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首页> 外文期刊>Estuarine Coastal and Shelf Science >Current status of emerging hypoxia in a eutrophic estuary: The lower reach of the Pearl River Estuary, China
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Current status of emerging hypoxia in a eutrophic estuary: The lower reach of the Pearl River Estuary, China

机译：富营养化河口新兴缺氧的现状：珠江口下游

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摘要

We examine the current status of dissolved oxygen (DO) and its trend over the past 25 years in the lower Pearl River Estuary, a large eutrophic estuary located in Southern China and surrounded by large cities including Hong Kong, Shenzhen and Guangzhou. Monthly cruises conducted from April 2010 to March 2011 clearly show that DO depletion began to emerge in the bottom layer of the lower estuary off Hong Kong in June, and became fully developed in July and August when oxygen-deficient water occupied similar to 1000 km(2) before gradually becoming re-oxygenated in September and October. The development of the low oxygen zone was closely coupled with phytoplankton blooms in the surface water, which was supersaturated with respect to DO suggesting the importance of autochthonous organic matter in fueling bottom DO consumption after settling through the pycnocline. Long-term monitoring data collected in the study area adjacent to Hong Kong by the Hong Kong Environmental Protection Department showed a decreasing trend of similar to 20 +/- 0.9 mu mol kg(-1) yr(-1) in the annual minimum DO concentration in bottom water over the past 25 years. Associated with the decrease in DO was an increase in the annual maximum surface concentration of dissolved inorganic nitrogen (DIN) at a rate of -1.4 +/- 0.3 mu mol kg(-1) yr(-1), suggesting again that eutrophication is the most plausible driver of oxygen deficiency in this region. Therefore, our monthly cruises, along with the decadal monitoring data, reveal a large low oxygen zone, likely developing into a large hypoxic zone driven primarily by anthropogenic eutrophication. This new development suggests environmental stressors such as eutrophication may have a cascading effect, with important and expensive consequences for the regional environment. (C) 2018 Elsevier Ltd. All rights reserved.
机译：我们研究了珠江河口下游地区溶解氧（DO）的现状及其在过去25年中的趋势，珠江河口是位于中国南部，被香港，深圳和广州等大城市包围的大型富营养化河口。从2010年4月至2011年3月进行的每月巡游清楚地表明，溶解氧的消耗从6月在香港低河口的底层开始出现，并在7月和8月充分发展，当时缺氧的水占据了大约1000公里（ 2）在9月和10月逐渐充氧之前。低氧区的发展与地表水中浮游植物的开花密切相关，相对于溶解氧而言，该浮游水是过饱和的，表明在通过比克菌圈沉淀后，自生有机物在增加底部溶解氧消耗中的重要性。香港环境保护署在毗邻香港的研究区收集的长期监测数据显示，每年最低溶解氧的下降趋势约为20 +/- 0.9μmol kg（-1）yr（-1）。过去25年中底水中的浓度。与溶解氧的降低相关的是，溶解无机氮（DIN）的年度最大表面浓度以-1.4 +/- 0.3μmol kg（-1）yr（-1）的速率增加，这再次表明富营养化是该区域最可能的缺氧驱动因素。因此，我们的每月航行以及十年的监测数据显示出一个大的低氧区，可能会发展成一个主要由人为富营养化驱动的大缺氧区。这一新进展表明，富营养化等环境压力因素可能具有连锁反应，对区域环境造成重要而昂贵的后果。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2018年第may31期|58-67|共10页
  • 作者

    Qian Wei; Gan Jianping; Liu Jinwen; He Biyan; Lu Zhongming; Guo Xianghui; Wang Deli; Guo Liguo; Huang Tao; Dai Minhan;

  • 作者单位

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Math, Kowloon, Hong Kong, Peoples R China;

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

    Jimei Univ, Coll Food & Biol Engn, Xiamen 361021, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Math, Kowloon, Hong Kong, Peoples R China;

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

    Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361100, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Pearl River (Zhujiang River) Estuary; Dissolved oxygen; Hypoxia; Eutrophication;

    机译：珠江口溶解氧缺氧富营养化;

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