Site quality assessment of degraded Quercus frainetto stands in central Greece
Kyriaki Kitikidou (1) , Elias Milios (1), Elias Tsirekis (1), Elias Pipinis (2), Athanasios Stampoulidis (1)
iForest - Biogeosciences and Forestry, Volume 8, Issue 1, Pages 53-58 (2015)
doi: https://doi.org/10.3832/ifor1069-007
Published: May 12, 2014 - Copyright © 2015 SISEF
Research Articles
Abstract
The potential yield of a site is measured by site index, which is defined as the dominant height of a stand at a base age. A site index model for site quality assessment of Quercus frainetto (Hungarian oak) stands in central Greece was developed using a base age of 50 years. Data were collected from 39 temporary sample plots of 10 x 10 m. Linear regression models widely used in site index studies were fitted to height-age data. The adjusted coefficient of determination (R2adj), root mean square error (RMSE), bias, coefficient of determination for the prediction (R2pr) and residual plots were used for the choice of the best-fitting model. The best model was H = -0.231+0.251A-0.001A2, where H is the predicted height at age A. The guide curve method was adopted in constructing the sites curves, with the chosen model as the guide curve. Based on this curve, the study area was divided into three site quality classes (I to III), with class I representing the best and class III the poorest. Also, the presence of a Simpson’s paradox in these analyses is discussed. The results showed that a 50-year-old stand in the study area attained an average dominant height of about 11, 8 and 6 m on site quality classes I, II and III, respectively. The Hungarian oak stands of the present study can be considered very low productivity stands.
Keywords
Guide Curve Method, Hungarian Oak, Simpson’s Paradox, Site Quality
Authors’ Info
Authors’ address
Elias Milios
Elias Tsirekis
Athanasios Stampoulidis
Department of Forestry and Management of the Environment and Natural Resources, Democritus University of Thrace, Pandazidou 193, GR-68200 Orestiada (Greece)
Laboratory of Silviculture, Faculty of Forestry and Natural Environment, Aristotle University of Thessaloniki, GR-54124 Thessaloniki (Greece)
Corresponding author
Paper Info
Citation
Kitikidou K, Milios E, Tsirekis E, Pipinis E, Stampoulidis A (2015). Site quality assessment of degraded Quercus frainetto stands in central Greece. iForest 8: 53-58. - doi: 10.3832/ifor1069-007
Academic Editor
Raffaele Lafortezza
Paper history
Received: Jul 11, 2013
Accepted: Jan 26, 2014
First online: May 12, 2014
Publication Date: Feb 02, 2015
Publication Time: 3.53 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2015
Open Access
This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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