Nitrogen and phosphorus budgets of the Changjiang River estuary

doi:10.1007/s00343-011-0505-9

	Nitrogen and phosphorus budgets of the Changjiang River estuary
	Li Xiang'an 1,2; Yu Zhiming1 ; Song Xiuxian1 ; Cao Xihua1 ; Yuan Yongquan1
	2011-07-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	29 期号:4 页码:762-774
文章类型	Article
摘要	Eutrophication has emerged as a key environmental problem in Chinese coastal waters, especially in the Changjiang (Yangtze) River estuary. In this area, large nutrient inputs result in frequent harmful algal blooms and serious hypoxia in bottom waters. Four cruises were made in the estuary in 2006 to assess the concentration and distribution of dissolved inorganic nitrogen (DIN) and phosphorus (DIP). The concentration of DIN decreased gradually in a linear relationship with salinity from the river mouth to outer waters, while DIP was relatively more dispersed. A modified box budget method was used to estimate nutrient fluxes in the estuary and its adjacent waters. Water and nutrient budgets as well as primary production and denitrification rates were estimated from the box budget model. Estimated water residence time in the estuary was about 11 d. The turbid mixing zone released 33% of DIN and 49% of DIP, while in the adjacent outer sea 17.9 mmol DIN/m(2)center dot d and 0.36 mmol DIP/m(2)center dot d were fixed. Dissolved inorganic phosphorus was imported from the deep open sea waters, supporting primary production and population growth in this zone. Net ecosystem production (NEP) was calculated at 38.2 mmol/m(2)center dot d in the outer estuary and the estimated rate (N-fixation minus denitrification) was negative (1.92 mmol/m(2)center dot d), implying that a large amount of input nitrogen was taken up by algae and recycled through denitrification in bottom water and sediment.; Eutrophication has emerged as a key environmental problem in Chinese coastal waters, especially in the Changjiang (Yangtze) River estuary. In this area, large nutrient inputs result in frequent harmful algal blooms and serious hypoxia in bottom waters. Four cruises were made in the estuary in 2006 to assess the concentration and distribution of dissolved inorganic nitrogen (DIN) and phosphorus (DIP). The concentration of DIN decreased gradually in a linear relationship with salinity from the river mouth to outer waters, while DIP was relatively more dispersed. A modified box budget method was used to estimate nutrient fluxes in the estuary and its adjacent waters. Water and nutrient budgets as well as primary production and denitrification rates were estimated from the box budget model. Estimated water residence time in the estuary was about 11 d. The turbid mixing zone released 33% of DIN and 49% of DIP, while in the adjacent outer sea 17.9 mmol DIN/m(2)center dot d and 0.36 mmol DIP/m(2)center dot d were fixed. Dissolved inorganic phosphorus was imported from the deep open sea waters, supporting primary production and population growth in this zone. Net ecosystem production (NEP) was calculated at 38.2 mmol/m(2)center dot d in the outer estuary and the estimated rate (N-fixation minus denitrification) was negative (1.92 mmol/m(2)center dot d), implying that a large amount of input nitrogen was taken up by algae and recycled through denitrification in bottom water and sediment.
关键词	Nitrogen Phosphorus Nutrients Transport Budget Model Changjiang (Yangtze) River Estuary
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1007/s00343-011-0505-9
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000292558700005
引用统计	被引频次：18[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/337002/11685
专题	海洋生态与环境科学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, 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	Li Xiang'an,Yu Zhiming,Song Xiuxian,et al. Nitrogen and phosphorus budgets of the Changjiang River estuary[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2011,29(4):762-774.
APA	Li Xiang'an,Yu Zhiming,Song Xiuxian,Cao Xihua,&Yuan Yongquan.(2011).Nitrogen and phosphorus budgets of the Changjiang River estuary.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,29(4),762-774.
MLA	Li Xiang'an,et al."Nitrogen and phosphorus budgets of the Changjiang River estuary".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 29.4(2011):762-774.

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