Strategies for classification and management of native vegetation for food production in arid zones =

In 1981, the USDA Forest Service and SARH Sub-secretaria Forestal de Mexico signed a plan of cooperation to exchange information to improve the professional and technical capabilities of scientists in both countries. The plan included sponsorship of symposia, the first of which was held in Saltillo Mexico in 1985.

"Strategies for Classification and Management of Native Vegetation for Food Production in Arid Zones" was the second symposium held October 12-16, I98T at Tucson, Arizona. Papers were presented during this three day meeting with one day devoted to a field trip to the Santa Rita Experimental Range and the Walnut Gulch Experimental Watershed. Over 130 scientists, technicians, and administrators attended the symposium. This General Technical Report includes papers presented in the language of the author (English or Spanish) with a summary at the end of the proceedings in the other language.

International meetings require considerable preparation and the involvement of many people. Recognition for the successful symposium in Tucson must be given to Avelino B. Villa-Salas and Heriberto ParraHake from the Instituto Nacional de Invest igaciones Forestales Y Agropecuarias, and George Garcia, Bob Partido, Reggie Fletcher, Bob Hamre, and Liz GarciaSanchez from the USDA Forest Service. All the papers presented represent the opinion of individual authors, who were responsible for their own peer review, manuscript preparation, and editing.

Earl F. ALDON, CARLOS GONZALES, AND WILL MOIR, Co-Editors.

Keynote Address PALABRAS DE APERTURA Halophytic Food Crops for Arid Lands 1 The Importance of Native Plants to Food Production in Mexico (251)

Carlos E. Gonzalez Vicente Arid Land Classification CLASIFICACION DE ZONAS ARIDAS An Ecological Approach to Classifying Semiarid Plant Communities 9 Richard E. Francis and Earl F. Aldon A Hierarchical Classification of Landforms: Some Implications for Understanding Local and Regional Vegetation Dynamics 15 Steven M. Wondzell, Gary L. Cunningham, and Dominique Bachelet A Forest Habitat Type Classification of Southern Arizona and Its Relationship to Forests of the Sierra Madre Occidental of Mexico 24 CLASIFICACION DE UN TIPO DE HABITAT FORESTAL EN EL SUR DE ARIZONA Y SU RELACION CON LOS BOSQUES DE LA SIERRA MADRE OCCIDENTAL DE MEXICO (245) Esteban H.

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