渤海全新世甲藻孢囊及其环境意义研究海洋地质专业论文.docxVIP

摘要囊丰度范围在31—1247粒／克，受沉积物平均粒径的影响较大。 摘要 囊丰度范围在31—1247粒／克，受沉积物平均粒径的影响较大。 (4)B42柱状样优势种的环境指示意义： 膝沟藻组合及网状原角管藻的变化表明在aBP海水温度较高， 约6400-4400 aBP海水温度略有增加，约4400 aBP至今，海水温度受黄海暖流 余脉的影响更明显，表现出复杂的海水温度变化。 甲藻孢囊丰度的波动与海平面的波动较一致，海平面升高，甲藻孢囊的丰度 也会相应增加。 多边舌甲藻的含量相对稳定，粗略推测其盐度变化不大，但很难用单一的多 边舌甲藻含量变化解释渤海盐度的具体变化情况。 甲藻孢囊的丰度、异养型甲藻孢囊的丰度及自养型甲藻孢囊的丰度反映渤海 海约8000 aBP以来处于正常的营养盐状态。具刺膝沟藻、多边舌甲藻、异养原 多甲藻反映出在约8000--4400 aBP渤海营养物质主要来源于河流陆源输入和海 平面上升入侵渤海，约4400 aBP至今以陆源输入为主，但该阶段气候转冷，陆 源输入减弱。 关键字：甲藻孢囊：全新世；渤海；环境 Ⅱ 万方数据 摘要Abstract 摘要 Abstract Dinoflagellates ale very ancient eukaryotes,many dinoflagellates can produce resting cysts．Dinoflagellate cysts in sediments have Significant meaning on reflecting the seawater temperature，salinity,nutrients，sea·level and other environmental factors， which have the potential to reveal occurrence of red tide．The Bohai Sea is a semi-enclosed coastal sea which obviously impected by the topography,climate， hydrology and human activities．Therefore，dinoflagellate cysts from surface and COre sediments were identified in this paper,the relationship between the dinoflagellates cysts composition，distribution and environmental factors were detailed analyzed with mathematical statistics sottwares．Combining the chronological age with sample column，through the analysis of content variation of dominant species，the change of the marine environment in seawater temperature，salinity,nutrients and sea level since 8000 aBP in the Bohai Sea were discussed in this paper．It can provid background information of the marine environmental evolution in Bohai Sea area．The main conclusions in the paper are as follows： (1)Through the analysis of the surface sediments collected from 24 stations，1 3 genus and 43 species(including two unidentified species)cysts were indentified，of which the dominant group were Alexandrium minutum，Gonyaulax spinifera, Lingulodinium polyedrum，Polykrikos sp．．In dinoflagellate cysts community, ecological habits were very complicated，neritic species and widespread species， wa