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首页> 外文期刊>Estuarine Coastal and Shelf Science >Estuarine phytoplankton dynamics and shift of limiting factors: A study in the Changjiang (Yangtze River) Estuary and adjacent area
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Estuarine phytoplankton dynamics and shift of limiting factors: A study in the Changjiang (Yangtze River) Estuary and adjacent area

机译：河口浮游植物动力学及其限制因素的迁移：长江口及邻近地区的一项研究

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摘要

Environmental factors in estuaries are highly variable in terms of both spatial and temporal dimensions and hence phytoplankton biomass, as well as community structure, is dynamic. Two cruises were carried out in the Changjiang (Yangtze River) Estuary and adjacent area in spring and summer. The result of CHEMTAX calculation suggests that in spring diatoms and chlorophytes contribute equally to phytoplankton biomass, while phytoplankton community structure is mainly composed of diatoms in summer. We encountered blooms in summer with chlorophyll a (CHLa) over 10 μg l~(-1) off the Changjiang Estuary and they were mainly caused by diatoms (>90%). Based on the HPLC analysis of samples collected, phytoplankton pigments mainly concentrated beyond the front between 122.5°E and 123°E where nutrients and turbidity were best balanced. Euphotic depth (Z_(eu), calculated from Secchi disk depth) to surface mixed layer depth (Z_(miX)) ratio (i.e. Z_(eu)/.Z_(mix)) were comparable in spring (average value 1.2) and the ratio increased to 5.2 in summer. Variation of the ratio indicates an apparent shift of light and physical conditions from spring to summer. Correspondingly, CHLa was positively related to Z_(eu)/Z_(mix) ratio (r~2 = 0.83) in spring, indicating the light limitation over the whole investigation area. On the other hand, the relationship of CHLa and Z_(eu)/Z_(miX) ratio became unclear when Z_(eu)/Z_(miX) ratio >3 in summer. This is probably due to the combination of both light limitation before the front and nutrient limitation beyond the front. In addition, evidence was found that light condition can impact the diagnostic pigments in the Changjiang Estuary.
机译：河口的环境因素在空间和时间维度上变化很大，因此浮游植物的生物量以及群落结构是动态的。春季和夏季，长江（长江）河口及附近地区进行了两次巡游。 CHEMTAX计算结果表明，春季硅藻和绿藻类植物对浮游植物生物量的贡献同等，而夏季浮游植物群落结构主要由硅藻组成。夏季我们在长江口附近遇到了叶绿素a（CHLa）超过10μgl〜（-1）的花朵，这些花朵主要是由硅藻引起的（> 90％）。根据对所收集样品的HPLC分析，浮游植物色素主要集中在122.5°E和123°E之间的前沿，此处营养和浊度达到最佳平衡。春季的平均深度（Z_（eu），由Secchi盘深度计算得出）与表面混合层深度（Z_（miX））之比（即Z_（eu）/。Z_（mix））与弹簧（平均值1.2）相当，夏季比率增加到5.2。该比率的变化表明从春季到夏季，光照和身体状况发生了明显变化。相应地，CHLa与春季的Z_（eu）/ Z_（混合）比呈正相关（r〜2 = 0.83），表明整个研究区域的光限制。另一方面，当夏季的Z_（eu）/ Z_（miX）比> 3时，CHLa与Z_（eu）/ Z_（miX）比的关系变得不清楚。这可能是由于前部的光限制和前部以外的营养限制的结合。另外，有证据表明光照条件会影响长江口的诊断性色素。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第3期|393-401|共9页
  • 作者

    Zhuo-Yi Zhu; Wai-Man Ng; Su-Mei Liu; Jing Zhang; Jay-Chung Chen; Ying Wu;

  • 作者单位

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Zhongshan Road North 3663, Shanghai 200062, PR China;

    Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China;

    College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, Oingdao 266100, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Zhongshan Road North 3663, Shanghai 200062, PR China;

    Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China;

    State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Zhongshan Road North 3663, Shanghai 200062, PR China;

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  • 正文语种 eng
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  • 关键词

    photosynthetic pigments; limiting factors; light; surface mixed layer; nutrients; changjiang estuary;

    机译：光合色素;限制因素;光;表面混合层;营养素长江口;

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