Abstract

BARRIOS-CALDERON, Romeo de Jesús; PEREZ PEREZ, Javier Ernesto; TORRES VELAZQUEZ, Jony Ramiro  and  AGUIRRE-CADENA, Juan Francisco. Structure and floristic composition of a Pinus-Quercus forest in El Porvenir, Chiapas State. Rev. mex. de cienc. forestales [online]. 2022, vol.13, n.73, pp.50-74.  Epub Oct 10, 2022. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v13i73.1252.

Pinus-Quercus forests are ecosystems of great ecological importance. Structure and composition are indicators of biodiversity in these forest associations, being two key elements for their stability and conservation. The objective of this study was to characterize a Pinus-Quercus forest based con the structural parameters and species composition present in the arboreal stratum in the municipality of El Porvenir, Chiapas. Six 400 m2 circular sites were established to evaluate the adult trees and their dasometric variables (total height, normal diameter and cover). The structural parameters of the forest (density, dominance, basal area and cover) were used to calculate the indexes of Importance Value, forest value, Holdrige complexity index and similarity index. The results showed the presence of six species; Pinus maximinoi exhibited a mean height of 18.88±6.72 m (p<0.0001, F= 5.46), which is greater than that of other species. In addition, it has the highest normal diameter (30.58±13.64 cm, p<0.0002, F=5.18), Importance Value (161.07 %) and forest value (108.08 %). The Holdrige complexity index of the forest is 45.22 %. The results obtained made it possible to identify the dimensions, structural parameters, and dominance of the species, with Pinus maximinoi being the most valuable.

Keywords : Forest arrangement; pine-oak forest; Sørensen's index; Holdrige complexity index; tree density; forest value index.

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