Establishing tree ring δ¹⁸O chronologies for principle tree species (T. Cuspidata, P. Koraiensis, A. Koreana, Q. Mongolica) at subalpine zone in Mt. Jiri national park and their correlations with the corresponding climate

50-year tree-ring δ¹⁸O chronologies (1966∼2015) for principle conifer tree species (Taxus cuspidata, Pinus koraiensis, Abies koreana) and Quercus mongolica at subalpine zone in Mt. Jiri were established. The establishing of tree-ring δ¹⁸O chronologies for each tree species were fulfilled using four trees, which showed the good result in cross-dating. In the comparisons between tree-ring δ¹⁸O chronologies within the same tree species all tree species showed reliable results statistically (p < 0.001), and they also showed EPS higher than 0.85. In addition to, the reliable correlations (p < 0.001) were verified between tree-ring δ¹⁸O chronologies of four tree species, as well. In the response function analysis in order to investigate the relationships between tree-ring δ¹⁸O chronologies and corresponding climatic factors, i.e., monthly precipitation and mean temperature, T. cuspidata showed a negative correlation with May precipitation (p < 0.05) and A. koreana showed a negative correlation with April precipitation (p < 0.05). If long tree-ring δ¹⁸O chronologies of T. cuspidata and A. koreana will be established, it will be possible to reconstruct April and May precipitation in the past when we have no the meteorological data.