【摘要】 近百年时间尺度里人类活动对近岸海域的环境影响十分剧烈,而这种剧烈的影响作用被记录在近岸海域沉积环境中。其中海洋沉积物中的有孔虫化石是指示近岸海域生态环境变化最敏感的生物指标之一。通过对渤海湾西部区域近岸海域沉积物柱中有孔虫化石的分析鉴定发现,共鉴定出底栖有孔虫14属共22种,其中占全群2%以上的优势种共8个,有孔虫化石主要还是以瓷质壳种类为主,占到了整个种群数的80%左右,其次为玻璃壳,种数约占到总数的15%左右,胶质壳种类数最少,约占到5%左右。种群组成特征表明1980年前渤海湾受到径流影响下的沿岸低盐水团的强烈影响,1980-2000年水深减小和陆源碎屑沉积速率的增大可能是引起底栖有孔虫群落组成的主要原因。2000年后,沉积环境受陆源淡水强烈影响,沉积速率较高,陆源碎屑堆积速率的降低是底栖有孔虫群落变化的主要影响因素。更多还原

【Abstract】 In the past century, human activities have had a severe impact on the environment of coastal waters,and this dramatic effect has been recorded in the sediment of coastal environment.Among them,foraminifer fossils in marine sediments are one of the most sensitive biological indicators to indicate changes in the ecological environment of coastal environment.Through the analysis and identification of foraminifer fossils,22 species of 14 genera of benthic foraminifera were identified in the sediment in the coastal environment of the western Bohai Bay,including 8 dominant species that accounted for more than 2% of the total population.Foraminifera fossils were mainly dominated by porcelain shells,which accounted for about 80% of the total population, followed by glass shells, which accounted for about 15% of the total, and the smallest number of colloidal shells,which accounted About 5%.The characteristics of the population composition indicated that the Bohai Bay was strongly affected by the coastal low-salt water mass under the influence of runoff before 1980.The decrease of water depth and the increase of the terrestrial debris deposition rate from 1980 to 2000 may be the main causes of benthic foraminifera the reason.After 2000, the sedimentary environment was strongly affected by terrestrial freshwater, and the deposition rate was high. The decrease of terrestrial debris accumulation rate was the main influencing factor for benthic foraminifera community changes.更多还原