Abstract
GALLEGO FERNANDEZ, J.B. (2003). Shrubland species distribution in acid and basic soils at Grazalema Mountains, South Spain. Anales Jard. Bot. Madrid 60( 1): 51 -61 (in Spanish). The presence of Mediterranean shrubland woody species on acid or basic soils was studied at Grazalema Mountains. Transects were made at 137 sampling sites in the study area and 74 species were recognized. Phlomis purpurea. Cistus albidus. Quercus rotundifolia and Ulex baeticus were the most frequent species, being present at 70 % of the transects. Pistacia lentis cus. Rubia peregrina and Daphne gnidium were found in 50 % of the transects. From the total species recorded, 67 species were located on basic soils and 55 on acid soils; 19 species (25.7 %) were located only on basic soils and 7 species (9.5 %) only on acid soils; 21 species were significantly more frequent on basic soils, and 10 species on acid soils. The number of species per transect were significantly higher on basic soils (13.2 ± 3.8) than on acid soils (10.3 ± 3.7). Differences in species number are related to a higher number of species displaying a narrow distribution in the basic shrublands as well as due to species loss in the acid shrublands, as a consequence of geographic isolation and human disturbance.
Highlights
The presence of Mediterranean shrubland woody species on acid or basic soils was studied at Grazalema Mountains
Este patrón ha sido también descrito para matorrales del S de España, si bien existen importantes diferencias en los resultados y conclusiones, debido tanto a la escala espacial de los trabajos (ARROYO & MARAÑÓN, 1990) como a las características geológicas y edáficas del área estudiada (OJEDA & al., 1995)
Las principales comunidades leñosas que aparecen en el área de estudio son formaciones de pinsapar, quejigar, encinar y acebuchar, cuyo sotobosque varía en función del tipo de intervención humana que han tenido; matorrales altos dominados por Pistacia lentiscus, Juniperus phoenicea, J. oxycedrus o Arbutus unedo, y matorrales bajos, dominados bien por Ulex baeticus, bien por Cistus al
Summary
El Parque Natural de la Sierra de Grazalema, localizado entre los paralelos 36°51'N y 36°36'N y los meridianos 5°32'W y 5°12'W, forma parte de la Sierra Norte de la provincia de Cádiz. Se pueden distinguir dos pisos bioclimáticos (RIVAS MARTÍNEZ, 1983): a) termomediterráneo, que comprende desde las zonas más bajas hasta aproximadamente los 900 m, con táxones característicos como Smilax aspera, Chamaerops humilis. Las principales comunidades leñosas que aparecen en el área de estudio son formaciones de pinsapar, quejigar, encinar y acebuchar, cuyo sotobosque varía en función del tipo de intervención humana que han tenido; matorrales altos dominados por Pistacia lentiscus, Juniperus phoenicea, J. oxycedrus o Arbutus unedo, y matorrales bajos, dominados bien por Ulex baeticus, bien por Cistus al-. Todas las formaciones vegetales del Parque Natural, y por tanto del área de estudio, han sido sometidas a intervención humana, que en mayor o menor grado ha modificado la composición y abundancia de las especies de plantas
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