Journal of Forest Science, 2002 (vol. 48), issue 9

Radial growth trends of fir (Abies alba Mill.), beech (Fagus sylvatica L.) and pine (Pinus sylvestris L.) in the Świętokrzyski National Park (Poland)Original Paper

R. Podlaski

J. For. Sci., 2002, 48(9):377-387 | DOI: 10.17221/11897-JFS  

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...

Assessing the growth of Picea omorika [Pan.] Purkyn in the Masaryk Forest Training Forest Enterprise at KtinyOriginal Paper

D. Král

J. For. Sci., 2002, 48(9):388-398 | DOI: 10.17221/11898-JFS  

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...

Forest canopy influence on the precision of location with GPS receiversOriginal Paper

J. Tuček, J. Ligoš

J. For. Sci., 2002, 48(9):399-407 | DOI: 10.17221/11900-JFS  

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...

A contribution to the detection of sliding resistance and calculation of critical slope inclination at timber dragging by horseOriginal Paper

S. Navrátil, A. Skoupý

J. For. Sci., 2002, 48(9):408-414 | DOI: 10.17221/11901-JFS  

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...

Habitat features of the capercaillie (Tetrao urogallus) leks in the West CarpathiansOriginal Paper

M. Saniga

J. For. Sci., 2002, 48(9):415-424 | DOI: 10.17221/11903-JFS  

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...