Abstract
In this paper we constructed a volume table for broad-leaved trees including a stem and branches using a relative stem curve, provided that the trees are subject to the pipe model theory. First we measured diameters at every one meter length of stems and branches of 98 sample trees of Quercus acta and Castanopsis sieboldii in two stands in the Tokyo University Forest in Chiba, Japan, and calculated the square roots of the squared sum of diameters to fit relative stem curves. As a result, all of the relative stem curves fitted well to the samples, indicating that a relative stem curve could generally express the shape of broad-leaved trees including a stem and branches just as well as it has been employed to express the stem shape of coniferous trees. Finally a volume table was constructed using the average relative stem curve of 55 Quercus acta sample trees in the same stand, and the accuracy and precision of the table were examined against other sample trees compared with the table constructed by the conventional way of using the Yamamoto-Schumacher formula. The former gave less accuracy than the latter but gave almost the same precision.
