is negatively related to Strahler river orders, and positively related to N loading. The velocity (V-f) of N conversion into N2O was 0.131-0.436 m yr(-1), and N2O loss rate (zeta) was 0.27-37.64 x10(-4) d(-1) and declined exponentially with water discharge. Both the loss rate and the mass ratio of N conversion into N2O varied significantly at basin scale, indicating the diminishing capacity of river ecosystems to convert excess DIN into N2O when N load increased as a direct result of human activities. Our study shows N2O emission was 0.66 Gg N2O-N (1Gg=10(9)g) in 1986 and increased to 10.3 Gg N2O-N in 2014 for the whole Changjiang River network. We identified the headwater streams are hotspots of N2O emission across the headwater stream to the estuary aquatic continuum. N2O emission was about 0.82% - 5.31% of global riverine N2O budget during 2010-2014. Our study suggested that an integrated approach in view of the riverine N loads and river hydrology is needed to improve estimates of riverine N2O emissions.
WOS关键词NITROUS-OXIDE EMISSIONS ; FRESH-WATER ; AQUATIC ECOSYSTEMS ; DISSOLVED-OXYGEN ; CARBON-DIOXIDE ; YANGTZE-RIVER ; GAS-EXCHANGE ; DENITRIFICATION ; STREAM ; CO2
资助项目National Natural Science Foundation of China ; National Key Research and Development Program of China ; Strategic Leading Science and Technology Program of the Chinese Academy of Sciences ; [41877483] ; [42077304] ; [42106214] ; [2019YFC0507805] ; [XDA20020202]
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology
语种英语
出版者FRONTIERS MEDIA SA
WOS记录号WOS:000864940000001
资助机构National Natural Science Foundation of China ; National Key Research and Development Program of China ; Strategic Leading Science and Technology Program of the Chinese Academy of Sciences
源URL[http://ir.igsnrr.ac.cn/handle/311030/185483]  
专题中国科学院地理科学与资源研究所
通讯作者Yan, Weijin
作者单位1.Chinese Acad Environm Planning, Beijing, Peoples R China
2.Xiamen Univ, Coll Environm & Ecol, Xiamen, Peoples R China
3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing, Peoples R China
4.Univ Chinese Acad Sci, Coll Resource & Environm, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Fang,Yu, Qibiao,Yan, Weijin,et al. Basin-scale control on N2O loss rate and emission in the Changjiang River network, China[J]. FRONTIERS IN MARINE SCIENCE,2022,9:15.
APA Wang, Fang,Yu, Qibiao,Yan, Weijin,Tian, Siyu,Zhang, Peipei,&Wang, Jianing.(2022).Basin-scale control on N2O loss rate and emission in the Changjiang River network, China.FRONTIERS IN MARINE SCIENCE,9,15.
MLA Wang, Fang,et al."Basin-scale control on N2O loss rate and emission in the Changjiang River network, China".FRONTIERS IN MARINE SCIENCE 9(2022):15.

入库方式： OAI收割

来源：地理科学与资源研究所

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