Template-Type: ReDIF-Article 1.0 Author-Name: E. Kula Author-Workplace-Name: Brno, Czech Republic Author-Name: M. Stoklasa Author-Workplace-Name: Brno, Czech Republic Title: LANDSAT and its application to evaluate the dynamics of the health condition of birch stands Abstract: Methods were elaborated that would specify factors affecting the accuracy of the output of LANDSAT satellite images used to evaluate the dynamics of changes in the health condition of birch stands. In the period of investigations, in 1994-2000, the foliage of birch stands was very thin as a consequence of the large-scale absence of flushing in 1997. The output of this method is also specification of the degree of foliage of birch trees based on the altitude, stand age and forest site types in the air-polluted area of the Krušné hory Mts. (Northern Bohemia). These methods can be applied to other broadleaved stands. Keywords: Betula pendula Roth, health condition, LANDSAT monitoring, methodology Journal: Journal of Forest Science Pages: 241-251 Volume: 49 Issue: 6 Year: 2003 DOI: 10.17221/4698-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4698-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200306-0001.txt Handle: RePEc:caa:jnljfs:v:49:y:2003:i:6:id:4698-JFS Template-Type: ReDIF-Article 1.0 Author-Name: T. Samek Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Diapause of Cameraria ohridella Deschka et Dimic and its impact on the species population dynamics Abstract: Cameraria ohridella Deschka et Dimic is a polyvoltine species which can complete under suitable conditions the development of as many as three generations a year. In the Czech Republic, however, the third generation suffers from high mortality due to the shortage of food and later also unfavourable weather. If the third generation is not completed the population continuity is ensured by diapausing pupae occurring in each generation. The number of diapausing pupae is determined by the actual abundance of the species and thus also by the actual damage to the horse chestnut (Aesculus hippocastanum L.) foliage. Relationships of the parameters were investigated in the first generation of C. ohridella and their intensity was studied by methods of regression analysis. Keywords: Cameraria ohridella, Aesculus hippocastanum, diapause, pupa, regression analysis Journal: Journal of Forest Science Pages: 252-258 Volume: 49 Issue: 6 Year: 2003 DOI: 10.17221/4699-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4699-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200306-0002.txt Handle: RePEc:caa:jnljfs:v:49:y:2003:i:6:id:4699-JFS Template-Type: ReDIF-Article 1.0 Author-Name: P. Haltofová Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Author-Name: L. Jankovský Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Distribution of sweet chestnut Castanea sativa Mill. in the Czech Republic Abstract: Sweet chestnut Castanea sativa Mill. is an introduced species in the Czech Republic. It is recorded roughly from 300 localities. To the end of 2002, the occurrence of chestnut was verified at about 140 macrolocalities. The most northern locality recorded so far was Choustníkovo Hradiště in the region of Hradec Králové. Chestnuts occur generally to an altitude of 500 m (80% of all examined localities), at higher altitudes they suffer from climatic extremes particularly late frosts. The occurrence of chestnut was recorded at 27 localities (ca. 20% localities under investigation) where altitudes exceed 500 m. The highest location of chestnut is locality Nejdek, Karlovy Vary District where chestnut trees thrive at an altitude of 678 m. At altitudes over 600 m, two other localities were recorded. The health condition of chestnut is relatively good. At some localities, however, crown drying occurs as a result of not quite ideal climatic conditions. Within our research, quarantine Cryphonectria parasitica (Murr.) Barr. was determined for the first time in the Czech Republic at the only examined locality. Keywords: Castanea sativa, chestnut, distribution, Czech Republic, Cryphonectria parasitica, ecology Journal: Journal of Forest Science Pages: 259-272 Volume: 49 Issue: 6 Year: 2003 DOI: 10.17221/4700-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4700-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200306-0003.txt Handle: RePEc:caa:jnljfs:v:49:y:2003:i:6:id:4700-JFS Template-Type: ReDIF-Article 1.0 Author-Name: M. Modrý Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Author-Name: D. Hubený Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Impact of skidder and high-lead system logging on forest soils and advanced regeneration Abstract: The applied skidding technology strongly influences the impact of harvest on the ecosystem and success of natural regeneration. The impact of skidder SLKT 81 and high-lead system Larix 3T on forest soil and natural regeneration was compared under analogical site and stand conditions in a production beech forest in the environs of Brno, Czech Republic. The skidder was found to have greater effects on the soil surface consistency, soil properties and natural regeneration than the high-lead system operations. Although high-lead system operations are more friendly to all parts of forest ecosystem, the skidder may not cause excessive damage when applied under suitable terrain and climatic conditions. Keywords: high-lead system, skidder, forest soil, natural regeneration, disturbance, harvest technology Journal: Journal of Forest Science Pages: 273-280 Volume: 49 Issue: 6 Year: 2003 DOI: 10.17221/4701-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4701-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200306-0004.txt Handle: RePEc:caa:jnljfs:v:49:y:2003:i:6:id:4701-JFS Template-Type: ReDIF-Article 1.0 Author-Name: P. Král Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Author-Name: J. Hrázský Author-Workplace-Name: Mendel University of Agriculture and Forestry, Faculty of Forestry and Wood Technology, Brno, Czech Republic Title: Effect of negative factors on the use of oak and beech for decorative veneers Abstract: The paper summarizes results of an institutional research aimed at the analysis of relationships between the quality of decorative veneers of oak and beech and negative factors decreasing the use of veneers. Effects of factors were assessed in the preparation, storage and protection of a raw material, treatment of logs before slicing and stay-log cutting and in the manufacture of veneers proper. Intensity of spraying was measured, protection of raw material during storage and regimes of hydrothermic preparation were assessed. Qualitative yield was determined in 386 logs of a diameter from 34 to 66 cm comparing four methods of cutting: half-round cutting and two-sized slicing with half-round cuttingand stay-log cutting of ahalf-round log and a whole log. The quality of veneers is also affected by the relative position and quality of cutting tools. Results of the paper consist in conclusions and recommendations for the better and more complete use of oak and beech to obtain quality veneers. The paper sets conditions for storage and protection, raw material preparation and regimes of hydrothermic treatment. Based on the research results we recommend to cut logs of oak of 30 to 40 cm diameter from two opposite sides (two-sided slicing) with the subsequent cutting into two parts. Each of the parts is sliced separately to a residual board. It is suitable logs of oak of 40 to 66 cm diameter to be lengthwise trimmed from two or four faces and then cut into two parts. It is recommended logs of beech of 30 to 44 cm diameter to be stay-log cut without lengthwise division in the whole log and logs over 44 cm diameter to be stay-log cut when divided into two parts. The necessary precondition of a quality veneer with a smooth surface and uniform thickness is keeping the geometry of cutting tools. It is necessary to check regularly determined parameters of a knife and nose bar in relation to a bolt. The nose bar and knife have to be made from a suitable material not causing colouring. Keywords: veneer, qualitative yield, cutting, half-round cutting, stay-log cutting, oak, beech Journal: Journal of Forest Science Pages: 281-289 Volume: 49 Issue: 6 Year: 2003 DOI: 10.17221/4702-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4702-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-200306-0005.txt Handle: RePEc:caa:jnljfs:v:49:y:2003:i:6:id:4702-JFS