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学科主题: Environmental Sciences; Marine & Freshwater Biology
题名: Temporal and spatial variations in nutrient stoichiometry and regulation of phytoplankton biomass in Hong Kong, waters: Influence of the Pearl River outflow and sewage inputs
作者: Xu, J ; Ho, AYT ; Yin, KD ; Yuan, XC ; Anderson, DM ; Lee, JHW ; Harrison, PJ
通讯作者: xujie@ust.hk
关键词: stoichiometric nutrient limitation ; Pearl River discharge ; sewage effluent ; Hong kong waters ; monsoon
刊名: MARINE POLLUTION BULLETIN
发表日期: 2008
卷: 57, 期:40706, 页:335-348
收录类别: sci
部门归属: [Xu, Jie; Ho, Alvin Y. T.; Yuan, Xiangcheng; Harrison, Paul J.] Hong Kong Univ Sci & Technol, Atmospher Marine & Coastal Environm AMCE Program, Kowloon, Hong Kong, Peoples R China; [Yin, Kedong] Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; [Anderson, Donald M.] Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA; [Lee, Joseph H. W.] Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China; [Yin, Kedong] CAS, Key Lab Trop Marine Environm Dynam, S China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
项目归属: LED
摘要: In 2001, the Hong Kong government implemented the Harbor Area Treatment Scheme (HATS) under which 70% Of the sewage that had been formerly discharged into Victoria Harbor is now collected and sent to Stonecutters Island Sewage Works where it receives chemically enhanced primary treatment (CEPT), and is then discharged into waters west of the Harbor. The relocation of the sewage discharge will possibly change the nutrient dynamics and phytoplankton biomass in this area. Therefore, there is a need to examine the factors that regulate phytoplankton growth in Hong Kong waters in order to understand future impacts. Based on a historic nutrient data set (1986-2001), a comparison of ambient nutrient ratios with the Redfield ratio (N:P:Si = 16:1:16) showed clear spatial variations in the factors that regulate phytoplankton biomass along a west (estuary) to east (coastal/oceanic) transect through Hong Kong waters. Algal biomass was constrained by a combination of low light conditions, a rapid change in salinity, and strong turbulent mixing in western waters throughout the year. Potential stoichiometric Si limitation (up to 94%) of the cases in winter) occurred in Victoria Harbor due to the contribution of sewage effluent with high N and P enrichment all year, except for summer when the frequency of stoichiometric Si limitation (48%) was the same as P, owing to the influence of the high Si in the Pearl River discharge. In the eastern waters, potential N limitation and N and P co-limitation occurred in autumn and winter respectively, because of the dominance of coastal/oceanic water with low nutrients and low N:P ratios. In contrast, potential Si limitation occurred in spring and a switch to potential N, P and Si limitation occurred in eastern waters in summer. In southern waters, there was a shift from P limitation (80%) in summer due to the influence of the N-rich Pearl River discharge, to N limitation (68%) in autumn, and to N and P co-limitation in winter due to the dominance of N-poor oceanic water from the oligotrophic South China Sea. Our results show clear temporal and spatial variations in the nutrient stoichiometry which indicates potential regulation of phytoplankton biomass in HK waters due to the combination of the seasonal exchange of the Pearl River discharge and oceanic water, sewage effluent inputs, and strong hydrodynamic mixing from SW monsoon winds in slimmer and the NE monsoon winds in winter. (c) 2008 Elsevier Ltd. All rights reserved.
WOS记录号: WOS:000257816300016
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5985
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Recommended Citation:
Xu, J; Ho, AYT; Yin, KD; Yuan, XC; Anderson, DM; Lee, JHW; Harrison, PJ.Temporal and spatial variations in nutrient stoichiometry and regulation of phytoplankton biomass in Hong Kong, waters: Influence of the Pearl River outflow and sewage inputs,MARINE POLLUTION BULLETIN,2008,57(40706):335-348
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