A new taper index based on form-factor: application to three bamboo species (Phyllostachys spp.)

Abstract The form-factor for the stem surface area is directly proportional to square root of volume, i.e., law form-factor. Although addresses stems coniferous trees, nature coefficient has not been discussed. In this study, we demonstrated that indicates taper; therefore, it named “Taper Index based on Form-Factor (TIFF).” We also examined relationship between culm and apparent volume 570 culms across three bamboo species ( Phyllostachys pubescens Mazel ex Houz., P . bambusoides Sieb. et Zucc., nigra var. henonis ). held true all species. species-specific TIFF was determined be 0.873 P. , 0.897 0.901 This result implied had a more tapering form compared other two species, while taper similar Our findings align with empirical observations Intra-species variation in considerably small, allowing us evaluate from small number samples. Therefore, conclude provides simple useful method quantifying or taper, facilitates estimation merchantable total volume.