Sporopollen Assemblage Characteristics of Surface Sediments in Offshore Area of Western Bohai Seas

摘要

The sporpollen analysis has been made of the 788 samples of the surface sediments collected from the offshore water areas of the western Bohai Sea in this paper. Abundant sporopollen is found and three regions of sporpollen assemblage with distinctive features are identified. They are Pinus-Artemisis-Quercus assemblage region in the sea area of Shanhaiguan-Yanghekou; Pinus-Chenopoeliaceae-Artemisia assemblage region in the sea area of yangeou-Nanbao and Chenopodiaceae-Artemisia-Pinus assemblage region in the sea area of Nanbao=Dakuhe. After analysis of and discussion on each assemblage region. it is found that sporpollen assembles in the sea areas are not only controlled by the coastal vegetation, but also by other natural faces. In this paper emphasis is paced n the influence of the river on sporopollen assemblage. The spropollen assemblage division proposed in this paper will provide very useful inspiration for dividing the sediment types and studying the hydrodynamic mechanism of the sea area in this area from now on.