Journal of Food, Agriculture and Environment
Vol 8,
Issue 2,2010
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Taper equation compatible with volume equation for the Hungarian oak stands under restoration at Northern Greece
Author(s):
Kyriaki Kitikidou
Recieved Date: 2010-01-11, Accepted Date: 2010-04-03
Abstract:For the coppice stands of Hungarian oak (Quercus frainetto Ten., also known as Quercus conferta Kit.) at the forest of Lofos of Pieria prefecture (Northern Greece), linear and nonlinear taper equations were compared, which estimate the diameter dhi at any tree height hi. For this aim a systematic sample of 90 trees was selected. At each tree the stump height diameter, the diameter at 80 cm height and the breast height diameter were measured. Then diameters per 2 m above the breast height diameter were estimated, that is at 3.3, 5.3, 7.3… m above the ground and also total tree heights. For the comparison of equations that was fitted to data, the residuals normality, their randomness, independence, homogeneity of variance and the value of mean absolute error were examined. In order to test the compatibility of the selected equation with the corresponding volume equation for the region, the homogeneity test of Wilcoxon was applied and it was found that the two equations are compatible.
Keywords:Homogeneity,
tests regression analysis, residuals analysis, taper equations, volume equations, volume tablesJournal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 866-869
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