| 摘要: |
| 河口区浮游生物作为食物链的重要组成部分，在海洋生物地球化学循环中起到重要作用。为了解黄茅海河口浮游生物及其粒径结构的时空分布特征，于2017年8月17日至21日对黄茅海河口区域微微型浮游生物 (Pico-, <2 μm)，微型浮游生物 (Nano-, 2-20 μm) 及小型浮游生物 (Micro-, 20-200 μm) 及其粒径结构进行观测。结果显示：河口外侧总叶绿素a浓度最高，为19.34 μg.L-1，且大粒径浮游生物占比最高。底层水体受上溯海水影响较为明显，表现出盐度及营养盐浓度随潮汐呈现显著的周期性变化。潮汐过程对不同粒径的浮游生物影响不同，对微微型浮游生物影响较小，对大粒径浮游生物影响较大。涨潮时，表层标准化浮游生物粒径谱 (NBSS) 斜率增大，大粒径浮游生物占比增多。落潮时，NBSS斜率减小，小粒径浮游生物占比增多。潮汐过程及由其引起的营养盐、温度和可利用光强的改变是影响黄茅海河口浮游生物分布的主要因素。本研究可为河口区浮游生态系统以及海洋生物地球化学循环过程等的研究提供重要依据。 |
| 关键词: 浮游生物 浮游生物粒径 潮汐 黄茅海 |
| DOI： |
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| 基金项目:广东省特支计划领军人才项目, 2019TX05H216号; 南方海洋科学与工程广东省实验室 (广州) 重大专项, GML2019ZD0305号。 |
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| THE EFFECT OF TIDAL VARIATIONS ON PLANKTON AND ITS SIZE STRUCTURE IN THE HUANGMAO SEA |
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LIU Zi-Jia, LI Qian, CHEN Yin-Chao, SHUAI Yi-Ping, MA Meng-Zhen
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South China Sea Institute of Oceanology, Chinese Academy of Sciences
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| Abstract: |
| As an important component of the aquatic food chain, plankton plays an important role in the marine biogeochemical cycle. To explore the temporal and spatial patterns of plankton community, a survey was carried out at Huangmao Sea from August 17th to 20th, 2017. Our results showed that the highest concentration of total chlorophyll-a concentration was observed at station outside of the estuary where the large-sized plankton was relatively dominant. The landward flow of seawater had a great impact on the bottom layer here, leading to periodical salinity and temperature modulation along with the tidal height. The impact of tidal forcing was different among plankton of various sizes. The picoplankton was rarely affected by tidal forcing, while the process of tidal forcing greatly influenced large-sized plankton. There were substantial increases of the slope of the normalized biovolume size spectrum (NBSS) and the fraction of large-sized plankton during the high tide. During the ebb tide, the slope of NBSS decreased and the fraction of small-sized plankton increased. In summary, the tidal processes, together with the changes in nutrients, temperature and the available light intensity, are the main factors affecting the distribution of plankton in the Huangmao Sea. Our study could be of a great significance for better understanding planktonic ecosystem dynamics and marine biogeochemical cycle in the estuarine area. |
| Key words: plankton plankton size tide Huangmao Sea |