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Late-Holocene palaeoclimatic change at the Dongnimdong archaeological site, Gwangju, SW Korea
Soo Lim, Hyoun,Chung, Chull-Hwan,Kim, Cheong-Bin,Il Lee, Yong,Jong Lee, Heon,Chul Lee, Young E. Arnold Distributed in North America by Cambridg 2007 The Holocene Vol.17 No.5
<P>A late-Holocene swamp sediment record is presented from the Dongnimdong archaeological site in SW Korea. Pollen analysis, geochemical analyses and radiocarbon dating have been used to reconstruct the vegetation and climatic changes. According to the pollen records, temperate deciduous broadleaved trees combined with herbs predominated in the study area ecology. Reduction of deciduous broadleaved trees with the spread of herbaceous taxa found in the middle part (<I>c</I>. 3300U2014;2600 yr BP) indicates climatic change toward cooler and drier conditions. Significant increase in sand content and concomitant decrease in TOC content may suggest the occurrence of a period of drought. Vegetation changes recorded in the pollen sequence indicate the destruction of lowland deciduous forests and an accompanied expansion of grasses resulting from the climate changes. However, the increase of cultivation-accompanied herbs and excavated wooden tools for agriculture suggest the significant anthropogenic influence on the vegetation changes.</P>
Lim, Hyoun-Soo,Han, Myung-Ja,Seo, Dong-Cheol,Kim, Ji-Hee,Lee, Jae-Il,Park, Hyun,Hur, Jae-Seoun,Cheong, Yong-Hwa,Heo, Jong-Soo,Yoon, Ho-Il,Cho, Ju-Sik The Korean Society for Applied Biological Chemistr 2009 Applied Biological Chemistry (Appl Biol Chem) Vol.52 No.5
The accumulation of selected heavy metals in the fruticose lichen Usnea aurantiacoatra is reported in the vicinity of the Korean research station on Barton Peninsula, King George Island, West Antarctica. To assess the impact of human activities in the study area, all samples were divided into five groups according to distance from the research station. The corresponding heavy metal levels in samples near the station were relatively higher than those collected far from the station. In particular, a very high level of Pb near the station strongly suggests the anthropogenic release of this pollutant. The relationship between trace metal content and age of the lichen was investigated, but no significant difference was found. When evaluating the vertical distribution of heavy metals in lichen thalli, most elements, particularly Pb, accumulated preferentially in the upper parts, probably due to the morphology of U. aurantiacoatra. Therefore, the vertical distribution of heavy metals in fruticose lichens should be considered to enhance data quality in biomonitoring studies.