State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
Mar Pollut Bull. 2024 Nov;208:116955. doi: 10.1016/j.marpolbul.2024.116955. Epub 2024 Sep 20.
Dynamics of phytoplankton in coastal waters is a function of nutrient influx and the present study investigated the trend in nutrient dynamics and phytoplankton abundance of Daya Bay (DB), South China Sea, from 1986 to 2020. Dissolved inorganic nitrogen (DIN), Dissolved inorganic phosphate (DIP) and Silicates were measured. DIN concentration exhibited an increasing trend over the last decades, and it was above the threshold for the phytoplankton growth. DIP level showed a significant decreasing trend throughout the studied period, falling below the threshold for phytoplankton growth in the last decade, where harmful algal blooms were dominated by the dinoflagellates. Long-term anthropogenic influences severely change influx of DIN, DIP, and silicates which in turn shape the architecture of phytoplankton communities. Thus, the understanding of the complex interaction between nutrient influx, anthropogenic activities and dynamics of both water quality and biological elements are particularly important to decide criteria to manage coastal ecosystems.
近海浮游植物的动态是营养物质流入的函数，本研究调查了 1986 年至 2020 年期间南海大亚湾的营养物质动态和浮游植物丰度的趋势。测量了溶解无机氮（DIN）、溶解无机磷（DIP）和硅酸盐。在过去的几十年里，DIN 浓度呈上升趋势，超过了浮游植物生长的阈值。在整个研究期间，DIP 水平呈显著下降趋势，在上一个十年中下降到浮游植物生长的阈值以下，其中有害藻类水华主要由甲藻主导。长期的人为影响严重改变了 DIN、DIP 和硅酸盐的流入，这反过来又影响了浮游植物群落的结构。因此，了解营养物质流入、人为活动以及水质和生物要素动态之间的复杂相互作用，对于决定管理沿海生态系统的标准尤为重要。
