Abstract
In this study, it has been aimed at investigating the bias (mean error) in calculating volumes of felled trees. Calculating determined whether mean error was significantly different from zero by using paired samples t- test. It examines the relationship of bias magnitude to measurement interval and presents guidelines for meeting accuracy requirements. For this research, various formulas and segment combinations were tested. The data was obtained from dominant 150 oriental beech (Fagus orientalis Lipsky.) trees by stem analysis, which were taken from the pure, even-aged, untreated and naturally grown stands; in the West and Middle Black Sea Region. In all trees, cross-sectional diameter in various points and heights were measured. Besides, results of the methods have also been graphically showed according to tree height, fraction of stem between measurements, and mean error of various volume formulas, which were used by Huber, Smalian and Newton Riecke. Estimates of formulas and segment combinations were compared with “true” volume of each stem by using paired samples t- test, which was determined by aggregating the volumes of measured short section (2m) using Huber's. The mean error of the Newton-Riecke estimate of the stem volumes was not significant and Newton-Riecke estimate was clearly more accurate, and its mean error was not significant at 0.05 probability level. Keywords: Stem analysis, oriental beech (Fagus orientalis Lipsky.), stem volume formula, Huber, Smalian, Newton-Riecke.
Sign-in/Register to access full text options 
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 callMore From: Turkish Journal of Forestry | Türkiye Ormancılık Dergisi
Disclaimer: 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.
