海洋地质与第四纪地质2026，Vol.46Issue(1)：17-31,15.DOI:10.16562/j.cnki.0256-1492.2025031101
大亚湾表层沉积硅藻分布的季节性差异及原因探讨
Seasonal differences of diatoms distribution in surface sediment and the driving factors in Daya Bay
摘要
Abstract
Diatom samples were collected from surface sediments in Daya Bay,Shenzhen,Guangdong,South China in August 2021(summer)and January 2022(winter)and the seasonal distribution of diatom was analyzed.Distinct seasonal differences in diatom assemblages were observed between the two seasons,and their relationships with local marine environmental changes were explored.Results show that the average abundance of sediment diatoms in summer(2.36×106 valves/g)was slightly higher than in winter(2.12×106 valves/g).Diatom abundance in summer gradually increased from the bay head to the bay mouth,while it decreased from the bay head to the bay mouth in winter.Further analysis revealed that the seasonal changes in water masses and circulation structure driven by the East Asian monsoon were the primary factors responsible for the seasonal differences in diatom abundance and distribution patterns in Daya Bay.Regarding diatom species composition,the spatial distribution of planktonic diatoms in the surface sediments showed a strong correlation with seasonal changes in water temperature,while benthic diatom distributions were more closely related to water depth and hydrodynamic conditions.Therefore,the seasonal differences in water temperature caused seasonal variations in the distribution of planktonic diatoms in the surface sediments in Daya Bay,whereas benthic diatoms exhibited relatively minor seasonal distributional changes.In addition,in coastal areas with high productivity and high sedimentation rates,surface sediment diatom communities may reflect short-term(even seasonal)environmental conditions rather than long-term accumulation.High-resolution sedimentary diatom records from productive coastal regions with relatively stable hydrographic conditions have potential to reconstruct high-temporal-resolution environmental changes,including seasonal-scale variations.关键词
硅藻/表层沉积物/东亚季风/季节变化/大亚湾Key words
diatom/surface sediment/East Asian monsoon/seasonal variability/Daya Bay分类
海洋科学引用本文复制引用
徐若闻,杨志,陈倩娜,季仲强,李杨杰,陈建芳,冉莉华..大亚湾表层沉积硅藻分布的季节性差异及原因探讨[J].海洋地质与第四纪地质,2026,46(1):17-31,15.基金项目
国家自然科学基金重点项目"ENSO/IOD调控南海与北印度洋生物泵输出通量锚系观测及对比研究"(42330412) （42330412）
