tailieunhanh - Báo cáo lâm nghiệp: "Costs of basic methods of forest landmaintenance in protective zones of high-voltage power lines in the Czech Republic"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Costs of basic methods of forest landmaintenance in protective zones of high-voltage power lines in the Czech Republic. | JOURNAL OF FOREST SCIENCE 56 2010 1 35-40 Costs of basic methods of forest landmaintenance in protective zones of high-voltage power lines in the Czech Republic L. SlSAK Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague Czech Republic ABSTRACT The paper describes the basic potential methods and their costs of maintenance of forest lands in protective zones under high-voltage power lines HVPL 400 kV and 220 kV. In the present situation and with available information and data it was possible to accomplish the average cost calculations for the whole area of the Czech Republic. The paper analyses the following mechanical and chemical methods of maintenance of forest lands full-area scrub clearing with power saw PS selective individual scattered clearing of trees with PS full-area scrub clearing by milling full-area scrub clearing by the application of herbicides and arboricides selective individual scrub clearing of individual trees by cutting followed by spray treatment with arboricides. The maintenance of forest lands in zones of HVPL scrub clearing by milling belongs to the economically most convenient mechanical methods for example when removing 3 000 the cost of this option is 20 000-23 000 ha in a period of 3-year periodic frequency while the most expensive method is selective individual scrub clearing of scattered individual plants with PS at costs of around 84 000 . Keywords Czech Republic forest lands high-voltage power lines maintenance costs The forest land use in protective zones of high-voltage power lines HVPL 400 kV in the protective zone 70-80 m in width and 220 kV in the protective zone 50-60 m in width is very limited or even impossible from the aspect of production. According to Energy Act No. 458 2000 in zones of HVPL any kind of vegetation that exceeds the height of 3 m must be cleared. These forest lands in zones of HVPL also require quite intensive and demanding maintenance. There .