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学科主题: Environmental Sciences; Marine & Freshwater Biology
题名: Seasonal and spatial dynamics of nutrients and phytoplankton biomass in Victoria Harbour and its vicinity before and after sewage abatement
作者: Ho, AYT ; Xu, J ; Yin, KD ; Yuan, XC ; He, L ; Jiang, YL ; Lee, JHW ; Anderson, DM ; Harrison, PJ
通讯作者: alvinho73@gmail.com
关键词: Hong Kong ; Pearl River ; nutrients ; phytoplankton biomass ; eutrophication ; sewage treatment
刊名: MARINE POLLUTION BULLETIN
发表日期: 2008
卷: 57, 期:40706, 页:313-324
收录类别: sci
部门归属: [Ho, Alvin Y. T.; Xu, Jie; Yin, Kedong; Yuan, Xiangcheng; He, Lei; Jiang, Yuelu; Harrison, Paul J.] Hong Kong Univ Sci & Technol, Atmospher Marine & Coastal Environm AMCE Program, Kowloon, Hong Kong, Peoples R China; [Lee, Joseph H. W.] Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China; [Anderson, Donald M.] Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA; [Yin, Kedong] Griffith Univ, Australian Rivers Inst, Nathan, Qld 4111, Australia; [Yuan, Xiangcheng; He, Lei] CAS, LED, S China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
项目归属: LED
摘要: This study investigated the seasonal and spatial dynamics of nutrients and phytoplankton biomass at 12 stations in Hong Kong (HK) waters during a three year period from 2004 to 2006 after upgraded sewage treatment and compared these results to observations before sewage treatment. Pearl River estuary (PRE) discharge significantly increased NO3 and SiO4 concentrations, particularly in western and southern waters when rainfall and river discharge was maximal in summer. Continuous year round discharge of sewage effluent resulted in high NH4 and PO4 in Victoria Harbour (VH) and its vicinity. In winter, spring and fall, the water column at all stations was moderately mixed by winds and tidal currents, and phytoplankton biomass was relatively low compared to summer. In summer, the mean surface phytoplankton chl biomass was generally > 9 mu g L-1 in most areas as a result of thermohaline stratification, and high nutrients, light, and water temperature. In summer, the potential limiting nutrient is PO4 in the most productive southern waters and it seldom decreased to limiting levels (similar to 0.1 mu M), suggesting that phytoplankton growth may be only episodically limiting. The mean bottom dissolved oxygen (DO) remained > 3.5 mg L-1 at most stations, indicating that the eutrophication impact in HK waters was not as severe as expected for such a eutrophic area. After the implementation of chemically enhanced primary sewage treatment in 2001, water quality in VH improved as indicated by a significant decrease in NH4 and PO4 and an increase in bottom DO. In contrast, there were an increase in chl a and NO3, and a significant decrease in bottom DO in southern waters in summer, suggesting that hypoxic events are most likely to occur in this region if phytoplankton biomass and oxygen consumption keep increasing and exceed the buffering capacity of HK waters maintained by monsoon winds, tidal mixing and zooplankton grazing. Therefore, future studies on the long-term changes in nutrient loading from PRE and HK sewage discharge will be crucial for developing future strategies of sewage management in HK waters. (c) 2008 Elsevier Ltd. All rights reserved.
WOS记录号: WOS:000257816300014
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5983
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Ho, AYT; Xu, J; Yin, KD; Yuan, XC; He, L; Jiang, YL; Lee, JHW; Anderson, DM; Harrison, PJ.Seasonal and spatial dynamics of nutrients and phytoplankton biomass in Victoria Harbour and its vicinity before and after sewage abatement,MARINE POLLUTION BULLETIN,2008,57(40706):313-324
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