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VÍCTOR LÓPEZ-GÓMEZ, PAULINA ZEDILLO-AVELLEYRA, SOONYOO ANAYA-HONG, ENRIQUE GONZÁLEZ-LOZADA, ZENÓN CANO-SANTANA

Abstract


Slope orientation modifi es fi eld microclimatic conditions. Despite this well-known pattern, there is few empirical evidence of its infl uence on plant populations, and even lesser for cactus populations. Our goals were to determine the effect of N and S slope orientation on some population attributes (total stem area, density and size structure) and ecomorphology (number branch and orientation) of Neobuxbaumia tetetzo (Cactaceae) taller than 1.5 m in Valle de Zapotitlán, Puebla. In southerly slope, N. tetetzo showed higher density and a higher tendency of branches to northeast orientation than N. tetetzo in northerly slope. In the northern slope cacti had a higher number of branches than in the southern one. We conclude that slope orientation showed a remarkable effect on density, size structure, and ecomorphology of N. tetetzo; nevertheless, it is needed to obtain microclimatic records at the study site to clarify our understanding about slope orientation effect on N. tetezo population.

Keywords


branch orientation; density; giant columnar cactus; size structure

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DOI: http://dx.doi.org/10.17129/botsci.473

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ISSN: 2007-4476
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