La expansión del quejigo (Quercus faginea) en el Prepirineo Aragonés durante la segunda mitad del siglo XX

The expansion of Quercus faginea Lam. -due to a decrease in human pressure- was investigated in seven municipalities of the Aragon’s Pre-Pyrenees over the second half of the twentieth century. The rural emigration that occurred in this area since 1960s has generated a massive abandonment of agricultural lands and a decrease in livestock pressure. As a result, some abandoned fields have been colonized by Q. faginea; specially, in the municipalities that have known a marked decrease in the numbers of farmers and livestock. With the continued decrease of human pressure in the territory, it is expected that Q. faginea will colonize new areas during the next years as a result of secondary succession.