Abstract

RUIZ-AQUINO, Faustino et al. Spatial distribution of two oak species and ecological attributes of pine-oak woodlands from Ixtlán de Juárez, Oaxaca. Rev. Chapingo ser. cienc. for. ambient [online]. 2015, vol.21, n.1, pp.67-80. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2014.05.023.

The structure and diversity of pine-oak woodlands in Ixtlán de Juárez, Oaxaca, was analyzed using three sampling units (SU) of 50 x 50 m. The spatial distribution of trees with normal diameter ≥ 2.5 cm was determined. Dasometric variables were recorded; two indices of structural importance (the Relative Importance Value Index [RIVI] and the forest value index [FVI], and three diversity indices (Shannon-Wiener Entropy Index, effective number of diversity, and Sorensen index) were calculated. A total of 799 trees were recorded, belonging to 11 families and 19 species; the most abundant family was Fagaceae (628 individuals, four species). In SU1, the most important species was Quercus crassifolia (RIVI = 53; FVI = 57). The highest values of RIVI and FVI in SU2 were for Q. laurina (RIVI = 48, FVI = 63). In SU3, the most important species was Q. crassifolia (RIVI = 49, FVI = 62). The analysis of both species revealed random distribution in practically all distances. The aggregate pattern of tree species was attributed to regeneration strategies and silvicultural practices. Both species can coexist modifying the structural importance and horizontal distribution pattern.ment of arsenic-contaminated water and soils in the region using native bacterial strains.

Keywords : Quercus laurina; Quercus crassifolia; species diversity; relative importance value index.