Abstract

LUNA ROBLES, E.O.; CANTU SILVA, I.  and  YANEZ DIAZ, M.I.. Effects of forest management on composition and diversity of natural tree regeneration in forests of the Sierra Madre Occidental. Polibotánica [online]. 2020, n.50, pp.19-30.  Epub Nov 25, 2020. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.50.2.

With the objective of evaluating the composition and diversity of species of natural regeneration in temperate forests of the Sierra Madre Occidental, eight study sites (4 m2) were established at random within managed forest stands with the methods of Seed-trees, Group selection and compared to a stand of Reference (control), in total, 24 sampling sites were recorded, where the variables recorded height (m), neck diameter (cm) and crown area (m2). The importance value index (IVI) was determined, as well as the diversity and species richness using the Shannon-Wiener (H´) and Margalef (DMg) indices, respectively. Similarity was obtained with the Sorensen index. In total, 5 species of natural regeneration were registered, belonging to 3 genera and 3 families, where the Pinus genus was mostly represented by three species. In the Reference and Groups selection stands, the species with the highest abundance was Pinus durangensis (10,000 and 20,000 Ind / ha, respectively), while Quercus sideroxyla was for the area of Seed-trees (21,250 Ind / ha). The Shannon (H´) and Margalef (DMg) index considers regeneration to be of low diversity, while the results of the similarity analysis indicate that the Reference and Group selection stands have 75% in common, while the area of Seed-trees showed slightly lower similarity (64%). The present study establishes references for forest management based on the specified ecological parameters.

Keywords : Temperate forests; Seed-trees; Group selection; diversity indices; forest management.