Resumen

ROSAS CHAVOYA, Marcela; GRANADOS SANCHEZ, Diódoro; GRANADOS VICTORINO, Ro Linx  y  ESPARZA GOVEA, Salvador. Classification and ordination of pinyon pine forests of Querétaro State. Rev. mex. de cienc. forestales [online]. 2016, vol.7, n.33, pp.52-73. ISSN 2007-1132.

The Queretanian desert, particularly that part within the Sierra Gorda, includes an area with the greatest abundance of pinyon pines in Mexico. The study here described was carried out in 14 locations of this kind of forests with the aim to make the structural and floristic characterization as well as to establish a relationship between the structure and the species composition with their physical environment. Seasonal samplings were performed from June 2013 to June 2014 and 2 000 m long walk rounds by location were made; thus annual and perennial herbs, shrubs and trees were collected and identified. Results show the existence of three taxa that belong to this group: P. cembroides, P. cembroides var. bicolor and P. pinceana; which, together with Juniperus flaccida make up four different associations of dominance and codominance, each one with different degrees of floristic similitude, which were defined by a cluster analysis. The ordination by a correspondence canonical analysis suggests that the variables that govern the floristic composition and the ecological groups have a multifactorial origin of variables where the most outstanding which affect their establishment were the organic matter, slope and altitude. Of the three taxa in record in Querétaro State, P. pinceana is the only one considered in the NOM-059 regulation and has been classified as endangered species.

Palabras llave : Canonical Correspondence Analysis; plant association; plant composition; plant community; forest structure; Pinus cembroides Zucc.