tailieunhanh - Báo cáo lâm nghiệp: "Forest yield index and its applicability to the assessment of future forest yields"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Forest yield index and its applicability to the assessment of future forest yields. | JOURNAL OF FOREST SCIENCE 55 2009 1 41-50 Forest yield index and its applicability to the assessment of future forest yields L. Kulla1 2 J. Tutka1 R. Maruốák2 National Forest Centre Forest Research Institute Zvolen Zvolen Slovakia Faculty of Forestry and Wood Sciences Czech University of Life Sciences in Prague Prague Czech Republic ABSTRACT The paper suggests and examines a simplified relative indicator of forest production with special regard to possibilities of its use in projecting future forests. Forest yield index IY based on an economic parameter value of final cutting yield was proposed and examined in the model territory of Kysuce in north-western Slovakia. The current values of final cutting yield dependent on tree species site index and the length of rotation period served as a basis for the assessment of expected yields. The possibilities and limitations of index applicability in long-term strategic forest management decision-making are discussed considering the uncertainty of ecological and economic conditions during the long forest production cycle as well as the complexity of tree species growth and production in the mixed forests uneven aged forests and forests under climate change. Keywords forest growth wood production final cutting yield tree species composition forest management The crucial step of each decision-making process is to determine a target. In general the target should be defined clearly it should be important achievable objectively justified and time-limited Kolenka 1991 . The target of forest management is a forest which can best fulfil the functions required by the society. It is characterized by target tree species composition target structure and target wood production which are interdependent to a large extent. Target tree species composition is the most important feature and in the practice of forest management based on even aged forests with regulated felling area a preferred attribute of the target forest. In Slovakia .