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Nitrogen over enrichment in subtropical Pearl River estuarine coastal waters: Possible causes and consequences
Yin, KD; Harrison, PJ; k.yin@griffith.edu.au
2008
Source PublicationCONTINENTAL SHELF RESEARCH
ISSN0278-4343
Volume28Issue:12Pages:1435-1442
AbstractHong Kong is surrounded by estuarine, coastal and oceanic waters. In this study, monthly averages over a 10 year time series of salinity, temperature, chlorophyll a (chl a), dissolved oxygen (DO), dissolved inorganic nitrogen (DIN), silicate (SiO4) and orthophosphate (PO4) at three representative stations around Hong Kong were used to examine if excess nitrogen in estuarine influenced waters is due to P limitation. The monthly distribution clearly shows the dominant influence of the seasonal change in river discharge in the Pearl River estuary and adjacent coastal waters. In winter, the river discharge is small and more oceanic waters are dominant and as a result, salinity is high, and chlorophyll and nutrients are low. In summer, when the river discharge is high, salinity decreases and nutrients increase. DIN is very high, reaching 100 mu M in the estuary. This indicates over enrichment of nitrogen relative to P and consequently there is an excess of N in coastal waters of Hong Kong. P remains low (similar to 1 mu M) and can potentially limit both phytoplankton biomass and N utilization which was demonstrated in field incubation experiments. P limitation would result in excess N being left in the estuarine influenced waters south of Hong Kong. Phosphate concentration is lower in the Pearl River estuary than in many other eutrophied estuaries. Therefore, this relatively low PO4 concentration should be a significant factor limiting a further increase in the magnitude of algal biomass and in the degree of eutrophication in the Pearl River estuary. The export of the excess N offshore into the northern South China Sea may result in an increase in the size of the region that is P limited in summer. (c) 2008 Elsevier Ltd. All rights reserved.
Department[Yin, Kedong] Chinese Acad Sci, S China Sea Inst Oceanol, Key Lab Trop Marine Environm Dynam, Guangzhou, Guangdong, Peoples R China; [Yin, Kedong] Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; [Yin, Kedong; Harrison, Paul J.] Hong Kong Univ Sci & Technol, Dept Biol, Atmospher Coastal & Marine Environm Program, Kowloon, Hong Kong, Peoples R China
KeywordPearl River Estuary Eutrophication n Excess p Limitation South China Sea
Subject AreaOceanography
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Indexed Bysci
Funding ProjectLED
WOS IDWOS:000257620200005
Citation statistics
Cited Times:43[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/5991
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authork.yin@griffith.edu.au
Recommended Citation
GB/T 7714
Yin, KD,Harrison, PJ,k.yin@griffith.edu.au. Nitrogen over enrichment in subtropical Pearl River estuarine coastal waters: Possible causes and consequences[J]. CONTINENTAL SHELF RESEARCH,2008,28(12):1435-1442.
APA Yin, KD,Harrison, PJ,&k.yin@griffith.edu.au.(2008).Nitrogen over enrichment in subtropical Pearl River estuarine coastal waters: Possible causes and consequences.CONTINENTAL SHELF RESEARCH,28(12),1435-1442.
MLA Yin, KD,et al."Nitrogen over enrichment in subtropical Pearl River estuarine coastal waters: Possible causes and consequences".CONTINENTAL SHELF RESEARCH 28.12(2008):1435-1442.
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