Estimating the accuracy of volume tables and volume equations for silver fir

David Hladnik and Milan Kobal (2012) Estimating the accuracy of volume tables and volume equations for silver fir. Zbornik gozdarstva in lesarstva (98). pp. 3-14. ISSN 0351-3114

Preview

PDF - Published Version
Download (882Kb) | Preview

Official URL: http://www.forestry.bf.uni-lj.si/index1.html

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 individual tree volume variance explained increased by 5 % for standard two-entry volume tables and by 11% for threeparameter volume functions.

Item Type:	Article
Keywords:	roundwood volume, tariff, volume functions, silver fir (Abies alba Mill.)
Link to COBISS:	http://www.cobiss.si/scripts/cobiss?command=SEARCH&base=COBIB&select=ID= 3580582
Divisions:	Biotechnical Faculty, Department of Forestry > Group for Applied Mathematics Biotechnical Faculty, Department of Forestry > Group for Landscape forestry and spatial informatics Slovenian Forestry Institute > Department of Forest Ecology
Item ID:	107
Date Deposited:	09 Jan 2014 15:04
Last Modified:	06 Feb 2014 14:21
URI:	http://eprints.gozdis.si/id/eprint/107

Actions (login required)

View Item