Journal of Forest Science, 2002 (vol. 48), issue 8
Diagnostics of bark beetles of the genus Pityokteines Fuchs important in forestryOriginal Paper
J. Urban
J. For. Sci., 2002, 48(8):329-341 | DOI: 10.17221/11925-JFS 
The paper deals with problems of determination of imagoes (mainly females) in bark beetles of the genus Pityokteines Fuchs. P. curvidens (Germ.) is on average only slightly longer than P. spinidens (Reitt.) and distinctly longer than P. vorontzowi (Jak.). Males are (without lower hooked teeth) equally long as females. The shield of P. curvidens is on average 8% (P. spinidens 12% and P. vorontzowi 13%) longer than wider. Males of P. curvidens have wing cases at shoulders equally wide as their shield, females on average...
Mountain ash (Sorbus aucuparia L.) root system morphogenesisOriginal Paper
O. Mauer, E. Palátová
J. For. Sci., 2002, 48(8):342-350 | DOI: 10.17221/11894-JFS
An analysis is made of the root system morphogenesis and architecture in several tens of European mountain ash trees aged up to 60 years at seven different sites. Although the root system variability is considerable, certain dependences can be derived. European mountain ash forms an anchoring root system. Limiting factors of the root system morphogenesis are the groundwater table (roots do not penetrate into soil horizons affected by underground water), prevailing direction of wind (elliptic root system develops in the wind direction), and the slope (in the uphill direction the roots are shorter, exhibit the more or less horizontal growth and reach...
The leafhopper fauna in birch (Betula pendula Roth) standsOriginal Paper
E. Kula
J. For. Sci., 2002, 48(8):351-360 | DOI: 10.17221/11895-JFS
In birch (Betula pendula Roth) stands of the Děčín sandstone uplands (northern Bohemia) 55 species of leafhoppers were captured using photoeclectors, ground traps and shaking down onto sheets (23,855 specimens of larvae and imagoes). The dominant representatives of the grass and herb undergrowth in birch stands are Jassargus allobrogicus, Anoscopus flavostriatus, Neophilaenus lineatus, Hyledelphax elegantula, Diplocolenus bohemani, Streptanus brevipennis, Macustus grisescens, Planaphrodes bifasciata and Cercopis vulnerata. A heavy abundance of the dominant Oncopis flavicollis and the less abundant O. tristis,...
Using the roadeng system to design an optimum forest road variant aimed at the minimization of negative impacts on the natural environmentOriginal Paper
L. Heralt
J. For. Sci., 2002, 48(8):361-365 | DOI: 10.17221/11926-JFS
The optimization study was carried out in the part of the Jeseníky Mts. region in order to find the optimum variant of a forest road route. The ROADENG system was used for determining the Jezerná forest road design with use of projection above the digital elevation model of terrain. Particular variants of the forest road route were calculated and analyzed on the basis of environmental approach. The final report recommended one of the variants for the final elaboration of project documentation and for construction.
Determination of effects of desiccation and frost stresses on the physiological quality of Norway spruce (Picea abies [L.] Karst.) seedlings by measurement of electrolyte leakage from the root systemOriginal Paper
M. Sarvaš
J. For. Sci., 2002, 48(8):366-371 | DOI: 10.17221/11928-JFS
Two-year, bare-rooted seedlings of Norway spruce (Picea abies [L.] Karst.) were used in this study. The seedlings were exposed to artificial desiccation and frost stress after spring lifting. After exposure to these factors, electrolyte leakage from the root system was measured. The results showed that artificial desiccation significantly affected the rate of electrolyte leakage. The effect of desiccation was confirmed by the survival of plants and height increment (100% survival and 49% height increment of control seedlings in contrast with plants after 6 hours of desiccation: 9% survival and 2% height increment). On the other hand, frost...
Preliminary results of research on main growth characteristics of different poplar clones in ecological conditions of Východoslovenská LowlandOriginal Paper
Š. Kohán
J. For. Sci., 2002, 48(8):372-376 | DOI: 10.17221/11896-JFS
Height and diameter growth and volume production of 22 different clones of poplars were evaluated in Sliepkovce populetum at the age of 12 years. The populetum is situated on medium-heavy and medium humic uninundated alluvia of the Laborec river; typologically, the group of forest types is Ulmeto-Fraxinetum populeum. The results of evaluation documented that among the poplars under study the clones Gigant, OP-229 and BL achieved the best growth and maximum volume production while their mean height amounted to 22.9-23.8 m, mean diameter to 31.9-33.2 cm and average annual volume increment was 25.1-28.3 m3...