Abstract
Total volume equations and functions that predict Pressler height, the Hohenadl reference diameter squared, and the Girard form class were constructed from 54 ponderosa pine ( Pinus ponderosa Dougl.) trees. The sample trees were sectioned into lengths that correspond to 10% of the total tree height. It was hypothesized that enhanced estimates of total tree volume could be made by utilizing volume equations that incorporate some variable of upper stem form. Utilizing three-stage least-squares analysis, taper functions and merchantable-height equations were constructed. After imposing conditions on the taper functions and merchantable-height equations, new algorithms were developed that predict the Hohenadl reference diameter squared, the Girard form class, and Pressler height as functions of any single upper-stem measurement. The values are later substituted into total-volume equations that utilize the Hohenadl reference diameter squared, the Girard form class, and Pressler height as independent variables. A test with an independent data set revealed that the Pressler volume and natural form factor equations provided consistently superior estimates of total volume.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
