Influence of technological processes on labour productivity and costs of wood harvesting in pine stands of elderly class of age. Part 2. Clear cuts
Investigations were performed in two Scots pine stands differed in average tree volume (0,4 m3 and 0,7 m3). In both cases four technological processes of wood harvesting were tested: two of whole-stem method and two of short-wood method. Chain saw or one arm harvester was used for felling and other technological operations while skidder or forwarder (whole-stem methods) and only forwarder (short-wood methods) for wood harvesting. The highest productivity (96,0-63,5 and 109,0-72,8 m3/8 machine hours for the average tree volume 0,4 m3 and 0,7 m3 accordingly and 100-1000 m of extraction distance) was obtained for short-wood method that applied harvester and forwarder. This method was also characterized by the lowest unit cost of wood harvesting: 18,7-26,3 zł/m3 for 0,4 m3 trees and 16,0-22,4 zł/m3 for 0,7 m3 trees with the extraction distance ranged from 100 m to 1 km (with the use of machinery equal to 1600 hours/year).
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