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Summary — Water and several bioelement balances were established for four Quercus pyrenaica forests along a pronounced pluviometric gradient, located in the Sierra de Gata mountains (central Spain), to obtain information on the effect of rainfall on annual and summer evapotranspiration, on nutrient leaching from the soils and on the evolution of fertility.

The acid phosphatase activity (APA) is a key factor in phosphorus (P), mineralization, P nutrition of plants, and P cycling. However, the widely used method of Tabatabai and Bremner for APA determinations is seriously restricted in soils with high organic matter contents, owing to interference in photometric detection by dissolved organic matter. The objectives of this study were: A) to modify the procedure of Tabatabai and Bremner with a view to its application to forest soils rich in organic carbon, b) to determine APA contents in forest soils of the Sierra de Gata mountains, and c) to establish relationships between the APA with different soil parameters. The modified procedure was well

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