Bases para la tipificación integrada de los pastizales de dehesa

Rational use of seminatural rangeland requires integrated surveys and tipification. These rely upon a synthesis of characteristics of the geosystems underlying such natural complexes. Although there are different possible procedures, it is important that integrated typolo- gies reflect the most important geosystemic features, according to funcional, structural and genetic criteria. Homologies should clearly appear even when floristically unrelated áreas are considered (Mediterranean, California, Australia, etc.). Integration criteria specified by four dimensions or aspects are described. These have been rried by the authors in rangeland áreas of Center and the Southwest of the Iberian Península and are: Equipotenciality (zonality): related to position in gradients, altitudinal zones, northern and southern slopes, radiation patterns. Vectoriality: related to position in the dynamical system of interfluve and channel and slope dynamics. Mosaicity (azonality, cellularity): appartenence to roughly isodiametric patterns superposed to the forms and uncorrelated with them. Successional dinamicity: related to succesional changes normally conditioned by range management. Most of the differentiated features tend to recur within the landscape thus facüitating survey and mapping