Article Harmonized Classification of Forest Types in the Iberian Peninsula Based on National Forest Inventories Leónia Nunes 1,2,* , Mauro Moreno 3, Iciar Alberdi 4, Juan Gabriel Álvarez-González 5 , Paulo Godinho-Ferreira 1,3, Stefano Mazzoleni 3 and Francisco Castro Rego 1 1 Centre for Applied Ecology “Professor Baeta Neves” (CEABN), InBIO, School of Agriculture, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal;
[email protected] (P.G.-F.);
[email protected] (F.C.R.) 2 CITAB, Centre of the Research and Technology of Agro-Environmental and Biological Science, University of Trás-os-Montes and Alto Douro, Qta. de Prados, 5000-801 Vila Real, Portugal 3 Department of Agricultural Sciences, University of Naples Federico II, 100-80055 Naples, Italy;
[email protected] (M.M.);
[email protected] (S.M.) 4 INIA-CIFOR, Departamento Selvicultura y Gestión de los Sistemas Forestales, Ctra. La Coruña km. 7.5, 28040 Madrid, Spain;
[email protected] 5 Departamento de Ingeniería Agroforestal, Universidad de Santiago de Compostela, 27002 Lugo, Spain;
[email protected] * Correspondence:
[email protected]; Tel.: +351-21-365-3333 Received: 10 September 2020; Accepted: 1 November 2020; Published: 2 November 2020 Abstract: National Forest Inventories (NFIs) collect and provide a large amount of information regarding the forest volume, carbon stocks, vitality, biodiversity, non-wood forest products and their changes. Forest stands variables data are paramount to understanding their composition, especially on those related with understory characteristics and the coverage of species according to canopy layers; they are essential to assess biodiversity and to support forest management.