2003 Volume 29 Issue 1 Pages 45-50
Measurement of the pruning brunch with maintenance of roadside trees and a questionnaire about pruning frequency to roadside trees administrators in all parts of Japan were carried out. And the influence of pruning upon the carbon fixation of roadside trees was considered, by means of comparing annual pruning brunch, which was calculated in various size of trees, with annual wood growth. As a result of the measurement, the dry-weight of the annual pruning brunch was increased with the growth of trees, and a dry-weight ratio of the annual pruning brunch to annual wood growth reached 45.3%, when the D.B.H. was 25cm, on an average of 4 species. And as a result of the questionnaire, it was known that a ratio of trees without pruning was 17.9% on an average of 6 species. These results showed that necessities to use the pruning brunch in effective and consider planting methods without pruning, as measures of the global warming in the future.
