Abstract
Research and discussion regarding the causes of historic vegetation change are important to potential policies and prescriptions for addressing problems related to environmental change. This paper examines the case of southeastern Arizona where significant historic vegetation change has occurred. Using repeat aerial photography covering a period of approximately 50 years, the analysis considers the two primary hypotheses for vegetation change in the region: climate, and land use. Subsequent to a brief review of these hypotheses and the methods employed to explore them, the paper looks at two sites in Arizona and analyzes the direction and cause of vegetation change. From both this analysis and a description of historical land uses in the area, evidence is presented that land use and not climate change is the primary driver of historical vegetation in the areas.
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