Direct measurement of dissolved N2 and denitrification along a subtropical river-estuary gradient, China

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	Direct measurement of dissolved N2 and denitrification along a subtropical river-estuary gradient, China
	Wu, Jiezhong ; Chen, Nengwan ; Hong, Huashen ; Lu, Ting ; Wang, Longjian ; Chen, Zhuhong ; Chen NW(陈能汪) ; Hong HS(洪华生)
刊名	http://dx.doi.org/10.1016/j.marpolbul.2012.10.020
	2013-01-15
关键词	Denitrification Estuaries Mixing Rivers Water
英文摘要	The spatial pattern and seasonal variation of denitrification were investigated during 2010-2011 in the Jiulong River Estuary (JRE) in southeast China. Dissolved N2 was directly measured by changes in the N2:Ar ratio. The results showed that excess dissolved N2 ranged from -9.9 to 76.4μmolL-1. Tidal mixing leads to a seaward decline of dissolved gaseous concentrations and water-air fluxes along the river-estuary gradient. Denitrification at freshwater sites varied between seasons, associated with changes in N input and water temperature. The denitrification process was controlled by the nitrate level at freshwater sites, and the excess dissolved N2 observed at the tidal zone largely originated from upstream water transport. Compared to other estuaries, JRE has a relative low gaseous removal efficiency (Ed=12% of [DIN]; annual N removal=24% of DIN load), a fact ascribed to strong tidal mixing, coarse-textured sediment with shallow depth before bedrock and high riverine DIN input. ? 2012 Elsevier Ltd.
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89931]
专题	环境生态－已发表论文
推荐引用方式 GB/T 7714	Wu, Jiezhong,Chen, Nengwan,Hong, Huashen,et al. Direct measurement of dissolved N2 and denitrification along a subtropical river-estuary gradient, China[J]. http://dx.doi.org/10.1016/j.marpolbul.2012.10.020,2013.
APA	Wu, Jiezhong.,Chen, Nengwan.,Hong, Huashen.,Lu, Ting.,Wang, Longjian.,...&洪华生.(2013).Direct measurement of dissolved N2 and denitrification along a subtropical river-estuary gradient, China.http://dx.doi.org/10.1016/j.marpolbul.2012.10.020.
MLA	Wu, Jiezhong,et al."Direct measurement of dissolved N2 and denitrification along a subtropical river-estuary gradient, China".http://dx.doi.org/10.1016/j.marpolbul.2012.10.020 (2013).