A comparison of eutrophication impacts in two harbours in Hong Kong with different hydrodynamics

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	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
刊名	JOURNAL OF MARINE SYSTEMS
	2010
卷号	83 期号:40606 页码:276-286
关键词	Eutrophication Nutrients Phytoplankton biomass Dissolved oxygen Sewage Stratification Hydrodynamics Light limitation Tolo Harbour
ISSN号	0924-7963
中文摘要	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
学科主题	Geosciences, Multidisciplinary; Marine & Freshwater Biology; Oceanography
收录类别	SCI
原文出处	ELSEVIER SCIENCE BV
公开日期	2011-07-03
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/6193]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 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.