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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


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’ address

(1)
Kyriaki Kitikidou
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)
(2)
Elias Pipinis
Laboratory of Silviculture, Faculty of Forestry and Natural Environment, Aristotle University of Thessaloniki, GR-54124 Thessaloniki (Greece)

Corresponding author

 
Kyriaki Kitikidou
kkitikid@fmenr.duth.gr

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

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