The Planting Distribution of Trees and Shrubs for Landscaping and Temperature Factors in Hokkaido

Abstract

Geographical planting distributions of 125 species of trees and shrubs for landcaping in Hokkaido were surveyed by means of questionnaires, and the temperature factors which might govern their distributions were examined. The average annual minimum temperature or January mean temperature were found to be among the factors most closely related to the distributions. By using the isogram of average annual minimum temperature partially revised with a ‘Index of Warmth’ isoline, a tree planting zone map for Hokkaido was prepared for practical use.