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The water storage capacity of 10 typical soils on abando - ned fields in five test areas along a transect from the High Pyrenees to the Central Ebro Basin is related to precipitation and potential evapotranspi- ration. The annual precipitation increases from 300mm in the Central Ebro Depression to 1700mm in the subalpine area, the potential evapo- transpiration decreases from 920 mm to 650 mm. However in the High Pyrenees, months with a negative water balance are frequent. For a period of 6 years (1994-1999) the potential soil water balance was calculated on the base of physical soil properties and climatic data in daily intervals. The results show several periods with a very low content of plant available water in all test areas. They last for up to 8 months in the Central Ebro Basin and 2 weeks in the high mountain region. Beside grazing and soil erosion, the limitation of plant available water is a major reason for a slow vegetation succession on abandoned fields. RESUMEN: La capacidad de almacenamiento de agua en 10 suelos de campos abandonados en un transecto de los Pirineos a la Depresion del Ebro se relaciona con la precipitacion y la evapotranspiracion potencial. La precipitacion anual aumenta desde 300 mm en la Depresion del Ebr o hasta 1700 mm en la zona subalpina, y la evapotranspiracion potencial disminuye desde 920 a 650 mm. Sin embargo, en el alto Pirineo es fr e - cuente la existencia de meses con balance hidrico negativo. Para un perio - do de 6 anos (1994-1999) el balance hidrico potencial del suelo se calcu- lo sobre la base de las propiedades fisicas del suelo y de datos climaticos diarios. Los resultados muestran varios periodos con muy bajo contenido de agua disponible para las plantas en todas las areas estudiadas, llegan- do a 8 meses en la Depresion central del Ebro y 2 semanas en la alta mon - tana. Ademas del pastoreo y la erosion del suelo, la limitacion de agua dis - ponible es la prinicpal razon de una sucesion vegetal lenta en los campos abandonados.

The water balance of different soils on abandoned fields along a transect from the High Pyrenees to the Central Ebro Basin