Template-Type: ReDIF-Article 1.0 Author-Name: J. Urban Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Diagnostics of bark beetles of the genus Pityokteines Fuchs important in forestry Abstract: 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 3.3% wider than their shield. Males of P. spinidens have wing cases on average 1.0% narrower (females 2.1% wider) than their shield. Males of P. vorontzowi have wing cases on average 1.3% narrower than their shield, females have wing cases equally wide as their shield. The longest tail-like hair of the shield front edge (about 0.38 mm) occurs in females of P. spinidens, much more shorter (about 0.26 mm) in P. curvidens and shortest (about 0.23 mm) in P. vorontzowi. In females of P. curvidens, the hair of forehead as against the hair of shield is shorter on average by 8.3, in P. spinidens by 5.6 and in P. vorontzowi by 9.5%. Based on the length of the shield hair it is possible to distinguish reliably females of P. spinidens and according to short (0.12 mm) bristles on the rear of wing cases females of P. vorontzowi. A longitudinal central keel occurs on the forehead of 80% males of all three species and 72% females of P. vorontzowi. A figure defined by the teeth of the 2nd and the 5th pair in females of P. curvidens on the rear of wing cases is an isosceles trapezoid that approaches (or is almost equal) to a rectangle. In P. spinidens, it is quite a well-marked (in P. vorontzowi well-marked) trapezoid. It has been found that the shape and size of these figures are the main characteristics for species determination of females of the genus Pityokteines. Keywords: Pityokteines curvidens, P. spinidens, P. vorontzowi, diagnostic characteristics, sexual dimorphism Journal: Journal of Forest Science Pages: 329-341 Volume: 48 Issue: 8 Year: 2002 DOI: 10.17221/11925-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11925-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200208-0001.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:8:id:11925-JFS Template-Type: ReDIF-Article 1.0 Author-Name: O. Mauer Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Author-Name: E. Palátová Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Mountain ash (Sorbus aucuparia L.) root system morphogenesis Abstract: 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 into deeper soil horizons than roots growing in the downhill direction). An unambiguous correlation was found between the rooting depth of anchor roots and the number and reach of lateral roots (the longer the anchors, the fewer the lateral roots and the smaller their reach). The shorter the anchor roots, the more intensive the branching of not only the anchors themselves but also of superficial roots. Keywords: mountain ash, root system, morphogenesis Journal: Journal of Forest Science Pages: 342-350 Volume: 48 Issue: 8 Year: 2002 DOI: 10.17221/11894-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11894-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200208-0002.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:8:id:11894-JFS Template-Type: ReDIF-Article 1.0 Author-Name: E. Kula Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: The leafhopper fauna in birch (Betula pendula Roth) stands Abstract: 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, weakens birch growth due to the leaf-sucking activities of the insects. Keywords: birch (Betula pendula Roth), fauna of leafhoppers, photoeclectors, ground traps, shaking down, air-polluted area Journal: Journal of Forest Science Pages: 351-360 Volume: 48 Issue: 8 Year: 2002 DOI: 10.17221/11895-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11895-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200208-0003.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:8:id:11895-JFS Template-Type: ReDIF-Article 1.0 Author-Name: L. Heralt Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Using the roadeng system to design an optimum forest road variant aimed at the minimization of negative impacts on the natural environment Abstract: 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. Keywords: forest road design, ROADENG system, DMT (DEM) method, soil conservation, secondary drainage network Journal: Journal of Forest Science Pages: 361-365 Volume: 48 Issue: 8 Year: 2002 DOI: 10.17221/11926-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11926-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200208-0004.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:8:id:11926-JFS Template-Type: ReDIF-Article 1.0 Author-Name: M. Sarvaš Author-Workplace-Name: Forest Research Institute, Zvolen, Slovak Republic Title: 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 system Abstract: 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 stress did not affect the rate of electrolyte leakage (the rate of REL did not correlate with the intensity of stress treatment). Keywords: desiccation and frost stress, electrolyte leakage, Norway spruce, seedlings root system, survival Journal: Journal of Forest Science Pages: 366-371 Volume: 48 Issue: 8 Year: 2002 DOI: 10.17221/11928-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11928-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200208-0005.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:8:id:11928-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Š. Kohán Author-Workplace-Name: Forest Research Institute, Research Station, Košice, Slovak Republic Title: Preliminary results of research on main growth characteristics of different poplar clones in ecological conditions of Východoslovenská Lowland Abstract: 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 per 1 ha. The growth of P. Rochester 20/66 poplar was considerably much slower: its mean height amounted to 17.3 m, mean diameter to 18.7 cm and average annual volume increment was 6.3 m3 per 1 ha. It will be necessary to carry out further studies to obtain more detailed values for these clones. Keywords: poplars, height and diameter growth, volume production, Východoslovenská Lowland Journal: Journal of Forest Science Pages: 372-376 Volume: 48 Issue: 8 Year: 2002 DOI: 10.17221/11896-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/11896-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200208-0006.txt Handle: RePEc:caa:jnljfs:v:48:y:2002:i:8:id:11896-JFS