1983 年 33 巻 2 号 p. 109-119
We established 30 quadrats in 27 forests which have been preserved mainly around shrines and temples in the study area. Similarity indices, C_2 based on the number of trees and QS on the presence-absence of all species including the herb layer, were calculated between each pair of quadrats. Stand ordination by the principal component analysis, which used the two similarity indices, made it possible to classify the quadrats into two groups ; one is characterized by the occurrence of Cleyera japonica, and the other by the luxuriant growth of Camellia japonica. A weak but statistically significant correlation could be recognized between loadings of the quadrats on the second factor extracted from C_2-matrix and their altitudes, and between those of the first factor extracted from QS-matrix and their altitudes. Species ordination based on R_δ, an index of interspecific association, also suggested the existence of two species groups ; one is characteristic of the coast and low-lying land, and the other is of inland and mountain districts.