Assessing the Erosion Regulation Service Provided by European Forests

Forests reduce water-driven soil erosion, yet their protective contribution has not been assessed consistently across the European Union (EU) in a framework that separates per-area service intensity from aggregate service flow. We quantified erosion regulation service (ERS) as RUSLE-based avoided sheet and rill erosion: the difference between structural soil-loss potential (C = P = 1) and loss under forest conditions. Spatially aligned European RUSLE factors were combined with the CORINE Land Cover 2018 forest mask and summarised by country, biogeographical region and elevation. Across 134.10 Mha, ERS totalled 6806.15 Mt yr−1 (mean 50.75; median 12.36 t ha−1 yr−1), revealing strong spatial concentration. Slovenia had the highest mean intensity (257.45 t ha−1 yr−1) across 1.13 Mha of mapped forest, whereas Italy provided the largest national total (1437.05 Mt yr−1) across 7.83 Mha of mapped forest. Alpine and Mediterranean forests supplied 64.0% of total ERS in the 27 EU Member States (EU27) while occupying 27.7% of mapped forest area. Mean intensity increased from 9.70 t ha−1 yr−1 below 200 m to 248.53 t ha−1 yr−1 at ≥2000 m, but total service peaked at 500–1000 m. This intensity–area trade-off distinguishes priority locations from major national contributions and provides a spatially consistent baseline for multifunctional forest management, soil protection and ecosystem restoration. ERS represents modelled avoided hillslope erosion, not sediment yield or a deforestation scenario.