At the same time, the diversity, balance and regeneration capacity of forest ecosystems must be preserved. Owing to the long term of the Strategy, the desired trends of changes were set as indicators rather than particular target levels. Data for 2005 was set out as the base level. In a broader meaning, coherent landscapes constitute networks (complexes of landscapes) whose composition includes ecologically functioning units of various structures, which ensure the existence of valuable habitats and the preservation of social and economic values.