Hence, forest reserves and other non-harvested forest areas have particular values for biodiversity linked to old forests and forests under natural dynamics. Only large forest conservation areas, in the order of 100 km2 or more, will be able to accommodate such disturbance processes at realistic scales. In addition, retention of old trees, dead wood, deciduous trees, and buffer zones against mires and wetlands are important measures to maintain habitat qualities that benefit substantial parts of biodiversity in harvested forest landscapes.