Change of land cover with depletion of tree crown cover to less than 10 percent. Changes within the forest class (e.g., from closed to open forest) which negatively affect the stand or site, and in particular, lower the production capacity, are termed forest degradation. [fn]Source:(EFI 2002) from European Forest Institute, Internal Report No. 6, 2002 "Compliation of Forestry Terms and Definitions" by Schuck, Paivinen, Hytonen, and Pajari.[/fn]