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| Krpan, A. P. B., Poršinsky, T., Stankić, I. | UDK 630* 363 (001) |
| Efficiency of Mechanical Felling and Processing in Soft and Hardwood broadleaved stands – Part 3: Efficiency of harvester in natural thinning stands of hardwood broadleaf species
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495 |
Summary: This paper shows the results of research of mechanical felling and processing by Timberjack 1270B harvester in 80-year old natural thinning stands of Sessile Oak, European Beech and European Hornbeam.The researched cut-blocks have more or less equal stand features: growing stock – 310 m3/ha, basal area – 24.3 m2/ha with 430 trees per ha, harvesting density – 30 m3/ha with 47 trees per ha. No secondary openness was provided for the stands through parallel skid trails typical of harvester operations, and tree marking was not carried out to that end. Therefore, the harvester moved across the felling site to reach the marked trees and in doing so it also cut some unmarked (thinner) trees.The trees, whose stump-height diameter exceeded the possibility of being cut by the felling (harvester) head, were cut by an auxiliary operator – cutter. Similarly, the trees with large crowns were also processed by the cutter with chainsaw. In the structure of effective time, mechanical harvester operations prevail with a share of 81.3 %, and the share of motor-manual operations with chain saw accounts for 18.7 %.The analysis of mechanical harvester operations has shown that felling and processing account for 44.2 %, boom out for 7.9 %, undergrowth cleaning for 4.8 %, and harvester moving at the felling site for 24.4 % of effective time.The average productivity of felling and processing achieved by joint operations of harvester and chain saw was 14.5 m3/h or 24 tree/h with total time consumption of 4.13 min/m3 or 2.45 min/tree. The harvester’s effective time consumption was 3.78 min/m3 or 2.24 min/tree.Based on the results of the research of mechanical felling in the stands of softwood and hardwood broadleaf species and the market price of felling and processing wood by chain saw, harvester’s operational field is recommended in deciduous stands.
Key words: mechanical felling; Timberjack 1270B; thinning; hardwood-broadleaf species; efficiency |
| Kajba, D., Bogdan, S., Katičić-Trupčević, I. | UDK 630* 165 + 238 001. (Salix alba) |
| White Willow Biomass Production in a Short Rotation Clonal Test Dravica
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509 |
| Kremer, D. | UDK 630* 174 + 532 (001) |
| Morphometric Research of Leaves Characteristic of “American Ash” Acclimatized in Lowland Forests in Croatia
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517 |
| Posavec, S., Žgela, T. | UDK 630* 232.3 + 765 (001) |
| Calculating the Prime Cost of Forest Seedlings of Pedunculate Oak (Quercus robur, L.)
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529 |
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| PRETHODNO PRIOPĆENJE |
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| Šušnjar, M., Lukić, N. | UDK 630* 524 |
| Double-Entry Tables of Volume of Fir Trees from Forest Management Unit “Belevina”, Gorski Kotar
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537 |
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| Pentek, T., Pičman, D., Nevečerel, H. | UDK 630* 684 |
| The Mean Wood Skidding Distance
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545 |
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| Frković, A. | UDK 630* 156 |
| Forester Jaroslav Šugh, Esq. and his “Posavski Lovac” (“The Hunter Of Posavina”)
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559 |
