2025 Volume 34 Issue 1 Pages 41-46
Yusuke Doi, Wataru Ishii, Naoki Ikeguchi: Estimation of trunk volume of warm-temperate broadleaf forests in Osaka Prefecture. Ap. For. Sci. Tree trunk volume data in forest harvest tables are limited to broadleaf forests, particularly in older age classes. To constrain the differences between the measured values in actual forests and those in the Osaka Prefecture forest harvest table, we conducted trunk volume surveys at seven sites in warm-temperate oak forests ranging from the 6th to 23rd age class. In each forest, diameter at breast height and tree height were measured within a 10 m × 10 m plot using a backpack-type terrestrial light detection and ranging (LiDAR) (LA03), and the results were compared with values in the existing forest harvest table. The average tree height measured using LA03 was generally consistent with that obtained by the aerial laser surveys, suggesting reliable accuracy. Trunk volumes measured in the field were consistently higher than those in the existing table. These results suggest that trunk volume in broadleaf forests continues to increase beyond the 6th age class, which is essential for resource utilization and carbon dioxide absorption estimates.
