Soil and forest productivity: a case study from Stone pine (Pinus pinea L.) stands in Calabria (southern Italy)
F Bravo (1) , M Lucà (2), R Mercurio (2), M Sidari (2), A Muscolo (2)
iForest - Biogeosciences and Forestry, Volume 4, Issue 1, Pages 25-30 (2011)
doi: https://doi.org/10.3832/ifor0559-004
Published: Jan 27, 2011 - Copyright © 2011 SISEF
Research Articles
Abstract
The objective of this study was to determine whether edaphic and/or topographic variables may be used as predictors of site productivity in Stone pine stands in Calabria (southern Italy). To accomplish this goal, a linear discriminant rule was developed using data from 16 pure Stone pine stands, grouped into three different classes based on the mean dominant height annual growth. The discriminant rule was based on three linear models (one for each class) that jointly predicts site class for a given stand. To test the accuracy of the proposed method, cross-validation was carried out by developing 16 alternative discriminant rules (excluding the analyzed data). Predictors tested were edaphic (texture, pH, organic matter) and topographic (altitude and slope) variables. The model obtained allow to discriminate poorest sites accurately (100% of sites were correctly re-classified using the discriminant functions obtained). In more productive areas, sites were correctly re-classified in the 33.33% of cases, while in intermediate sites the correct classification was equal to 50%. Our discriminant rule classifies correctly the poorest stands, suggesting that site index in plain site soils strongly depends on clay percentage. Overall, the edaphic model obtained classifies plots into the correct site index class 61.11% of cases, which is considered an acceptable value for these kinds of studies.
Keywords
Clay, Pinus pinea, Site index, Site productivity, Topographic factor
Authors’ Info
Authors’ address
Sustainable Forest Management Research Institute, University of Valladolid-INIA, avda. de Madrid 57, E-34004 Palencia (Spain)
R Mercurio
M Sidari
A Muscolo
Department of Agricultural and Forest Systems Management, Faculty of Agriculture, University “Mediterranea” (Italy)
Corresponding author
Paper Info
Citation
Bravo F, Lucà M, Mercurio R, Sidari M, Muscolo A (2011). Soil and forest productivity: a case study from Stone pine (Pinus pinea L.) stands in Calabria (southern Italy). iForest 4: 25-30. - doi: 10.3832/ifor0559-004
Paper history
Received: May 03, 2010
Accepted: Dec 17, 2010
First online: Jan 27, 2011
Publication Date: Jan 27, 2011
Publication Time: 1.37 months
Copyright Information
© SISEF - The Italian Society of Silviculture and Forest Ecology 2011
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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