Journal of Forest Science, 2006 (vol. 52), issue 3
Aspen micropropagation: use for phytoremediation of soils
J. Malá, P. Máchová, H. Cvrčková, L. Čížková
J. For. Sci., 2006, 52(3):101-107 | DOI: 10.17221/4491-JFS 
Toxic pollution of soils is a major environmental problem in the Czech Republic. Most contemporary remediation approaches do not provide acceptable solutions. For environmental clean-up, the use of specially selected and engineered plants capable of effective restoration and stabilization of contaminated sites is an emerging technology called phytoremediation. Aspen (Populus spp.) trees represent optimal plants for absorption, accumulation, storage, and degradation of environmental pollutants such as heavy metals, pesticide residues, and other waste products. The first aim of this study was to verify possibilities of micropropagating selected...
Regime and dynamics of soil moisture in forest ecosystems of Záhorská lowland
L. Tužinský
J. For. Sci., 2006, 52(3):108-117 | DOI: 10.17221/4492-JFS
The paper describes the regime and dynamics of the soil moisture content of sandy soils in Záhorská lowland during different growing seasons. Research plots are situated near Kamenný mlyn, approximately 3 km from Plavecký Štvrtok and 8 km southward from the town of Malacky. Changes in the soil moisture content are described by soil moisture constants (MCC, PDA, WP) and its relation to atmospheric precipitation and to the character of undergrowth is shown. The low water-holding capacity of sandy soils and their high drainage together with dense root system do not allow the sufficient saturation of soil during the growing season. The low wilting point...
Effects of the thickness of rotary-cut veneers on properties of plywood sheets. Part 2. Physical and mechanical properties of plywood materials
J. Hrázský, P. Král
J. For. Sci., 2006, 52(3):118-129 | DOI: 10.17221/4493-JFS
The second part of the paper summarizes results of an institutional research aimed at the determination of physical and mechanical properties of different sets of plywood sheets pressed under different conditions. The first part dealt with the determination of compressibility or values of decreasing the thickness of pressed plywood sheets. In this second part, results are summarized of the analysis of physical and mechanical properties of the set of whole-beech plywood sheets of the nominal thickness of veneers amounting to 1.5 mm. The plywood sheets were manufactured as seven-ply and urea-formaldehyde resin DUKOL S was used for their production. The...
Spatial distribution of losses in growth of trees caused by the feeding of pine shoot beetles Tomicus piniperda and T. minor (Col., Scolytidae) in Scots pine stands growing within range of the influence of a timber yard in southern Poland
A. Borkowski
J. For. Sci., 2006, 52(3):130-135 | DOI: 10.17221/4494-JFS
This study deals with the assessment of increment losses in Scots pine trees caused by the maturation feeding of pine shoot beetles Tomicus piniperda (L.) and T. minor (Hart.) (Col., Scolytidae) in even-aged stands growing during their entire life span within range of the influence of a sawmill and its timber yard. In spring 2004, on three sample plots, 0.2 ha in size, situated 60, 200, and 500 m from the yard, height and dbh of all trees were measured and increment cores were taken from randomly selected sample trees. An agreement between the spatial distribution of losses in tree increments and the distribution of damage to crowns...
Infection of wintering pupae of horse-chestnut leafminer Cameraria ohridella Deschka et Dimić. by Verticillium lecanii(Zimmerman)Viégas
T. Samek, D. Novotný, L. Jankovský
J. For. Sci., 2006, 52(3):136-140 | DOI: 10.17221/4495-JFS
The population dynamics of the horse-chestnut leafminer Cameraria ohridella Deschka et Dimić. was investigated in 1997-2000. The mortality of wintering pupae and the rate of fungal infections were also examined. The mortality of the horse-chestnut leafminer was nearly 40% at the end of spring. The spectrum of fungi on examined dead pupae was as follows: Verticillium lecanii (Zimmerman) Viégas, Cladosporium herbarum (Persoon: Fries) Link, Cladosporium cladosporioides (Fresen.) de Vries, Alternaria alternata (Fr.) Keissler, Acremonium strictum W. Gams, Rhizopus stolonifer (Ehrenberg: Fries)...
Determination of the number of sapwood annual rings in oak in the region of southern Moravia
M. Rybníček, H. Vavrčík, R. Hubený
J. For. Sci., 2006, 52(3):141-146 | DOI: 10.17221/4496-JFS
The paper deals with the determination of the number of sapwood annual rings in oak (Quercus sp.) in relation to altitude, locality and stand age. Several different groups of samples were used from two localities of southern Moravia. The results of the study demonstrate the effects of site water regime and age on the growth of sapwood annual rings. On the other hand, the effect of altitude was not proved. The information can be of crucial importance for the dendrochronological dating of an incomplete sample for particular regions where sapwood is partly or totally missing.