CLASIFICACIÓN DE SUELOS EN PASTOS ALPINOS DE AÍSA Y ORDESA (PIRINEO CENTRAL)

D. BADÍA VILLAS*, R. GARCÍA-GONZALEZ**, C. MARTÍ  DALMAU*

* Escuela Politécnica Superior de Huesca, Crtra. Cuarte s/n. 22071-HUESCA
** Instituto Pirenaico de Ecología-CSIC, Avda. Rgto. Galicia, 19. 22700-JACA

Abstract

The soils of five grassland communities in Aísa and Ordesa uplands (Central Pyrenees) are classified by the World Reference Base of Soil Resources system (WRB) and Soil Taxonomy System (STS): Bromion erecti, Nardion estrictae, Festucion eskiae and Primulion intricatae (developed on calcilutites) and Festucion gautieri (developed on hard limestones). The soils of the Nardion strictae and Festucion eskia communities are strongly acidic, desaturated and with a high organic matter content; they are classified as Humic Umbrisols by WRB (Humic Dystrocryepts by STS). The soils of the Bromion erecti and Primulion intricatae, with higher pH and base saturation than the previous ones, are classified as Phaeozems (haplic, pachic or calcaric) by WRB system (Humic Eutrocryepts or Humic Dystrocryepts by STS). The soil of the Festucion gautieri community has a neutral o basic pH, a complete base saturation and low water retention capacity; as well as scarce and irregular depth which modify its classification
between Humic Leptosols and Lepto-humic Regosols by WRB (Lithic Cryorthent by STS).

Key words: soil classification, high mountains, grassland-soil relationships.