The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China

doi:10.1016/j.ecss.2009.09.017

	The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China
	Liu, Xiujuan1,2 ; Yu, Zhiming1 ; Song, Xiuxian1 ; Cao, Xihua1
	2009-12-15
发表期刊	ESTUARINE COASTAL AND SHELF SCIENCE
ISSN	0272-7714
卷号	85 期号:4 页码:641-650
文章类型	Article
摘要	The nitrogen isotopic composition of dissolved nitrate (delta(15)N-NO(3)(-)) in surface water of the Yangtze River estuary was determined in four seasons of 2006. delta(15)N-NO(3)(-) ranged from 0.4 parts per thousand to 6.5 parts per thousand and varied with seasons and geographic regions, reflecting the dynamics of nitrogen cycling in the estuarine ecosystem. delta(15)N-NO(3)(-) was markedly lower in February than in other seasons and exhibited conservative mixing, which was probably attributed to the NO(3)(-) being sourced from the atmospheric deposition and agricultural fertilizer. In the upper estuary, the influence of riverine inputs was important during all surveys. in the turbidity maximum zone, nitrification was found with nitrate depleted in (15)N in May, whereas denitrification resulting in heavy delta(15)N-NO(3)(-) played an important role in August. More enriched delta(15)N-NO(3)(-) values coinciding with losses of nitrate concentrations based on the conservative mixing model were found in the adjacent marine area in May, and may reflect obvious phytoplankton assimilation of dissolved nitrate. In this manner, delta(15)N-NO(3)(-) may be a sensitive indicator of nitrogen sources and biogeochemical processing existing in this estuary in conjunction with the variations of dissolved nitrate and other environmental factors. (C) 2009 Elsevier Ltd. All rights reserved.; The nitrogen isotopic composition of dissolved nitrate (delta N-15-NO3-) in surface water of the Yangtze River estuary was determined in four seasons of 2006. delta N-15-NO3- ranged from 0.4 parts per thousand to 6.5 parts per thousand and varied with seasons and geographic regions, reflecting the dynamics of nitrogen cycling in the estuarine ecosystem. delta N-15-NO3- was markedly lower in February than in other seasons and exhibited conservative mixing, which was probably attributed to the NO3- being sourced from the atmospheric deposition and agricultural fertilizer. In the upper estuary, the influence of riverine inputs was important during all surveys. in the turbidity maximum zone, nitrification was found with nitrate depleted in N-15 in May, whereas denitrification resulting in heavy delta N-15-NO3- played an important role in August. More enriched delta N-15-NO3- values coinciding with losses of nitrate concentrations based on the conservative mixing model were found in the adjacent marine area in May, and may reflect obvious phytoplankton assimilation of dissolved nitrate. In this manner, delta N-15-NO3- may be a sensitive indicator of nitrogen sources and biogeochemical processing existing in this estuary in conjunction with the variations of dissolved nitrate and other environmental factors. (C) 2009 Elsevier Ltd. All rights reserved.
关键词	Nitrogen Isotopes Surface Water Seasonal Variations Biogeochemical Processing Nitrogen Cycle China Shanghai Yangtze River Estuary
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1016/j.ecss.2009.09.017
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000272957600016
引用统计	被引频次：41[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/2620
专题	海洋生态与环境科学重点实验室文献信息中心
作者单位	1.Chinese Acad Sci, Key Lab Marine Ecol & Environm Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Liu, Xiujuan,Yu, Zhiming,Song, Xiuxian,et al. The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China[J]. ESTUARINE COASTAL AND SHELF SCIENCE,2009,85(4):641-650.
APA	Liu, Xiujuan,Yu, Zhiming,Song, Xiuxian,&Cao, Xihua.(2009).The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China.ESTUARINE COASTAL AND SHELF SCIENCE,85(4),641-650.
MLA	Liu, Xiujuan,et al."The nitrogen isotopic composition of dissolved nitrate in the Yangtze River (Changjiang) estuary, China".ESTUARINE COASTAL AND SHELF SCIENCE 85.4(2009):641-650.

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