Resumen

DELGADO ZAMORA, David Alfredo et al. Tree diversity and structure of two stands in Pueblo Nuevo, Durango. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.33, pp.94-107. ISSN 2007-1132.

This study describes the structure and diversity of tree species in two stands with pine-oak temperate forests, located in the Chavarría Nuevo ejido of the community of Coscomate, in the municipality of Pueblo Nuevo, Durango. The vegetation was sampled using the method of four quadrants around a point. The structural parameters of dominance, frequency and dominance were estimated and used to determine the Importance Value Index for the tree taxa in each site; a diametric distribution histogram was obtained using the Weibull function. The diversity was estimated using the Shannon-Wiener index. The Euclidean distance was utilized to calculate the floristic similarity between the sites. 13 tree species belonging to five genera and five botanical families were recorded. The structural characteristics of the vegetation evidence that the vegetation of stand 1 is dominated by Pinus cooperi with scarcely any other tree species, while stand 2 shows a larger diversity, with a predominance of P. durangensis. Furthermore, this is the stand with the highest diversity (H'= 1.07 a 1.58). There is a low similarity between the two sites, despite their closeness and despite the fact that they are located at similar altitude intervals -an example of the ecological complexity of the Western Sierra Madre.

Palabras llave : Arbutus; temperate forest; Juniperus blancoi Martínez; Pinus; Quercus; Western Sierra Madre.