Four Case Study Regions (CSRs) representing four biogeographical regions of Europe were chosen to take regional differences in climate and forest conditions, forest growth and wood supply into account. In addition, five study sites were chosen based on availability of robust data, existing study sites or infrastructure that is required for ONEforest.

These four CSRs are:
• Mediterranean forests, CSR of Spain + study sites in Italy and Karst in Slovenia
• Alpine forests, CSR of Switzerland + study sites in the Alpine part of Slovenia
• Continental forests, CSR of Germany
• Boreal/ Hemi-boreal forests, CSR of Estonia + study site in Estonia + supportive data from Sweden

Through them the project will study climate-resilient silvicultural management practices and new methods of seeding and planting by the application of an own engineered topsoil cover based on wood fibres.