Research Article

Modelling dominant height growth in plantations of Pseudotsuga menziesii (Mirb.) Franco in Spain

Published in: Southern Forests: a Journal of Forest Science
Volume 77 , issue 4 , 2015 , pages: 315–319

DOI: 10.2989/20702620.2015.1077417

Author(s): Carlos A López-Sánchez Instituto de Silvicultura e Industria de la Madera, México , Juan G Álvarez-González Departamento de Ingeniería Agroforestal, Escuela Politécnica Superior, Spain , Ulises Diéguez-Aranda Departamento de Ingeniería Agroforestal, Escuela Politécnica Superior, Spain , Roque Rodríguez-Soalleiro Departamento de Producción Vegetal, Escuela Politécnica Superior, Spain

Keywords: Bertalanffy–Richards model , Douglas fir , generalised algebraic difference approach , site quality

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Abstract

A model for predicting dominant height growth and site index of Pseudotsuga menziesii (Mirb.) Franco in Spain was constructed. Data from stem analysis of 117 site trees were used. Four dynamic equations using the algebraic difference approach (ADA) and its generalisation (GADA), which have provided good results in previous studies, were evaluated. The model parameters were estimated with the base‑age‑invariant method of dummy variables, which considers both global (common to all sites) and local parameters (specific to each site). A GADA equation based on the Bertalanffy–Richards base model yielded the best results. The model provides polymorphic curves with multiple asymptotes. A base age of 20 years is proposed to reference site index.

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