| 摘要: |
| 浮游植物群落结构的时空变化对生物地球化学循环、全球气候及渔业资源具有重要的影响。本文采用ROMS-CoSiNE高分辨率数值模拟结果，分析了渤海浮游植物生物量和群落结构的时空分布特征，讨论了浮游植物群落结构时空差异的主要影响因素。结果表明，渤海表层叶绿素浓度和甲硅藻比在冬季最低、夏季最高。叶绿素浓度呈条带状分布，甲硅藻比呈斑块状分布。冬季、春季和秋季浮游植物群落结构均以硅藻占绝对优势，夏季以硅藻和甲藻共同占优。不同因素对浮游植物群落结构的影响具有时空差异性。在辽东湾、渤海湾、莱州湾和渤海中部，各个季节浮游植物群落结构差异分别受磷酸盐、氮磷比、硅氮比、溶解无机氮的影响最大。在冬季、夏季和秋季，各个区域浮游植物群落结构差异均受溶解无机氮的影响最大，在春季则受硅氮比的影响最大。总体上，营养盐浓度及结构是浮游植物群落结构时空差异的主要影响因子。 |
| 关键词: 渤海 ROMS-CoSiNE模型 浮游植物生物量 群落结构 影响因素 |
| DOI：10.11759/hykx20210103001 |
| 分类号:P735 |
| 基金项目:国家重点研发计划项目（2016YFC1401602）；国家自然科学基金项目（41876018，41806018）；天津市自然科学基金项目（19JCZDJC40600） |
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| Spatial and temporal distribution and factors influencing the phytoplankton community structure in the Bohai Sea |
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LI Zi-lin1, ZHANG Hai-yan2, ZHAO Liang1, XU Fan1
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1.College of Marine and Environmental Science, Tianjin University of Science and Technology, Tianjin 300457, China;2.School of Marine Science and Technology, Tianjin University, Tianjin 300072, China
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| Abstract: |
| Spatial and temporal variations of the phytoplankton community structure have important effects on biogeochemical cycles, global climate, and fishery resources. Based on numerical simulation results of high resolution using the Regional Ocean Modeling System-Carbon, Silicate, and Nitrogen Ecosystem, the spatial and temporal distribution of phytoplankton biomass and community structure in the Bohai Sea were analyzed, and the main factors influencing the spatial and temporal differences in the phytoplankton community structure were discussed. Our results revealed that chlorophyll and the ratio of dinoflagellates to diatoms were lowest in winter and highest in summer in the Bohai Sea. Chlorophyll distribution was banded, and the distribution of the dinoflagellate to diatom ratio was patchy. Diatoms dominated the phytoplankton community in winter, spring, and autumn; dinoflagellates and diatoms dominated the phytoplankton community in summer. The different factors influencing the phytoplankton community structure indicated spatial and temporal differences. Phosphate, N/P ratio, Si/N ratio, and dissolved inorganic nitrogen influence the phytoplankton community structure in the Liaodong Bay, Bohai Bay, Laizhou Bay, and central Bohai Sea in different seasons. Regarding temporal differences, the difference in the phytoplankton community structure in winter, summer, and autumn was most influenced by dissolved inorganic nitrogen, whereas the influence of the Si/N ratio was the greatest in spring. In conclusion, nutrient concentration and structure are the main factors influencing spatial and temporal differences in the phytoplankton community structure. |
| Key words: Bohai Sea ROMS-CoSiNE phytoplankton biomass community structure influencing factors |
