Formaciones edáficas del tramo alto de la cuenca del río Lillas

The study about formation of unstable soils that has been developed in a low grade, formed from metamorphics rocks (slates, schists, quartzites) under beechs, oaks, heathers and meadows, in a warm-cold weather, with rains over 1.000 mm, in many diferents slopes, and between 1.300 m and 1.700 m. of highness. The best represented groups of soils are: Leptosols, Regosols, Podzols and Cambisols; with acid pH and, normally, unsatured. In these soils the main changeable cations are Ca2+ and Mg2+; they have sandly textures and high contents in organic matter. These soils are really limited,, it is higly recommendable to protect them.