A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics
Xu, J; Yin, K; Liu, H; Lee, JHW; Anderson, DM; Ho, AYT; Harrison, PJ
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
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
关键词Eutrophication Nutrients Phytoplankton Biomass Dissolved Oxygen Sewage Stratification Hydrodynamics Light Limitation Tolo Harbour
学科领域Geosciences, Multidisciplinary ; Marine & Freshwater Biology ; Oceanography
GB/T 7714
Xu, J,Yin, K,Liu, H,et al. A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics[J]. JOURNAL OF MARINE SYSTEMS,2010,83(40606):276-286.
APA Xu, J.,Yin, K.,Liu, H.,Lee, JHW.,Anderson, DM.,...&Harrison, PJ.(2010).A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics.JOURNAL OF MARINE SYSTEMS,83(40606),276-286.
MLA Xu, J,et al."A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics".JOURNAL OF MARINE SYSTEMS 83.40606(2010):276-286.
文件名称/大小 文献类型 版本类型 开放类型 使用许可
A comparison of eutr(1109KB) 开放获取--请求全文
所有评论 (0)