渤海湾中北部表层沉积硅藻分布及环境指示意义

摘要

发现渤海湾中北部表层沉积硅藻21属37种,确定了Cyclotella striata/stylorum,Paralia sulcata和Coscinodiscus perforatus等9个优势种的地理分布；进而根据聚类分析,将研究区表层沉积硅藻划分为6个组合区.讨论了控制它们分布的环境因素,发现盐度与深度是重要控制因素,沉积物底质类型亦对硅藻的分布有一定的影响.%37 diatom species, belonging to 21 genera, have been found from the surficial sediments in the north-central Bohai Bay. The distribution of nine dominant species, such as Cydotella striata/stylorum, Paralia sulcata and Cosrinodiscus perforatus, has been determined. Based on cluster analysis, the authors have divided the study area into six diatom assemblage -regions. Furthermore, environmental factors controlling the diatom distribution are discussed in this paper. It is revealed that salinity and water depth are two most important factors while the grain size of the sediments also has some influences on the distribution.