1991 Volume 46 Issue 1 Pages 1-8
An investigation was made about the sirnilarity between the distribution of tree-ring indices and that of climatic elements based on tree-ring data from 9 points in Shikoku. Principai component analysis and correlation analysis were applied to the tree-ring indices and the monthly climatic elements. As a result, the second component of tree-ring indices and the frst component of minirnum temperature in July show high correlation coefficients. So, for years in which the values of the score of second component of tree-ring indices were 1.0, comparisons were made between the distribution of tree-ring indices and minimum ternperatures in July. It becomes clear from the comparison that the distribution of tree-ring indices resembles that of mirrimum temperature in years when the score of the tree-ring indices is more than 1.4.
