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Mediterranean mountain areas show during the twentieth century intense revegetation processes, mainly characterised by the advance of forests and shrubs. This is explained by land abandonment and the noticeable decrease of the livestock pressure on the pastures. This paper analyses the influence of some physical and human factors on the intensity and spatial patterns of the reve- getation processes in the Borau valley (Central Spanish Pyrenees) between 1957 and 2000. About 45% of the study area showed important modifications in the vegetation cover. The succession processes toward more mature vegetation stages are dominant (41.5%). On the contrary, the retreat toward less mature vegetation stages affects small sectors (3.5%). Low and middle slopes covered by abando- ned fields were the areas in which the main changes were observed. Nevertheless,

Factores en la variabilidad espacial de los cambios de cubierta vegetal en el Pirineo