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学科主题: Geosciences, Multidisciplinary; Marine & Freshwater Biology; Oceanography
题名: A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics
作者: Xu, J ; Yin, K ; Liu, H ; Lee, JHW ; Anderson, DM ; Ho, AYT ; Harrison, PJ
关键词: Eutrophication ; Nutrients ; Phytoplankton biomass ; Dissolved oxygen ; Sewage ; Stratification ; Hydrodynamics ; Light limitation ; Tolo Harbour
刊名: JOURNAL OF MARINE SYSTEMS
发表日期: 2010-01-01
卷: 83, 期:40606, 页:276-286
收录类别: sci
部门归属: [Xu, J.; Liu, H.; Ho, A. Y. T.; Harrison, P. J.] Hong Kong Univ Sci & Technol, Div Environm, Hong Kong, Hong Kong, Peoples R China; [Yin, K.] Griffith Univ, Australian Rivers Inst, Brisbane, Qld 4111, Australia; [Lee, J. H. W.] Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China; [Yin, K.] CAS, LED S China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Anderson, D. M.] Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA
项目归属: LED
摘要: Eutrophication impacts may vary spatially and temporally due to different physical processes Using a 22 year time series data set (1986-2007) a comparison was made of eutrophication impacts between the two harbours with very different hydrodynamic conditions Victoria Harbour (Victoria) receives sewage effluent and therefore nutrients are abundant. In the highly-flushed Victoria the highest monthly average Chl a (13 mu g L-1) occurred during the period of strongest stratification in summer as a result of rainfall runoff and the input of the nutrient-rich Pearl River estuarine waters but the high flushing rate restricted nutrient utilization and further accumulation of algal biomass In other seasons vertical mixing induced light limitation and horizontal dilution led to low Chl a (<2 mu g L-1) and no spring bloom Few hypoxic events (DO<2 mg L-1) occurred due to re-aeration and limited accumulation at depth due to flushing and vertical mixing Therefore Victoria is resilient to nutrient enrichment. In contrast in the weakly-flushed Tolo Harbour (Tolo) year long stratification long residence times and weak tidal currents favored algal growth resulting in a spring diatom bloom and high Chl a (10-30 mu g L-1) all year and frequent hypoxic events in summer Hence Tolo is susceptible to nutrient enrichment and responded to nutrient reduction after sewage diversion in 1997 Sewage diversion from Tolo resulted in a 32-38% decrease in algal biomass in Tolo but not in Victoria There has been a significant increase (11-22%) in bottom DO in both harbours Our findings demonstrate that an understanding of the role of physical processes is critical in order to predict the effectiveness of sewage management strategies in reducing eutrophication impacts (C) 2010 Elsevier BV All rights reserved
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/6193
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Xu, J; Yin, K; Liu, H; Lee, JHW; Anderson, DM; Ho, AYT; Harrison, PJ.A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics,JOURNAL OF MARINE SYSTEMS,2010,83(40606):276-286
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