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  • Author: Urszula Błuszkowska x
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Urszula Błuszkowska and Tomasz Nurek

Abstract

High work consumption in forest operations is above all the result of the character and task realization mode in works undertaken in forestry. Development of mechanization in forest management activities allows to considerably decrease manpower needs. In the present study, there were analyzed the possibilities of reduction of work consumption by improving the mechanization level of forest works. The method was developed to consider the following assessments: 1) variant W1 - basic option comprising factual work consumption values in works carried out on the area administered by the Regional Directorate of State Forests (RDLP); 2) W2 - showing the effect of 25% upgrade of works to a higher level of mechanization; 3) W3 - showing the effect of 50% upgrade of works to a higher level of mechanization; 4) W4 - comprising analogous calculations to those in variant W1 , but work consumption upgrading was 75%. Simulation calculations revealed considerable differences in needs for labor of different categories of forest workers. On the other hand, with increasing mechanization level, there increase the demands concerning worker qualifications, e.g. a harvester operator must be trained for about 2 years, and the training has to include both simulator exercises (first using software and next - harvester simulator) and field work under supervision to gain sufficient experience. The introduction of higher levels of mechanization into forest operations, and hence considerable reduction of jobs for unqualified workers who are replaced by qualified employees, can help decreasing work consumption in forest operations.

Open access

Monika Aniszewska and Urszula Błuszkowska

Abstract

This study aimed at determining the shape of closed silver fir cones from the Jawor Forest District (Wroclaw), based purely on measurements of their length and thickness. Using these two parameters, the most accurate estimations were achieved with a fourth-degree polynomial fitting function. We then calculated the cones’ surface area and volume in three different ways: 1) Using the fourth-degree polynomial shape estimation, 2) Introducing indicators of compliance (k1, k2, k3) to calculate the volume and then comparing it to its actual value as measured in a pitcher filled with water, 3) Comparing the surface area of the cones as calculated with the polynomial function to the value obtained from ratios of indicators of compliance (ratios k4 and k5). We found that the calculated surface area and volume were substantially higher than the corresponding measured values. Test values of cone volume and surface area as calculated by our model were 8% and 5% lower, respectively, compared to direct measurements. We also determined the fir cones apparent density to be 0.8 g·cm-3on average. The gathered data on cone surface area, volume and bulk density is a valuable tool for optimizing the thermal peeling process in mill cabinets to acquire high quality seeds.

Open access

Urszula Błuszkowska and Tomasz Nurek

Abstract

The aim of the work was to analyse the provisions included in the Specifications of the Essential Terms of Contract in tenders for forestry works. The subject of the analysis was tender documentation of a selected Regional Directorate of State Forests. An attention was given to a number of inconsistencies, and non-specific and unjustified requirements. The presence of significant differences in the manner of defining requirements in the examined forest districts was emphasised. In opinion of the authors, the differences observed are unjustified and without any doubt impede the creation of tender documentation by representatives of forestry work companies. The summary of the analysis consists of, among others, a few guidelines on the manner of defining the requirements for forestry work companies and the need to unify the SIWZ provisions at the level of Regional Directorate of State Forests.