Ocenjevanje natančnosti deblovnic in volumenskih funkcij

Hladnik, David (author), Kobal, Milan (author)

Primerjali smo postopke za ocenjevanje volumna debeljadi jelke na podlagi Huberjevega, Smalianovega in Newtonovega obrazca. Podatke za primerjavo smo dobili z interpolacijo kubičnih zlepkov na podlagi merjenja posekanih dreves. Newtonov in Huberjev postopek sta bila najnatančnejša pri ocenjevanju volumnovstarih jelk (starost do 200 let, povprečni premer 59 cm). Na podlagi izračunanih volumnov smo ocenjevali volumne stoječih dreves v sklopu gozdne inventure. Slovenske Čoklove tarife (1959) so se kljub svoji preprosti zasnovi izkazale s sprejemljivo natančnostjo (povprečno odstopanje v odstotkih od povprečnega volumna < 1 %, R2=0.87). Delež pojasnjene variabilnosti volumnov dreves se je povečal za 5 % pri dvovhodnih deblovnicah in za 11 % pri triparametrskih volumenskih funkcijah.

• Language: Slovenian
• Keywords: volumen debeljadi, tarife, volumenske funkcije, jelka, Abies alba Mill.
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Year: 2012
• Number of pages: Str. 3-14
• Numbering: Št. 98
• PID: 20.500.12556/RUL-28737
• UDC: 630*52
• ISSN on article: 0351-3114
• COBISS.SI-ID: 3580582
• Publication date in RUL: 11.07.2014

HLADNIK, David and KOBAL, Milan, 2012, Ocenjevanje natančnosti deblovnic in volumenskih funkcij. Zbornik gozdarstva in lesarstva. forest and wood science & technology [online]. 2012. Vol. Št. 98, p. 3–14. [Accessed 16 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=28737

Record is a part of a journal

• Title: Zbornik gozdarstva in lesarstva. forest and wood science & technology
• Shortened title: Zb. gozd. lesar.
• Publisher: Gozdarski inštitut Slovenije, Biotehniška fakulteta, Oddelek za gozdarstvo in obnovljive gozdne vire, Biotehniška fakulteta, Oddelek za lesarstvo
• ISSN: 0351-3114
• COBISS.SI-ID: 6206978

Secondary language

• Language: English

Abstract

Comparisons of stem volume estimation techniques were performed based on equations of Huber, Smalian and Newton, and a cubic spline interpolation of points along the silver fir tree stems. Results indicate that Newton`s and Huber`s equations were the most accurate in determining volumes of old silver fir trees (age up to 200 years and average dbh 59 cm). The obtained tree volumes were the basis for the standing timber estimation in the forest inventory. Despite their rather simple structure, the Slovene Čokl (1959) tariff functions proved to be sufficiently accurate (average residual in percentage of the mean volume < 1%, R2=0.87). The proportion of the individualtree volume variance explained increased by 5 % for standard two-entry volume tables and by 11% for three-parameter volume functions.