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Effect of Slope and Aspect on the Associated Flora of Pinyon Pines in Central Mexico
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Effect of Slope and Aspect on the Associated Flora of Pinyon Pines in Central Mexico
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Effect of Slope and Aspect on the Associated Flora of Pinyon Pines in Central Mexico
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Journal Article
Effect of Slope and Aspect on the Associated Flora of Pinyon Pines in Central Mexico
2012
Overview
To test the hypothesis that Mexican pinyons (Pinus cembroides) and Johannis pines (P. johannis) grow under different environmental conditions, the flora associated with both species was sampled along two 20-m perpendicular transects at 40 sites. Patterns were analyzed with the two-way-indicator-species program, which yielded six groups with Mexican pinyons dominating xeric sites and Johannis pines dominating mesic sites. Other groups of species corresponded to transition from mesic to xeric sites. We used canonical-correspondence analysis to explore the effect of slope and aspect on species and indirectly related them to an underlying moisture gradient. The first ordination axis indicated that aspect explained 59% of the variation, and the second axis, representing slope, explained 41%. Para probar la hipótesis de que los piñoneros mexicanos (Pinus cembroides) y los piñoneros Johannis (P. johannis) crecen bajo diferentes condiciones ambientales, se muestreó la flora asociada a ambas especies a lo largo de dos transectos perpendiculares de 20 m en 40 sitios. Los patrones se analizaron con el programa TWINSPAN, el cual produjo seis grupos, con dominancia del piñonero mexicano en sitios xéricos, y del piñonero Johannis en sitios mésicos. Otros grupos de especies correspondieron a los sitios de transición mésicos a xéricos. Usamos Análisis Canónico de Correspondencias para explorar el efecto de la pendiente y la orientación sobre las especies y relacionarlas indirectamente con un gradiente subyacente de humedad. El primer eje de ordenación indicó que la exposición explicaba el 59% de la variación, y el segundo eje, el cual representa la pendiente, explicaba el 41%.
