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University of Arizona (1971)

Modern pollen distribution as related to vegetation communities and elevation in the Grand Canyon, Arizona

Sigleo, Wayne R.

Titre : Modern pollen distribution as related to vegetation communities and elevation in the Grand Canyon, Arizona

Auteur : Sigleo, Wayne R.

Université de soutenance : University of Arizona

Grade : Master of Arts (MA) 1971

Résumé
Twenty-five surface soil samples were collected and analyzed for their pollen content from a traverse across the Grand Canyon, Arizona. In an attempt to relate the modern pollen distribution to the vegetation in the Canyon, five principal vegetation communities were described ranging from a mixed coniferous forest (elev. 2515 m) to a desert shrub community (elev. 760 m) near the Colorado River. The modern pollen distribution of most major plant communities is distinctive despite the over-representation of wind-blown coniferous pollen, especially Pirns, at lower elevations in the Canyon. The woodland and forest communi ties are characterized by greater than 50 percent Pinus pollen. Relatively high frequencies of Compositae and Ephedra pollen dominate the desert shrub community.

Mots clés : Botany — Arizona — Grand Canyon. ; Pollen. ; Grand Canyon (Ariz.)

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Page publiée le 12 juillet 2018