Direct measurement of dissolved N-2 and denitrification along a subtropical river-estuary gradient, China

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	Direct measurement of dissolved N-2 and denitrification along a subtropical river-estuary gradient, China
	Wu, Jiezhong ; Chen, Nengwang ; Hong, Huasheng ; 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
关键词	COASTAL MARINE ECOSYSTEMS NITROUS-OXIDE PRODUCTION INLET MASS-SPECTROMETRY FRESH-WATER NITRATE REDUCTION SEDIMENTS NITRIFICATION SYSTEM BAY SEAWATER
英文摘要	National Natural Science Foundation of China [41076042, 40810069004]; The spatial pattern and seasonal variation of denitrification were investigated during 2010-2011 in the Jiulong River Estuary (JRE) in southeast China. Dissolved N-2 was directly measured by changes in the N-2:Ar ratio. The results showed that excess dissolved N-2 ranged from -9.9 to 76.4 mu mol L-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 N-2 observed at the tidal zone largely originated from upstream water transport. Compared to other estuaries, JRE has a relative low gaseous removal efficiency (E-d = 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. (C) 2012 Elsevier Ltd. All rights reserved.
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/89924]
专题	环境生态－已发表论文
推荐引用方式 GB/T 7714	Wu, Jiezhong,Chen, Nengwang,Hong, Huasheng,et al. Direct measurement of dissolved N-2 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, Nengwang.,Hong, Huasheng.,Lu, Ting.,Wang, Longjian.,...&洪华生.(2013).Direct measurement of dissolved N-2 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 N-2 and denitrification along a subtropical river-estuary gradient, China".http://dx.doi.org/10.1016/j.marpolbul.2012.10.020 (2013).