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A. P. B. K-rpan, T. PorSinsky. I. Slankić: DJELOTVORNOST STROJNK SJEČE 1 IZRADE U SASTOJINAMA ... Šumarski list br. 9-10, CXXVIII (2004). 495-508
Meek , P., 2000: Effect of the commercial thinning pre- Sionneau , J., E. Cuchet , 2001: Mechanisation of
scription on the performance of single-grip har- Thinnings in Hardwood, The Franch Expevestcrs.
For. Eng. Res. Inst. Can. (FERIC), Poin- rience. Proceedings of International conference
te-Claire, Que. Advantage Vol.1 No. 42, 1-2. "Thinnings: A valuable forest management


Peltola,A.,K. Papunen, 2001: The mechanisation tool", September 9-14, 2001, IUFRO Unit
of thinning in the Nordic countries. Proceedings 3.09.00 & FERIC & Natural Resources Canada
of International conference "Thinnings: A valu-& Canadian Forest Service, CD.
able forest management tool", September 9-14, Slunjski, M., M. Bedeković, 2003: Debljinska
2001, IUFRO Unit 3.09.00 & FERIC & Natural struktura Plana sječa HŠ d.o.o za 2003 godinu
Resources Canada & Canadian Forest Service, vezana uz mogućnost primjene harvestera. PPCD.
prezentacija prikazana na okruglome stolu "Har-


P u 1 k k i, R., 2001: Cut-to-length, tree-length or full veste r u Hrvatskoj", Ivanska, 12. veljače 2003.
tree harvesting, http://flash.lakeheadu.ca/ ~repulkki/
ctl ft.html


SUMMARY: This paper shows the results of research of mechanical felling
and processing by Timherjack 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 rnfha 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/m 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, Timherjack 1270B, thinning, hard-
wood-broadleaf species, efficiency