As part of the knowledge base developed within the EU project LAMASUS (deliverable D5.1) to quantify the climate impacts of land use management (LUM) changes, we present an ensemble of response functions that describe the effects of forest management de-intensification on forest biomass carbon stocks. These functions are supported by spatially explicit maps of model coefficients at a 0.5° (~50 km) resolution covering the European Union (EU27+UK, excluding overseas territories).