Journal of Forest Science, 2004 (vol. 50), issue 5
Modifying the elastomechanics of the stem and the crown needle mass distribution to affect the diameter increment distribution: A field experiment on 20-year old Abies grandis trees
D. Gaffrey, B. Sloboda
J. For. Sci., 2004, 50(5):199-210 | DOI: 10.17221/4616-JFS 
In the spring of 2000, field experiments were begun on three 20-year old grand fir (Abies grandis) to influence the elasto-mechanical behavior of the stem, as well as the distribution of the assimilate crown production. The aim was to analyze, and then describe and model the expected resulting change in stem growth. Three stem sections of one fir were reinforced by rigidly attaching T-shaped steel bars to reduce bending stresses. Preliminary calculations with an elasto-mechanical tree and force model (that had been developed for a different tree, but was adapted by taking the size differences into account) gave first indications for the experimental...
A contribution to the knowledge of Scots pine (Pinus sylvestris L.) stem shape
M. Křepela, J. Sequens, D. Zahradník
J. For. Sci., 2004, 50(5):211-218 | DOI: 10.17221/4617-JFS
This is a study on the evaluation of stem shape in Scots pine. The experiments were carried out on 430 stems without bark, taken from 30 fully analysed sample trees that grew in 5 different locations in the Czech Republic. Generalized Procrustes analysis was used as the method of study. The stems were described by the use of landmarks. Full Procrustes coordinates were calculated for all stems, and the full Procrustes mean shape was set for individual sample trees, locations and all stems. For Procrustes tangent coordinates, variability was examined using the method of principal components. The two most important principal components were diagrammatized...
Influence of forest stand structure on the occurrence of bird community in Skalná Alpa National Nature Reserve in the Veľká Fatra Mts. (West Carpathians)
M. Saniga, M. Saniga
J. For. Sci., 2004, 50(5):219-234 | DOI: 10.17221/4618-JFS
The study deals with the influence of the structure, texture and dynamics of a spruce-beech primeval forest on the bird community in Skalná Alpa National Nature Reserve in the Veľká Fatra Mts. (West Carpathians, Slovakia) in the years 1982-2002. The abundance of Norway spruce (Picea excelsa Lam.) was highest both in the optimum and decomposition stage. In the growth stage the number of Norway spruce (Picea excelsa Lam.) trees was quite low. The texture of spruce-beech virgin forest was very variable. Percentage ratios of individual stages on the area of 42.16 ha were as follows: growth stage 38.3%, optimum stage 20.1% and decomposition...
Picea pungens Engelm. - a new host of Dothistroma needle blight Mycosphaerella pini E. Rostrup detected in the Czech Republic
L. Jankovský, D. Palovčíková, M. Bednářová
J. For. Sci., 2004, 50(5):235-236 | DOI: 10.17221/4619-JFS
Dothistroma needle blight Mycosphaerella pini is an important pathogen of pine needles. In addition to different species of pine, M. pini was found in blue spruce Picea pungens in the proximity of infected Pinus nigra in the region of southern Moravia about 20 km SE of Brno.
Changes in cold hardiness of silver fir and larch bare-rooted seedlings during autumn and spring
M. Sarvaš
J. For. Sci., 2004, 50(5):237-242 | DOI: 10.17221/4620-JFS
The objective of this study was to obtain information about changes in cold hardiness of larch and silver fir seedlings during autumn and spring by help of measurements of electrolyte leakage from shoots (SEL) and root system (REL). The values of electrolyte leakage from the untreated (control) root system of silver fir decreased during autumn (from 28% on September 25 to 24% on November 27). Minimum values were reached on March 26. A decrease in electrolyte leakage was found for silver fir shoots (SEL) (the maximum was detected on October 2 - 12% and minimum on November 27 - 7%). Contrary to REL, SEL increased in March. The rate of electrolyte leakage...
Design of forest road network in relation to all-society functions of forests
M. Kašková
J. For. Sci., 2004, 50(5):243-247 | DOI: 10.17221/4621-JFS
The basic condition of forest management development is the accessibility of the forest. A design of the forest road network in relation to all-society functions of forests has been made in the catchment of the Vilčok stream. The catchment is situated in Protected Landscape Area Beskydy. The method Quantification and quantitative evaluation of functions of forests as a basis for their evaluation (Vyskot et al. 2003) was used for the design. This method can be applied to road planning. It can serve as another component in the decision-making process of the planning of forest road construction.