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A. P. B. Krpan, T. PorSinsky: DJELOTVORNOST STROJNE SJEČE I IZRADE U SASTO.I1NAMA ... Šumarski list br. 3-4, CXXVIII (2004), 127-136 Krpan, A. P. B., T. Porsinsky, 2001: Harvester Timberjack 1070 u Hrvatskoj. (Harvester Timberjack 1070 in Croatia). Šumarski list 125 (11-12): 619-624. Krpan, A. P. B., T. Porsinsky, 2002A: Proizvodnost harvestera Timberjack 1070 pri proredi kulture običnoga bora (Productivity of Timberjack 1070 Harvester in Scotch Pine Thinning). Šumarski list 126 (11-12): 551-561. Krpan, A. P. B., T Porsinsky, 2002B: Djelotvornost strojne sječe i izradbe u sastojinama mekih i tvrdih listača. Znanstvena studija, Šumarski fakultet Sveučilišta u Zagrebu, 1—40. Meek , P., 1993: An evaluation of four methods for procesessing timber at the stump. For. Eng. Res. Inst. Can. (FERIC), Pointe-Claire, Que. Tech. Note TN-208. 1-8. Meek , P., 2000: Effect of the commercial thinning prescription on the performance of single-grip harvesters. For. Eng. Res. Inst. Can. (FERIC), Pointe-Claire, Que. Advantage Vol. 1 No. 42, 1-2. Moskalik, T, P. Paschalis, 1999: Probleme der machinellen Holzernte in Polen. Sammelbuch 33. Internationales Symposium "Mechanisierung der Waldarbeit", Zalesina - Delnice - Senj, Forstliche Fakultat Zagreb, Kroatien, 1 .- 6. Juli 1999, 173-179. Pausch , R., 1999: Versuchsergebnisse zu Produktivitaet und Pfleglichkeit hochmechanisierter Starkholzernte. 33. Internationales Symposium "Mechanisierung der Waldarbeit", Zalesina - Delnice - Senj, Forstliche Fakultat Zagreb, Kroatien, 1.-6. Juli 1999, Vortrag, 1-18. Peltola,A.,K. Papunen, 2001: The mechanisation of thinning in the Nordic countries. 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. Porsinsky, T, 2002: Čimbenici proizvodnosti forvardera Timberjack 1210 pri iz voženju obloga drva glavnoga prihoda hrvatskih nizinskih šuma (Productivity factors of Timberjack 1210 at forwarding the main felling roundwood in Croatian lowland forests) Glasnik za šumske pokuse 39: 103-132. Pulkki, R., 2001: Cut-to-length, tree-length or full tree harvesting, http://flash.lakeheadu.ca/ —repulkki/ctlft.html Richardson, R., I. Makkonen, 1994: The performance of cut-to-length systems in eastern Canada. For. Eng. Res. Inst. Can. (FERIC), Pointe- Claire, Que. Tech. Rep. TR-109. 1-16. Sambo , S. M., 1999: Reduction of trail density in a partial cut with a cut-to-length system. For. Eng. Res. Inst. Can. (FERIC), Pointe-Claire, Que. Tech. Note TN-293. 1-12. Slunjski, M., M. Bedeković, 2003: Debljinska struktura Plana sječa HŠ d.o.o za 2003 godinu vezana uz mogućnost primjene harvestera. PPprezentacija prikazana na okruglome stolu "Harvester u Hrvatskoj", Ivanska, 12. veljače 2003. St amp fer, K, 1999: Influence of terrain conditions and thinnings regimes on productivity of a track- based steep slope harvester. In Proceedings of the International Mountain Logging and Tenth Pacific Nortwest Symposium. March 28 -April 1, 1999, Cornvallis, Oregon, 78-87. Tufts , R. A., 1997: Productivity and cost of the Pons- se 15-series, cut-to-lenght harvesting system in southern pine plantations. Forest Products Journal 47 (10): 39-46. 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. SUMMARY: Results of survey on mechanical felling and processing with harvester Timberjack 1270B, carried out among forestry experts, who visited felling sites, where work was deducted with harvester during September 2002, were considered in the paper. Survey was made by usage ofH-diagram. Main answers on issue why the machine work was not evaluated with the highest grade (10) were: doubt in usefulness in natural forests, doubt in applicability in all terrain conditions and objection on the high purchasing price of the machine. Organizational issues of applicability of the machine felling got lower rank, and the lowest frequencies were related to the issues connected with environmental unfriendliness, increased strip roads density and damages in felling site. When asked why they did not give the lowest grade (0) surveyed pointed out the productivity of the mechanical felling, ergonomic advantages, attractiveness of the work and increased safety of the work. Surveyed experts evaluated mechanical felling and processing with grades from 1 to 8, while the average value was 5.3. Results of the survey pointed out that opinions were divided, but also that forestry experts evaluated usefulness of the machine felling and processing in Croatian forests as generally positive. Key words: machine felling and processing, harvester, usefulness evaluation |