Yao Yukun, Li Yingxin, Zhou Weihua, Long Aimin, Yuan Xiangcheng, Li Tao, Liu Sheng, Huang Hui
Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China; Key Laboratory of Tropical Marine Biotechnology of Hainan Province, CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Sanya 572000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Laboratory of Tropical Marine Bio-resources and Ecology, Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Sanya National Marine Ecosystem Research Station, Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China; Key Laboratory of Tropical Marine Biotechnology of Hainan Province, CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Sanya 572000, China; University of Chinese Academy of Sciences, Beijing 100049, China; Science Unit, Lingnan University, Hong Kong, China.
Mar Pollut Bull. 2025 Nov;220:118473. doi: 10.1016/j.marpolbul.2025.118473. Epub 2025 Jul 23.
Sanya Bay is a typical tropical coral reef bay with high water transparency. Solar Ultraviolet Radiation B (UVB) radiation exposure affects phytoplankton primary production, but the understanding of its underlying mechanism is still limited. This study investigated the responses of spatial and seasonal changes of chlorophyll a (Chl a) and phytoplankton photosynthetic carbon fixation to solar UVB in Sanya Bay in 2011. Results showed that Chl a was the highest in autumn and lowest in spring. Surface phytoplankton photosynthetic carbon fixation (SPP) was higher in winter and lower in summer, while water column integrated primary production (IPP) showed little variation among seasons except spring. Overall, Chl a, SPP and IPP all decreased with increasing distance from the shore. UVB inhibited both SPP and IPP throughout the year, with the inhibition ratios (IR) ranging from 32.01 % to 38.88 %. Chl a, SPP and IPP could be affected by the interaction between UVB, nutrient levels, water column stability and light availability. The study highlighted the importance of long-term observation to establish a more comprehensive understanding of the driving mechanism of Chl a and primary productivity in Sanya Bay.
三亚湾是一个典型的热带珊瑚礁海湾，水体透明度高。太阳紫外线B（UVB）辐射会影响浮游植物的初级生产力，但其潜在机制的认识仍较为有限。本研究调查了2011年三亚湾叶绿素a（Chl a）的空间和季节变化以及浮游植物光合碳固定对太阳UVB的响应。结果表明，Chl a在秋季最高，春季最低。表层浮游植物光合碳固定（SPP）在冬季较高，夏季较低，而水柱综合初级生产力（IPP）除春季外各季节变化不大。总体而言，Chl a、SPP和IPP均随离岸距离的增加而降低。UVB全年均抑制SPP和IPP，抑制率（IR）在32.01%至38.88%之间。Chl a、SPP和IPP可能受到UVB、营养水平、水柱稳定性和光照可用性之间相互作用的影响。该研究强调了长期观测对于更全面了解三亚湾Chl a和初级生产力驱动机制的重要性。
