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A sediment core from the Cheollipo arboretum ( 47' 57'N, 09' 04') was studied for pollen analysis in order to reconstruct postglacial vegetational change and environmental changes around the central western region of the Korean Peninsula. The record shows four pollen assemblage zones: Zone CHL-I, Quercus stage (ca. 9,3006,200 yr BP): zone CHL-II, Quercus-Pinus stage (ca. 6,2004,600 yr BP); zone CHL- III, Pinus-Quercus stage (ca. 4,6001,160 yr BP): zone CHL-IV and Pinus stage (ca. 1,160 yr BP-present). During the 9,3008,500 yr BP, the early Holocene, researchers have guessed a piece of cool-temperate norihern/altimontane mixed coniferous and deciduous broad-leaved forest. Between 8,5004,600 yr BP the Quercus dominated the landscape of study area and the established dates of this typical cool-temperate central/montane deciduous broad-leaved forest vegetation might be ca. 6500 yr BP, and then the Pinus developed around the site at ca. 5,700 yr BP. The abrupt increase of Pinus and NAP (non-arboreal pollen) after ca. 1,100 yr BP indicates the vegetation changes due to human activities. From the dynamics of the Chenopodiaceae pollen indicating salt marsh and freshwater pollen flora such as Typha, Trapa, Nymphoides and so forth, we suggest that the tidal flat was altered into freshwater lake around 6,500 yr BP.

Postglacial Vegetation History of the Central Western Region of the Korean Peninsula