Spatial-temporal variation of dissolved N-2 and denitrification in an agricultural river network, southeast China

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	Spatial-temporal variation of dissolved N-2 and denitrification in an agricultural river network, southeast China
	Chen, Nengwang ; Wu, Jiezhong ; Chen, Zhuhong ; Lu, Ting ; Wang, Longjian ; Chen NW(陈能汪)
刊名	http://dx.doi.org/10.1016/j.agee.2014.03.004
	2014-05-01
关键词	ANAEROBIC AMMONIUM OXIDATION INLET MASS-SPECTROMETRY FRESH-WATER NITROGEN REMOVAL JIULONG RIVER PLAINS RIVER SEDIMENT MARINE STREAM ECOSYSTEMS
英文摘要	National Natural Science Foundation of China [41076042, 41376082]; Fundamental Research Funds for the Central Universities [2012121053]; The spatio-temporal pattern of excess N-2 production due to denitrification and gaseous nitrogen (N) removal via N-2 emission were investigated for a large agricultural river (the Jiulong River) in southeast China. During 2010-2011, direct measurement of excess dissolved N-2 (Delta N-2, denitrification product) using the N-2:Ar ratio method was carried out along the river network (North River and West River). The results showed that Delta N-2 ranged from 24 to 71 mu mol N-2 L-1 in the West River, and from 3 to 160 mu mol N-2 L-1 in the North River. Areal mean N-2 water-air flux was 8.66 kg N ha(-1) yr(-1) for the whole river network. "Hot spots" of denitrification were found in the upper North River and lower West River, where animal/human wastes dominated the riverine N source. Dissolved inorganic nitrogen (DIN) and dissolved oxygen are the key factors controlling the spatial variation of Delta N-2. Delta N-2 generally peaked in January and during the warm-wet season from May through October, indicating an interactive effect of water temperature and DIN concentration on denitrification. Gaseous N removal fraction (E-d = 22% of [DIN]; annual N removal = 24% of riverine N export) through net denitrification is comparable with other river-estuaries around the world. Gaseous N removal effectiveness generally decreased with N enrichment and was constrained in those hyper-N rich river reaches. Management of N loss should consider the terrestrial and aquatic systems, in order to reduce N export from watershed to coast and mitigate eutrophication in this region. (C) 2014 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89940]
专题	环境生态－已发表论文
推荐引用方式 GB/T 7714	Chen, Nengwang,Wu, Jiezhong,Chen, Zhuhong,et al. Spatial-temporal variation of dissolved N-2 and denitrification in an agricultural river network, southeast China[J]. http://dx.doi.org/10.1016/j.agee.2014.03.004,2014.
APA	Chen, Nengwang,Wu, Jiezhong,Chen, Zhuhong,Lu, Ting,Wang, Longjian,&陈能汪.(2014).Spatial-temporal variation of dissolved N-2 and denitrification in an agricultural river network, southeast China.http://dx.doi.org/10.1016/j.agee.2014.03.004.
MLA	Chen, Nengwang,et al."Spatial-temporal variation of dissolved N-2 and denitrification in an agricultural river network, southeast China".http://dx.doi.org/10.1016/j.agee.2014.03.004 (2014).