3D-CMCC-FEM – Three Dimension Forest Ecosystem Model (Collalti et al., 2014; Collalti et al., 2016; Marconi et al., 2017; Collalti et al., 2018) is a dynamic process-based model which simulates forest growth, carbon allocation and other dynamics in heterogeneous populations (mixed and un-evenaged). The model is based on the reproduction, at daily time scale and according to climate, soil and stand characteristics, of the main eco-physiological processes governing gross and net primary production (GPP, NPP), carbon and water dynamics.