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The Relationship Between Tree Radial Growth and Topographic and Climate Factors in Red Pine and Oak in Central Regions of Korea.

The Relationship Between Tree Radial Growth and Topographic and Climate Factors in Red Pine and Oak in Central Regions of Korea.
Jae-Gyun Byun¹, Woo-Kyun Lee¹*, Dae-Kyun Nor² , Sung-Ho Kirn³,
Jung-Kee Choi⁴ and Young-Jin Lee
 
Abstract: This study analyzed the impact of climatic and topographic factors on tree radial growth of Pinus
densif/ora and Quercus spp. in central regions of Korea. To find the relationship between annual tree radial
growth and climatic factors, we took the core samples from individual trees and measured the tree radial width.
On the assumption that the tree radial growth is related to the tree age, we estimated the radial growth by the
tree age as an independent variable. Also, we estimated the standard growth, defined as the radial growth of
trees aged 30. As results, we found the spatial auto-correlation in the radial growth of the red pine. Moreover,
we also found the relationships between climatic and topographic and the standard growth using the GAM
(Generalized Additive Model). Increase of temperature has negative impacts on the radial growth of Pinus
densif/ora, while it has positive impacts on the radial growth of Quercus spp .. On the other hands, increase of
precipitation has negative impacts on the radial growth of both species. Lastly, we predicted the spatial
distribution changes of Pinus densif/ora and Quercus spp. using the temperature increase scenario and the
Geographic Information System (GIS) based forest type map. We could predict that Pinus densif/ora is more
vulnerable than Quercus spp. to climate change so that the habitats of Pinus densif/ora will be gradually
changed to the habitats of Quercus spp. in eastern coastal and southern regions of Korea after 60 years.
 
Key words : radial growth, spatial distribution, Pinus densiflora, Quercus spp., climate factors
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