Journal of Forest Science, 2005 (vol. 51), issue 2
Semivariogram analysis of Landsat 5 TM textural data for loblolly pine forests
J. Zawadzki, Ch.J. Cieszewski, M. Zasada
J. For. Sci., 2005, 51(2):47-59 | DOI: 10.17221/4543-JFS 
The objective of this study was to evaluate the applicability of Landsat 5 TM images for analysing the textural information on pine forest stands in western Georgia, United States. Analysing spatial correlations between pixels measured by semivariances and cross-semivariances (cross-correlation between two radiometric bands) calculated from transects of Landsat TM images, we explored differences between semivariances associated with images of stands of various ages, origins (natural vs. planted) and species (loblolly pine - Pinus taeda L. - versus longleaf pine - Pinus palustris Mill.). We analysed both ground measurements and the satellite images...
Effect of forest tree species on the humus form state at lower altitudes
V. V. Podrázský, J. Remeš
J. For. Sci., 2005, 51(2):60-66 | DOI: 10.17221/4544-JFS
The paper documents the effects of forest stands of different species composition on the humus form state and soil profile chemistry. It compares the situation in mixed broadleaved (ash, oak, hornbeam), basswood and spruce stands. Spruce demonstrates the site degradation effects: raw humus accumulation, soil acidification, negative effects on nutrient dynamics. Both broadleaved stands were similar as for site effects, lower litter accumulation, more rapid organic matter mineralization and more rapid nutrient cycling and intense uptake were documented in the basswood stand.
Structure, quality, production, LAI and dendrochronology of 100 years old Austrian pine (Pinus nigra ARNOLD) stand
F. Tokár, E. Krekulová
J. For. Sci., 2005, 51(2):67-76 | DOI: 10.17221/4545-JFS
The paper evaluates the growth, structure, production, quality, leaf area index and dendrochronology of 100 years old Austrian pine (Pinus nigra ARNOLD) monoculture situated in the forest type group Fageto-Quercetum in the locality Horné Lefantovce (Nitrianska Streda Forest District, Topoľčianky Forest Enterprise). Codominant trees, trees with stem of high quality, with medium-sized crown, medium dense and straight crown are the most abundant in the stand. The tree number in the stand is 1,024 trees/ha, basal area 51.75 m2/ha, growing stock 571.56 m3/ha, aboveground biomass stock 348.76 t/ha and leaf area index 21.85 ha/ha. Dendrochronological analyses...
Assessing the bending strength and modulus of elasticity in bending of exterior foiled plywoods in relation to their construction
J. Hrázský, P. Král
J. For. Sci., 2005, 51(2):76-94 | DOI: 10.17221/4546-JFS
The paper summarizes results of an institutional research aimed at assessing the bending strength and modulus of elasticity in bending of exterior foiled combined and all-beech plywoods in relation to their construction. A relationship was studied of the plywood construction and selected physical and mechanical properties. In studied sheets, moisture, density, bending strength and modulus of elasticity were analysed along and across the grain of the upper veneer. All measurements were carried out in water-resistant plywoods with surface treatment with a phenolformaldehyde foil 8, 10, 12 and 15 mm thick in combined plywoods and 10, 12, 15 and 18 mm...