DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 3-4/2006 str. 18     <-- 18 -->        PDF

S. Petreš: OŠTEĆIVANJE PONIKA I POMLATKA PRI PRIVITLAVANJU I PRIVLAČENJU OBLOVINE ... Šumarski list br. 3–4, CXXX (2006), 87-100
oak plants were partially or completely damaged, which is equal to 6.75 %
of the total number of plants. The majority of damages, based on the number
of damaged plants as well as the severity of their damages, were inflicted during
the winching of roundwood and skidding of load along the skid trail.
Analysis based on the cause and type of damage has shown that during the
winching of roundwood, majority of plants was damaged by the front end of
the log (82.49 %). All the plants that grew on the skid trail (3.5 % of total
number of plants counted before the logging started) were destroyed by numerous
passes of the skidder.


It was also determined that the lengths and diameters of the roundwood
which caused damages were significantly larger than the average values for
logs that didn’t cause any damage to young pedunculate oak plants. Number
of damaged plants grows with the increase in diameters of the winched logs,
and with their winching distance.


Based on the obtained results, and with the purpose of reducing the damaging
of young plants during the skidding of roundwood from final fellings in
pedunculate oak forests by using the cable skidders to the least possible amount,
the following is recommended: limitation of skidders’ movement to skid
trails 100 meters apart from each other, directed felling of trees towards the
skid trail and stem lenght harvesting method (half-stem lenght harvesting
method in cases of borderline loads).


Key words: pedunculate oak, final cut, skidder, damages on the young
plants