Możliwości wykorzystania wskaźników intensywności trzebieży w kategoryzacji warunków pracy dla wybranych technologii pozyskiwania drewna na ręczno-maszynowym poziomie zmechanizowania
AbstractThe work of a power chain saw operator in three timber harvesting technologies was analyzed during this study. Felling and debranching were observed during the following technologies: with horse skidding, using the Multi FKS winch, and using the NIAB 5-15 processor aggre¬gated with a farm tractor. Works were carried out during early and late thinning in Scots pine, silver fir, Norway spruce, and common beech stands (Tab. 1). The purpose of this study was to determine models of labor consumption characteristics during the operational time (Tab. 2, Fig. 1). The mean level of labor consumption at the analyzed work station was 22.66 min/m3. The lowest level was observed for the NIAB technology - 11.47 min/m3, while the highest one for the FKS technology - 36.07 min/m3 (Tab. 3). The labor consumption level for the technology with horse skidding was 17.67 min/m3, i.e. about 40% higher than that for NIAB. In all investigated technologies the labor consumption level during early thinning was significantly different from that during late thinning. A lack of significant differences in the labor consumption level between some stands permitted to distinguish stand groups during approximation of regression equations. This concerned Scots pine and common beech stands, and silver fir and Norway spruce stands during late thinning in the technology with horse skidding, and during early and late thinning in the technology with the winch. Six equations of a multiple regression were approximated (Tab. 4). The factors affecting the labor consumption level were as follows: characteristics of the harvested timber (dbh and height of trees, timber volume), character of the tending treatment (thinning intensity), and elements of the workday structure (duration of individual categories of the operational work time). The proper structure of the working shift, optimal from the point of view of organization and time utilization, was determined. The utilization of the operational work time varied from 0.8 to 0.75. Because of the stabilization of variables associated with work times the variation of the labor consumption level was connected with factors reflecting characteristics of the tended stands, e.g. with the coefficient of quantitative intensity of harvesting indicating the percent of trees harvested in a stand. The variation of the described factor, determined on the basis of tabular data, was used to determine the labor consumption intervals (degrees of difficulty) of timber harvesting (Tab. 5, Fig. 2).
|Other language title versions||Possibilities of using thinning intensity indexes in classification of work conditions for selected timber harvesting technologies at the manual-machine mechanization level|
|Journal series||Acta Agraria et Silvestria series Silvestris, ISSN 0065-0927, (B 1 pkt)|
|Publication size in sheets||0.9|
|Keywords in Polish||technologia, strefy utrudnień, wydajność pracy|
|Keywords in English||technology, difficulty zones, work efficiency|
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