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T. Porsinsky, A.P.B. Krpan, 1. Stankić: DJELOTVORNOST STROJNE SJEČE I IZRADE U SASTOJINAMA Šumarski list br. 11-12, CXXVIII (2004), 655-669 "Thinnings: A valuable forest management tool", September 9-14, 2001, IUFRO Unit 3.09.00 & FERIC & Natural Resources Canada & Canadian Forest Service, CD. Siren, M., 2001: Tree Damage in Single-Grip Harvester Thinning Operations. Journal of Forest Engineering 12(1): 29-38.0 Spinelli , R., 1994: Environment impact of logging by farm tractors. Interactive seminar and workshop "Soil, tree, machines interaction", Feldafing, Germany, 1-10. Škorić , A., 1982: Priručnik za pedološka istraživanja. Fakultet poljoprivrednih znanosti Sveučilišta u Zagrebu, 1-57. Škorić , A., 1991: Sastav i svojstva tla. Fakultet poljoprivrednih znanosti Sveučilišta u Zagrebu, 1-136. Tomanić, S., V. Vondra, I. Martinić, 1989: Oštećivanje sastojina pri šumskim radovima (Damage on Stands at Forest Work). Mehanizacija šumarstva 14 (3-4): 65-72. Ward, S.M., J. Lyons, 2001: The development of an operations protocol (OP) for wood harvesting on sensitive sites. Proceedings of International conference "Thinnings: A valuable forest management tool", September 9-14, 2001, IUFRO Unit 3.09.00 & FERIC & Natural Resources Canada & Canadian Forest Service, CD. Ward, S.M., P M.O. Owende, 2003: Development of a protocol for eco-efficient wood harvesting 2nd on sensitive sites. Proceedings of theInternational Scientific Conference "Forest and Wood-Processing Technology vs. Environment - Fortechenvi Brno 2003", May 26-30, 2003, Brno, Chech Republic, Mendel University of Agriculture and Forestry Brno & IUFRO WG 3.11.00,473-482. Warkotsch, P.W., L. van Huysten, G. J. Olsen, 1994: Soil compaction damage, rooth growth, and yield losses in eucalyptus grandis plantations in Zululand, South Africa, Interacctive seminar and workshop "Soil, tree, machines interaction", Feldafing, Germany, 1-22. Wasterlund,!., 1994: Forest response to soil disturbance due to machine traffic. Interactive seminar and workshop "Soil, tree, machines interaction", Feldafing, Germany, 1-23. Wasterlund , I., 1996: Environgentle forestry operations - possible or must. Proceedings of the seminar Progresses in Forest Operations, 8 May 1996, Ljubljana, Slowenia, 9-14. Wasterlund , I., 2002: Soil disturbance in forestry: Problems and perspectives. Proceedings of the International Seminar on New Roles of Plantation Forestry Requiring Appropriate Tending and Harvesting Operations, September 29 - October 5, 2002, Tokyo, Japan, The Japan Forest Engineering Society & IUFRO WG 3.04/3.06/3.07,312-315. Wasterlund , I., 2003: Soil disturbance problems in forestry. Proceedings of the 2nd International Scientific Conference "Forest and Wood-Processing Technology vs. Environment - Fortechenvi Brno 2003", May 26-30, 2003, Brno, Chech Republic, Mendel University of Agriculture and Forestry Brno & IUFRO WG 3.11.00,491-495. SUMMARY: This paper shows the consequences of mechanical felling and processing in thinning mixed natural stand consisting of Sessile Oak fQuercus petraea Matt.), European Beech (Fagus sylvatica L.) and European Hornbeam (Carpinus betulus L.) by one-grip harvester Timberjack 1270B. Research of mechanical felling and processing consequences has pointed out tree damages and changes of some physical soil properties under compaction after single harvester pass. Research of standing tree damages by Timberjack 127 0B harvester was carried out in 80 years old stand, with the growing stock of 323 m3/ha and the basal area of 24.4 m2/ha with 449 trees per ha. Removal of thinning was 36.2 m3/ha (50 trees per ha). There were no parallel skid trails typical for the harvester operations in the cutblock neither the tree marking for this purpose was done. Therefore, the harvester moved to the marked trees across the cut- block. The research established stand damage through the analysis of structural features of sustained damages. Operations and routines which are causing damage were identified and the assessment of the harvester performance |