SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
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
Xu, J; Ho, AYT; Yin, KD; Yuan, XC; Anderson, DM; Lee, JHW; Harrison, PJ; xujie@ust.hk
2008
Source PublicationMARINE POLLUTION BULLETIN
ISSN0025-326X
Volume57Issue:40706Pages:335-348
AbstractIn 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.
Department[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
KeywordStoichiometric Nutrient Limitation Pearl River Discharge Sewage Effluent Hong Kong Waters Monsoon
Subject AreaEnvironmental Sciences ; Marine & Freshwater Biology
Indexed Bysci
Funding ProjectLED
WOS IDWOS:000257816300016
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/5985
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorxujie@ust.hk
Recommended Citation
GB/T 7714
Xu, J,Ho, AYT,Yin, KD,et al. 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[J]. MARINE POLLUTION BULLETIN,2008,57(40706):335-348.
APA Xu, J.,Ho, AYT.,Yin, KD.,Yuan, XC.,Anderson, DM.,...&xujie@ust.hk.(2008).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,57(40706),335-348.
MLA Xu, J,et al."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 57.40706(2008):335-348.
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