Resumen

LOPEZ-PALACIOS, L.M.; FORTANELLI-MARTINEZ, J.; FLORES-FLORES, J.L.  y  GARCIA-PEREZ, J.. Analysis of the vegetation cover in the topographic gradient of the crater La Joya Honda San Luis Potosí. Polibotánica [online]. 2018, n.46, pp.119-137. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.46.6.

The distribution of the vegetation cover in the topographical gradient of the crater Joya Honda was analyzed; this site is located at the municipality of Soledad of Graciano Sánchez, San Luis Potosí, México. It is a volcanic structure of type maar, with an elliptical circumference and two contrasting areas: a suntrap zone located at North part and a shaded zone placed at south sector. During the field work botanical specimens were collected. Along three belts of the topographic gradient of the crater 33 plots were established. In each one, the cover of trees and shrubs was registered; the data were analyzed with multivariable ordination methods (DECORANA program) and classification (TWINSPAN program). A total of 87 species, corresponding to 67 genera and 30 botanical families were recorded. The ordination analysis shows a distribution pattern of plant species mainly associated with their topographic location, and secondly with the slope orientation. The classification analysis confirms the last statement. The observed patterns show the importance, in the section with steep slopes of Gochnatia hypoleuca and Helietta parvifolia. At the piedmont, Opuntia leucotricha, Opuntia streptacantha, Celtis pallida and Prosopis laevigata are predominant. The flat part of the center of the landform presents one open scrubland of P. laevigata and Maytenus phyllanthoides with Atriplex canescens, Koeberlinia spinosa y Cylindropuntia imbricata.

Palabras llave : maar; zonation; plant communities.

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