RT Journal Article
T1 Modelling diameter distributions of Quercus suber L. stands in “Los Alcornocales” Natural Park (Cádiz-Málaga, Spain) by using the two parameter Weibull functions
A1 Calzado Carretero, Anabel
A1 Torres Álvarez, Enrique
AB Aim of study: The aim of this work was to model diameter distributions of Quercus suber stands. The ultimate goalwas to construct models enabling the development of more affordable forest inventory methods. This is the firststudy of this type on cork oak forests in the area.Area of study: The area of study is “Los Alcornocales” Natural Park (Cádiz-Málaga, Spain).Material and methods: The diameter distributions of 100 permanent plots were modelled with the two-parameterWeibull function. Distribution parameters were fitted with the non-linear regression, maximum likelihood, momentand percentile-based methods. Goodness of fit with the different methods was compared in terms of number of plotsrejected by the Kolmogorov-Smirnov test, bias, mean square error and mean absolute error. The scale and shape parametersin the Weibull function were related to the stand variables by using the parameter prediction model.Main results: The best fitting was obtained with the non-linear regression approach, using as initial values thoseobtained by maximum likelihood method, the percentage of rejections by the Kolmogorov-Smirnov test was 2% of thetotal number of cases. The scale parameter “b” was successfully modelled in terms of the quadratic mean diameterunder cork (R2adj = 0.99). The shape parameter “c” was modelled by using maximum diameter, minimum diameter andplot elevation (R2adj = 0.40).Research highlights: The proposed model diameter distribution can be a highly useful tool for the inventorying andmanagement of cork oak forests.
PB Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)
SN 2171-5068
SN 2171-9845 (electrónico)
YR 2013
FD 2013
LK http://hdl.handle.net/10272/11127
UL http://hdl.handle.net/10272/11127
LA eng
NO Calzado Carretero, A., Torres Álvarez, E.: "Modelling diameter distributions of Quercus suber L. standsin “Los Alcornocales” Natural Park (Cádiz-Málaga, Spain) by usingthe two parameter Weibull functions". Forest Systems. Vol. 22, n. 1, págs. 15-24 (2013). DOI 10.5424/fs/2013221-02142
DS Repositorio Institucional de la Universidad de Huelva
RD 15 jul 2026