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Accueil du site → Master → Etats Unis → 1971 → Perennial vegetation associated with the organpipe cactus in Organ Pipe Cactus National Monument, Arizona

University of Arizona (1971)

Perennial vegetation associated with the organpipe cactus in Organ Pipe Cactus National Monument, Arizona

Mulroy, Thomas Wilkinson

Titre : Perennial vegetation associated with the organpipe cactus in Organ Pipe Cactus National Monument, Arizona

Auteur : Mulroy, Thomas Wilkinson

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1971

Résumé
The perennial plant species associated with the organpipe cactus were studied in nine 0.1 hectare quadrats placed in habitats representative of organpipe populations in Organ Pipe Cactus National Monument, southwestern Arizona. The species present and their percent coverage in each quadrat were determined. Results of mechanical, moisture tension, and pH analyses are reported for surface soil samples from each quadrat. The vegetation associated with the organpipe varied in composition depending on soil parent material, slope exposure, and topographic position of the quadrat. The soils, characterized by coarse texture, low moisture retentivity, and a slightly alkaline pH, were relatively homogenous from quadrat to quadrat, and were similar in these respects to soils from other paloverde associations within the Southwestern Desertscrub Formation. The organpipe was best represented on slopes having a southerly exposure. The analysis of the flora associated with the organpipe cactus in this area of southwestern Arizona reveals the overall desertscrub community to be characterized by over 90 perennial plant species, the majority of which are distributed primarily southward into Latin America and terminate their northward continental distribution at or shortly beyond the northern limit of the organpipe cactus in Pima County, Arizona.

Mots clés : Desert plants. ; Cactus — Arizona. ; Botany — Arizona.

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Page publiée le 12 novembre 2015, mise à jour le 15 décembre 2017