The Legislative Assembly finds that:
(1) Multiple taxation through a yearly ad valorem levy on both trees and forestland managed in sustained yield timber operations discourages conservation, private ownership and investment of capital.
(2) The interests of this state, its residents and its future residents are best served by sustained yield practices and taxing policies that encourage production of forest resources for commerce, recreation and watersheds, stabilize employment levels, prevent large population shifts and encourage millage of timber products within Oregon.
(3) Timber on private lands managed on a sustained yield basis should be treated as a crop and not taxed as real property.
(4) Forestland should be taxed based on the value of the forestland in timber production.