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长江三角洲奉贤DY03钻孔的全新统沉积物中蕨类孢子和藻类的种类丰富,如何正确鉴别,并解释它们的来源、传播与沉积过程等问题,成为讨论过去生物多样性变化、古生态环境与气候事件的重要基础。本文收录奉贤DY03钻孔沉积物中出现频率较高的蕨类孢子和藻类,蕨类孢子可能鉴定到种或属的水平,但也有部分种类只能鉴定到科的水平,有的类型难以确定,则以形态种来归类。凤尾蕨科的种类具有突出的多样性(约8种类型),其次是水龙骨科、卷柏科、里白科、石松科,再次是紫萁科、水蕨科、桫椤科等。藻类根据生态型分为淡水域和咸水域或半咸水域的种类,前者以环纹藻和盘星藻为代表,后者则以沟鞭藻为典型。本研究包含的41种孢子和5种藻类可作为亚热带地区类似沉积环境的孢粉鉴定参考。文中还简要讨论了DY03钻孔的蕨类孢子来源和藻类的古生态学价值。
Fern spores and algae in the sediments of the Fengxian DY03 boreholes in the Yangtze River Delta are rich in species, and how to correctly identify and explain their sources, propagation and deposition processes and other issues, and become the focus of discussion on past changes in biodiversity, paleoecological environment and An important basis for climate events. In this paper, fern spores and algae, which occur frequently in borehole sediments of Fengxian DY03, are included. The fern spores may be identified as species or genus, but some species can only be identified to the level of families, and some types are difficult to determine. The morphological species to be classified. Pteridaceae species have prominent diversity (about 8 types), followed by the water keel Division, the Convolvulaceae, Ribesceae, Lycopodium, once again Aster Branch, the water fern Branch, Suidaidae and so on. According to the ecological type, the algae are divided into freshwater, saltwater or brackish waters. The former is represented by Cyclobalanopsis algae and Radix algae, while the latter is typical of the dinoflagellate. The 41 species of spores and 5 species of algae contained in this study can be used as references for the identification of sporopollen in similar sedimentary environments in the subtropical region. The paper also briefly discussed the origin of pteridophytes from DY03 and the paleoecological value of algae.