ENVIRONMENTAL EVOLUTION OF EASTERN TAIHU PLAIN DURING THE HOLOCENE ACHIEVED BY PINGWANG CORE
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Abstract:
The paper showed the vegetation and environmental change in the Pingwang area of eastern Taihu Plain during the Holocene, using pollen, foraminifera and AMS14C dating. The eastern Taihu Plain was not affected by the transgression during the Holocene (11.5-0 kaBP), and the area was mainly dominated by fresh water lakes-marshes. Pollen data showed that the area was mainly dominated by evergreen - deciduous forest and the climate was cool and dry during the period of 11.0 ka-10.4 kaBP. Pollen concentration was minimum in I zone, and the tree pollen percentage reached the lowest, and herbaceous plants were 65.8% on average which contain a lot of terrestrial herbs. Pollen concentration increased, and the tree content changed little during the period of 10.4 ka-9.1 kaBP. Aquatic pollen content and algae content increased, showing the increasing temperature and precipitation. 9.1 ka-5.8 kaBP pollen concentration was the largest during the Holocene, and evergreen broad-leaved forest vegetation was the main forest. Aquatic pollen increased sharply to 32%. The content of freshwater algae was the largest during the Holocene, which indicates the most humid and most powerful East Asian monsoon, especially for the period of 8-7 kaBP in Taihu Lake Plain. The evergreen components increased, and the deciduous broad component reduced during the period of 5.8 ka-1.3 kaBP. Terrestrial herb increased to a high level, while aquatic herbaceous decreased and concentration of algae reduced, indicating the dry and cool climate, and the intensity of monsoon gradually reduced.
