2012 Volume 18 Issue 1 Pages 13-19
A two-way volume equation for one of the three major useful bamboos in Japan, Phyllostachys nigra var. henonis, is developed and the goodness of fit is evaluated using the data collected from two different districts. The model used here was the generalized theoretical volume equation. The normal form-factors at 0.7 and 0.8 for P. nigra were steady at 0.622 and 0.558, respectively. Inserting these values into the generalized theoretical volume equation enabled us to determine the coefficients of the volume equation. Although the estimated apparent culm volume was significantly smaller than actual one, the relative mean error of the estimated volume was comparatively small. The volume equation for Phyllostachys bambusoides Sieb. et Zucc. could be directly applied to P. nigra, whereas that for Phyllostachys pubescens Mazel et Houz. could not. This fact indicated that the inter-species characteristics of culm form should be carefully considered when evaluating the bamboo resources by the volume equation. In conclusion, the generalized theoretical volume equation would be effective when evaluating the resources and comparing the stand productivity for P. nigra.
