Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong
文献类型：期刊论文
| 作者 | Xu, J ; Yin, KD ; Lee, JHW ; Liu, HB ; Ho, AYT ; Yuan, XC ; Harrison, PJ |
| 刊名 | ESTUARIES AND COASTS
 |
| 出版日期 | 2010 |
| 卷号 | 33期号:2页码:399-416 |
| ISSN号 | 1559-2723 |
| 关键词 | Eutrophication Nutrients Phytoplankton biomass Dissolved oxygen Sewage Hong Kong Deep Bay |
| 通讯作者 | xujie@ust.hk |
| 中文摘要 | Deep Bay is a semienclosed bay that receives sewage from Shenzhen, a fast-growing city in China. NH4 is the main N component of the sewage (> 50% of total N) in the inner bay, and a twofold increase in NH4 and PO4 concentrations is attributed to increased sewage loading over the 21-year period (1986-2006). During this time series, the maximum annual average NH4 and PO4 concentrations exceeded 500 and 39 mu M, respectively. The inner bay (Stns DM1 and DM2) has a long residence time and very high nutrient loads and yet much lower phytoplankton biomass (chlorophyll (Chl) < 10 mu g L-1 except for Jan, July, and Aug) and few severe long-term hypoxic events (dissolved oxygen (DO) generally > 2 mg L-1) than expected. Because it is shallow (similar to 2 m), phytoplankton growth is likely limited by light due to mixing and suspended sediments, as well as by ammonium toxicity, and biomass accumulation is reduced by grazing, which may reduce the occurrence of hypoxia. Since nutrients were not limiting in the inner bay, the significant long-term increase in Chl a (0.52-0.57 mu g L-1 year(-1)) was attributed to climatic effects in which the significant increase in rainfall (11 mm year(-1)) decreased salinity, increased stratification, and improved water stability. The outer bay (DM3 to DM5) has a high flushing rate (0.2 day(-1)), is deeper (3 to 5 m), and has summer stratification, yet there are few large algal blooms and hypoxic events since dilution by the Pearl River discharge in summer, and the invasion of coastal water in winter is likely greater than the phytoplankton growth rate. A significant long-term increase in NO3 (0.45-0.94 mu M year(-1)) occurred in the outer bay, but no increasing trend was observed for SiO4 or PO4, and these long-term trends in NO3, PO4, and SiO4 in the outer bay agreed with those long-term trends in the Pearl River discharge. Dissolved inorganic nitrogen (DIN) has approximately doubled from 35-62 to 68-107 mu M in the outer bay during the last two decades, and consequently DIN to PO4 molar ratios have also increased over twofold since there was no change in PO4. The rapid increase in salinity and DO and the decrease in nutrients and suspended solids from the inner to the outer bay suggest that the sewage effluent from the inner bay is rapidly diluted and appears to have a limited effect on the phytoplankton of the adjacent waters beyond Deep Bay. Therefore, physical processes play a key role in reducing the risk of algal blooms and hypoxic events in Deep Bay. |
| 学科主题 | Environmental Sciences; Marine & Freshwater Biology |
| 收录类别 | SCI |
| 原文出处 | SPRINGER |
| WOS记录号 | WOS:000275424300014 |
| 公开日期 | 2011-07-03 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/6319]  |
| 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, KD,Lee, JHW,et al. Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong[J]. ESTUARIES AND COASTS,2010,33(2):399-416. |
| APA | Xu, J.,Yin, KD.,Lee, JHW.,Liu, HB.,Ho, AYT.,...&Harrison, PJ.(2010).Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong.ESTUARIES AND COASTS,33(2),399-416. |
| MLA | Xu, J,et al."Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong".ESTUARIES AND COASTS 33.2(2010):399-416. |
入库方式： OAI收割
来源：南海海洋研究所
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