Contributors: Padilla-Martínez, Jaime Roberto; Paul, Carola; Corral-Rivas, José Javier; Husmann, Kai; Diéguez-Aranda, Ulises; Gadow, Klaus von; Thomas, Frank M.; orcid:0000-0003-3511-2478; orcid:0000-0002-6257-2026; orcid:0000-0003-2970-4709; orcid:0000-0003-3641-0397; 1Department of Forest Economics and Sustainable Land-Use Planning, Faculty of Forest Sciences and Forest Ecology, University of Göttingen, Büsgenweg 1, 37077 Göttingen, Germany; 2Facultad de Ciencias Forestales, Universidad Juárez del Estado de Durango, Río Papaloapan y Boulevard Durango S/N, Durango 34120, Mexico; 3Unidad de Gestión Ambiental y Forestal Sostenible, Departamento de Ingeniería Agroforestal, Escuela Politécnica Superior de Ingeniería, Universidad de Santiago de Compostela, Benigno Ledo s/n, Campus Terra, 27002 Lugo, Spain; von Gadow, Klaus; 4Faculty of Forestry and Forest Ecology, Georg-August-Universität, Büsgenweg 5, 37077 Göttingen, Germany
نبذة مختصرة : Even though the site index is a popular method for describing forest productivity, its use is limited in uneven-aged multispecies forests. Accordingly, the site form (SF) is an alternative measure of productivity to the site index based on the tree height–diameter relationship. Our study aims to evaluate SF as a measure of productivity in the temperate uneven-aged multispecies forests of Durango, Mexico, applying three methods to estimate SF: (i) as the mean height of dominant trees at a reference diameter (SFH-D); (ii) as the expected mean height of dominant trees at a reference mean diameter (SFMH-MD), and (iii) as the expected height at a reference diameter for a given site (SFh-dbh). We assess the effectiveness of the SF based on two hypotheses: (i) the SF correlates to the total volume production, and (ii) the SF is independent of stand density. The SFH-D and the SFh-dbh showed a high correlation with productivity. However, they also did so with density. Contrary to this, the SFMH-MD had a weak correlation with density and productivity. We conclude that the SF is a suitable approach to describe site quality. Nonetheless, its effectiveness as a site quality indicator may be affected according to the method used. ; The National Forestry Commission of Mexico and the Mexican National Council for Science and Technology
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