The Intensive Monitoring of Forest Ecosystems (ICP-Forests Level II network) consists currently in 14 monitoring plots representing important Spanish Forest Ecosystems distributed throughout the Spanish mainland showing the most common forest situations of each country and representing rare or endemic situations. The plot represents an Holm oak (Quercus ilex) forest located in the West of the Iberian peninsula. It is a 41-80 years old monospecific regular forest. It is a “dehesa” forest canopy (5 less than fcc less than 20%). Understory formed by Cistus sp and a rich herbal layer. Climatic gradient is Mesomediterranean. Soil is made up of sandstone.