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 22 Pn represents a Pinus nigra pine forest of Maestrazgo region (Iberian mountain range) . It is an 81 to 100 years old monoespecific regular forest The stand is in the regeneration section, before the final cut. Climatic gradient is Supramediterranean. Plot is located in a hillside, with gentle slope. Soil is calcareous and extremely rocky.