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|ŠUMARSKI LIST 7-8/2015 str. 49 <-- 49 --> PDF|
COMPARISON OF MECHANIZED AND MOTOR-MANUAL CUTTING OPERATION IN MIXED STANDS OF SOUTHERN SLOVENIA
USPOREDBA MEHANIZIRANE I RUČNO-STROJNE SJEČE U MJEŠOVITIM SASTOJINAMA JUŽNE SLOVENIJE
Janez Krč, Uroš Vranešič, Boštjan Košir
By increasing the diversity of conditions influencing the forest operation we are often faced with the dilemma of combining Motor manual and Cut to length technologies. The results of time study and productivity of cutting and skidding operation in mixed stands with a substantial proportion of deciduous trees are presented. Older pole stand was divided into four homogeneous strata in which forest operation was executed by applying two different technologies (motor manual and cut to length), each on two research areas. The objective of this study was to identify the influential factors which could be used as guidelines in the decision support system evaluating the suitability of both technologies. The results show that the mechanized cutting productivity is statistically significantly different for different tree morphological characteristics. In order to set up general guidelines it was established that the productivity in stands with single-trunked, short crown and thin branches processed with Cut-to-length technology is 25% higher than in the comparable stands consisting of multi-trunked trees, deep crowns with thick branches in terms of diameter at breast height structure.
KEY WORDS: cut-to-length, motor-manual, hardwood, time study, working techniques, productivity
Traditional long-wood systems, based on motor-manual cutting and wood extraction with tractors and cable cranes diminish (hereinafter referred to as MM) and are gradually replaced with the Cut-to-length technology (hereinafter referred to as CTL).
In most cases the CTL technology is applied by using harvester and forwarder in forest operation. Given the natural conditions and stand characteristics in Slovenia we had to face the challenge of adapting the mechanized cutting forest operation to a large diversity of terrain, stand and forest ownership which affects the competitiveness of CTL technology compared to traditionally used MM technology. Forest operation is carried out in diverse topography, intensive variety of stand conditions on a relatively small area, relatively large tree dimensions and approximately the same share of growing stock between conifers and deciduous trees. Large trees also open question of combining MM and