• 论文 •

### 长江三角洲表层沉积孢粉、藻类组合

1. 1. 同济大学海洋地质系;
2. 国家海洋局第二海洋研究所
• 出版日期:1982-07-15 发布日期:1982-07-15

### THE SPORE-POLLEN AND ALGAE ASSEMBLAGES FROMTHE SURFACE LAYER SEDIMENTS OF THEYANGTZE RIVER DELTA

Wang Kai-fa1, Zhang Yu-lan1, Sun Yu-hua2

1. 1. Department of Marine Geology, Tuntichi University;
2. Second Institute of Marine Research, National Oceanographic Bureau
• Online:1982-07-15 Published:1982-07-15

Abstract: Through the systematic research of spore-pollens and algae from the surface layer sediments of the Yangtze River Delta, we have obtained the following four conclusions:1. The spore-pollen assemblages of Yangtze River Delta from its surface sediments have a close relationship to the vegetations on the Delta Plain and surround-ing hills. The main part of the spore-pollen grains in the Delta Plain came from its own vegetation, the rest came from the vegetation of neighbouring hills chiefly brought by the wind. The spore-pollen grains in the delta-front and predelta deposit under the sea came from the mesic-herbaceous plants and littoral halophytes of the delta plain and from the mixed forest of evergreen broad leave and deciduous broad leave trees. They were brought there by wind and river current whereas the sea current had little influence. The spore-pollen assemblages of the delta surface sediments might reflect the characteristics of vegetation and climate of the delta in recent times, they are the collateral evidence of delta deposit.2. The different facies of the Yangtze River Delta have different spore-pollen assemblages (showing in Tab. 1.).3. The different geomorphic units of the Yangtze River Delta have different density of spore-pollen grains. The density of spore-pollen grains is higher iu the laud part, lower in the submarine part of the delta. It is lowest in the river mouth. Fine sediments have higher density and coarser grains have lower density.4. The extent of distribution of hydrophyte pollens in the marine sediments reflect approximately the boundary of recent spreading of the Yangtze River Delta. The furthermost limit is 123?0’E in the East China Sea.