Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : THE USE OF LARGE SCALE COLOR AERIAL PHOTOGRAPHY TO MONITOR CATTLE GRAZING IN MESQUITE GRASSLANDS, SOUTHERN ARIZONA

Auteur : Hui, Lin Ning.

Université de soutenance : University of Arizona

Grade : Master of Arts (MA) 1986

Résumé
This project focuses on evaluating the use of aerial photography to examine patterns of cattle grazing of Lehmann lovegrass around mesquite trees on the Santa Rita Experimental Range. Field data were obtained in April and June 1985, from two pastures and a protected exclosure having different histories of grazing. Photointerpretation was conducted using large scale (from 1:600 to 1:1200) color aerial photographs taken at the same time as ground measurements were made in the field. This study varifies a pattern of circular areas of heavy grazing beneath and adjacent to mesquite trees in this study area. The sizes of these " mesquite rings" vary with season and grazing intensity. Mesquite rings are easily detectable and can be monitored reliably through use of large scale color aerial photographs. viii

Mots clés : Grazing — Arizona. ; Aerial photography in geography. ; Cattle — Arizona. ; Rangelands — Arizona.

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