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Abstract. Seedlings of four Quercus species dominant in Korea (Quercus mongolica, Quercus serrata, Quercus acutissima, and Quercus variabilis) were grown at different CO 2 levels (ambient; 380 ppmv and enriched; 800 ppmv) to determine growth responses under elevated CO 2 . Three weeks after germination, seedlings were transplanted into chambers and grown over a period of 105 days. Aboveground plant parts were harvested at the end of the experiment to measure dry weight, leaf area, specific leaf area (SLA), leaf area ratio (LAR), leaf weight ratio (LWR), and leaf quality (carbon, nitrogen). Q. mongolica exhibited increased growth, Q. serrata and Q. acutissima did not respond to enrichment, and the growth of Q. variabilis was diminished with elevated CO 2 . Total aboveground biomass of each seedling increased by 31% for Q. mongolica, but for Q. variabilis, it decreased significantly by 39% under CO 2 -enriched conditions (p < 0.05). SLA and LAR decreased, and LWR was unchanged or decreased slightly in the elevated CO 2 treatment for all species, with the exception of Q. acutissima. In addition, the elevated CO 2 treatment was correlated with a decrease in total N concentrations, and an increase in the C/N ratio of the leaves of Q. mongolica and Q. acutissima. In conclusion, plant growth responses to elevated CO 2 were species-specific, and they showed large interspecific variation.

This study was proposed to adaptable species according to climate change using warmth index(WI) in Cheonan-Si. RCP 8.5 was used to estimate change of warmth index(WI) depending on climate change in Cheonan-Si. Climatic change of Cheonan-Si was estimated to change from cool temperate forest central zone to warm temperate forest zone. The following plant species will survive within WI change of Cheonan-Si from 2010 to 2050：18 species in the tree layer including Quercus serrata, Q. variabilis, Pinus densiflora, Q. acutissima etc.; 28 species in the shrub layer including Rhus trichocarpa, Lindera obtusiloba, Zanthoxylum schinifolium etc.; 24 species in the herb layer including Oplismenus undulatifolius, Carex lanceolata, etc.; 12 species in the vine plants including Smilax china, Cocculus trilobus, etc. Key Words：Cool temperate forest central zone, Warm temperate forest zone.