Template-Type: ReDIF-Article 1.0 Author-Name: R. Podlaski Author-Workplace-Name: Świętokrzyski National Park, Scientific and Research Laboratory, Bodzentyn, Poland Title: Radial growth trends of fir (Abies alba Mill.), beech (Fagus sylvatica L.) and pine (Pinus sylvestris L.) in the Świętokrzyski National Park (Poland) Abstract: The objectives of this study are to determine a trend of the radial growth at breast height (b.h.) and to compare the radial growth of trees of younger and older generations in the XX century for fir (Abies alba Mill.), beech (Fagus sylvatica L.) and pine (Pinus sylvestris L.) in the Świętokrzyski National Park. In the investigated area fir, 41 to 200-300 years of age at breast height, gradually regenerated its radial growth after a very strong decline during 1971-1990, and most likely the process of vitality reduction and death of its stands of various age is slowly coming to an end. Pine showed a systematic decrease in the radial increment during 1885-1994, and there were no distinct symptoms indicating a change of this unfavourable trend. Beech showed no significant decrease in the radial increment during 1885-1994. In the Świętokrzyski National Park the differences in the radial growth between younger and older generations were noticeable only in the case of beech. The radial growth of trees of different ages was very similar in the case of fir and pine. Keywords: Abies alba, Fagus sylvatica, Pinus sylvestris, radial increment, increment decline, increment regeneration, Święto-krzyski National Park Journal: Journal of Forest Science Pages: 377-387 Volume: 48 Issue: 9 Year: 2002 DOI: 10.17221/11897-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11897-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200209-0001.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:9:id:11897-JFS Template-Type: ReDIF-Article 1.0 Author-Name: D. Král Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Assessing the growth of Picea omorika [Pan.] Purkyn in the Masaryk Forest Training Forest Enterprise at Ktiny Abstract: Plantations of Serbian spruce (Picea omorika [Panč.] Purkyně) reach an age over 70 years at the Masaryk Forest Training Forest Enterprise (TFE) at Křtiny. They occur at different sites of the TFE, which is situated north of Brno between Blansko, Jedovnice and Brno in the Czech Republic. The paper presents an assessment of primary mensurational values (diameter at breast height d.b.h., height h, Derbholz volume m3), fertility, mortality and general health condition. The present registered number of Serbian spruce trees is 425 (from originally 750 individuals) in 25 localities and 12 GFT (groups of forest types). A comparison of Serbian spruce mensurational data with growth tables indicated that Serbian spruce on GFT 4K makes up for the tabular mean values of Norway spruce (Picea abies [L.] Karst.) in yield class +1. Keywords: growth assessment, localities, introduced tree species, Serbian spruce, group of forest types Journal: Journal of Forest Science Pages: 388-398 Volume: 48 Issue: 9 Year: 2002 DOI: 10.17221/11898-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11898-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200209-0002.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:9:id:11898-JFS Template-Type: ReDIF-Article 1.0 Author-Name: J. Tuček Author-Workplace-Name: Technical University, Faculty of Forestry, Zvolen, Slovak Republic Author-Name: J. Ligoš Author-Workplace-Name: Technical University, Faculty of Forestry, Zvolen, Slovak Republic Title: Forest canopy influence on the precision of location with GPS receivers Abstract: This article presents the results of a test of three GPS receivers of GIS category (Topcon Turbo G1, Topcon, Magellan ProMark X-CM, Magellan, March II-E, Corvalis Microtechnology) in location under the entire cover of forest canopy. A network of 111 experimental points was established in the territory of Training Forest Enterprise (TFE) of the Technical University Zvolen, Forest District Kováčová, in variable forest and terrain conditions. Location of the points was measured by an exact terrestrial geodetic method and consequently by all receivers. To evaluate the location precision of each receiver we used the method of calculation of individual differences in co-ordinate values for each measurement, and calculation of average differences and their standard devia- tions for groups of measurements. The values of average co-ordinate errors and testing of the presence of systematic error were also calculated. To evaluate the influence of receiver type, stand age, tree species composition and terrain configuration multi-factor analysis of variance was used. General location error was 7.16 m for Topcon, 5.89 m for Magellan and 5.60 m for March. Difference between Topcon and the other two receivers is statistically significant. The influence of forest stand age is also statistically significant. The results of the test of tree species composition and terrain configuration influence are not unambiguous. Keywords: GPS, location precision, forest canopy influence, Topcon, Magellan, March Journal: Journal of Forest Science Pages: 399-407 Volume: 48 Issue: 9 Year: 2002 DOI: 10.17221/11900-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11900-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200209-0003.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:9:id:11900-JFS Template-Type: ReDIF-Article 1.0 Author-Name: S. Navrátil Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Author-Name: A. Skoupý Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Title: A contribution to the detection of sliding resistance and calculation of critical slope inclination at timber dragging by horse Abstract: The paper deals with the determination of sliding resistance at dragging timber by horse and with the calculation of critical slope inclination in situations of threatening spontaneous movement of timber. These are reasons why the horse should not be used in such conditions. Different conditions of skidding trail surface are considered in winter and summer periods of the year. Sliding resistance was determined by using an original methodology in which the acting forces are measured by strain gauges directly at the timber dragging by horse. It was found out that the coefficient of sliding resistance cannot be determined as one concrete figure but rather as an interval of values since it is considerably variable with the character of terrain and character of the surface of dragged log. This is why the critical slope inclination should be determined in a certain interval, too, in order to include the measure of acceptable risk. The measure of acceptable risk is defined by using an auxiliary coefficient of safety whose value should range in the interval from 0.5 to 1.0 as a value indirectly proportional to the magnitude of sliding resistance coefficient. Keywords: forest technology, timber dragging, horse, sliding resistance, critical slope inclination Journal: Journal of Forest Science Pages: 408-414 Volume: 48 Issue: 9 Year: 2002 DOI: 10.17221/11901-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11901-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200209-0004.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:9:id:11901-JFS Template-Type: ReDIF-Article 1.0 Author-Name: M. Saniga Author-Workplace-Name: Institute of Forest Ecology, Slovak Academy of Sciences, Research Station Staré Hory, Slovak Republic Title: Habitat features of the capercaillie (Tetrao urogallus) leks in the West Carpathians Abstract: Habitat characteristics of 43 capercaillie (Tetrao urogallus) leks were studied in the mountains of Central Slovakia (West Carpathians) in 1984-2002. Macro-habitat was described with respect to topography and succession stage. Micro-habitat was described with respect to forest type and forest stand structure. Twenty-seven out of forty-three display grounds were situated in the upper half of the lateral ridges. Sixteen leks were located on hills of the lateral ridges (slope < 10%). All the leks were situated in old succession stages of the forest (80-200 years old). Twenty-seven display grounds were located in natural forests, sixteen leks were situated in man-managed stands more than 80 years old. Leks were situated in a variety of forest types with overstorey tree-density between 400-1,050 stems per ha. Distribution of leks was limited above all by macro-habitat characteristics (elevated sites, old stands). Age-space structure seemed to be a significant micro-habitat feature (preference of multi-layered stands). Keywords: capercaillie, Tetrao urogallus, lek, habitat, West Carpathians Journal: Journal of Forest Science Pages: 415-424 Volume: 48 Issue: 9 Year: 2002 DOI: 10.17221/11903-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11903-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200209-0005.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:9:id:11903-JFS