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University of Arizona (1973)

An application of the Holdridge life zone model to the Arizona landscape

Ballard, Donna Jean

Titre : An application of the Holdridge life zone model to the Arizona landscape

Auteur : Ballard, Donna Jean,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1973

Résumé
The Moldridge life zone classification, a relatively new climate Classification, was developed In the tropics and has seldom ’been applied to arid or non-troplcal regions. In this study, the classification was applied to the diverse Arizona landscape to test the applicability of the system In an arid-semiarid, subtropical area. A life zone map of the state, based on the Holdrldge classifica tion, was compiled with the aid of a computer mapping program and com pared to climate and vegetation maps of the state produced by other authors. In addition, such facets of the classification as the biotem perature, critical temperature line, lapse rate, the calculation of PE, and the humidity province, as well as the Holdrldge methodology, were evaluated. The classification was not found to be significantly more meaningful than its predecessors, and the mapped life zones did not Correlate well with Arizona’s vegetation. PE determined by the Holdrldge method was too low for use in arid climates. The principal drawback to the use of this classification was the lack of clear definitions, which made the classification difficult to "master" and rendered one of the concepts meaningless.

Mots clés : Climatic classification — Arizona. ; Arizona — Climate.

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