Planting Distribution of Evergreen Broad-Leaved Trees and Factors Affecting Their Zonal Arrangements in Northeastern Part of Japan

Abstract

This study attempts to consider the planting distribution of evergreen broad-leaved trees and climatic factors affecting their zonal arrangements in northeastern part of Japan located mainly on the cool-temperate decidous forest zone. Data on 41 tree species and 64 cities were analized.
The results obtained from this study are as follows; 1) Planting distribution depends mainly on thermal factors, in particular on winter coldness, which can be explained by the results of factor analysis and Spearman's rank-order correlation analysis. 2) Each city and tree can be classified into 5 groups by using Coldness Index obtained from the results of rearrangement of the planting situation table drawn though the analysis of Quantification Theory III and cluster analysis. 3) Potential zoning map for landscape planting of evergreen broad-leaved trees was drawn based on the Coldness Index. 4) Planting distribution of each species can almost explained by thermal factors, but remainder can explained by managements obtained from the results of multiple regression. 5) Rate of tree which bear nuts can make clear the planting distribution of Quercus myrsinaefolia and this method can apply to explain the northern limit of other species.