Zaragoza, España
Se estudian los usos y cambios de uso de las parcelas y la superficie de los prados de siegaentre los años 1957, 1986 y 2016 de un valle del Pirineo. La cartografía de los polígonos serealiza a partir de la fotografía aérea de una superficie total de 5350 ha. La superficie deprados pasa de 1568,4 ha a 1703,5 ha y a 1086,7 ha en los años de referencia. Esto suponeun aumento del 9% y una reducción del 36% respectivamente. En ambos periodos hayincrementos y decrementos de parcelas de prados por cambios de uso. Entre 1957 y 1986el incremento mayoritario es por cambio de cultivo a prado y el decremento por cambio deprado a pastos, bosques, embalses y urbanización. Entre 1986 y 2016 el incremento esirrelevante y el decremento es por cambio a bosque, urbanización y pastos.
Land-use changes were studied in hay meadow plots between 1957, 1986 and 2016 in aPyrenean valley. Aerial photographs covering 5350 ha were used to elaborate thecartography of the polygons analyzed. The meadows area changed from 1568.4 ha to1703.5 ha and to 1086.7 ha through the years studied. Those changes imply an increase of9% and a decrease of 36% of the meadows area, respectively. Increases and decreases ofthe meadow plots area were found in both time periods, due to land-use changes. Mostarea increases between 1957 and 1986 were due to changes from crops to meadows. Mostarea decreases were due to changes from meadows to pastureland, forests, waterreservoirs, and to urbanization. The area increase between 1986 and 2016 was irrelevant,while the area decrease was due to changes from meadows to forests, urbanization and topastureland.
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