Abstract
A basic calculating unit is needed to estimate an amount of carbon fixation by planted trees in urban area, therefore six species, thirty planted trees were analyzed by means of the stem analysis, and the growth process were clarified. As the result, wood growth had close correlations to tree height and diameter at breast height, and regression curve expressions were made. Furthermore, tree height and diameter at breast height were proportional to tree age. According to these correlations, the expressions for calculation of annual wood growth were made. The annual wood growths from these expressions are useful as a basic calculating unit for various size trees of each species. The form of expressions are as follows, Y= a{(X+c)b−Xb}; Y: annual wood growth (kg/y); X: tree height (m) or diameter at breast height (cm); a, b and c: constants as each species.
