Template-Type: ReDIF-Article 1.0 Author-Name: L. Kulla Author-Workplace-Name: Forest Research Institute in Zvolen, National Forest Centre, Zvolen, Slovakia Author-Name: R. Marušák Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Environmental risk assessment based on semi-quantitative analysis of forest management data Abstract: The paper deals with environmental risk assessment in prevailingly unnatural spruce (Picea abies [L.] Karst.) forests in three regions with different patterns of forest damage in the Slovak part of the West Carpathians. Logistic regression was used to estimate the effect of 7 site-related, 5 stand-related and 2 anthropogenic factors on the probability that critical forest damage will occur. The results show that regression models can describe cause-effect relationships in regions with different regimes of forest decline. Stand age, proportion of spruce, and distance from the focus of biotic agent activity predicted decline in two regions with generally lower elevation in northern Slovakia (Kysuce and Orava). In a mountain region (Low Tatras), the importance of factors contributing to the static stability of trees and position towards dangerous winds increased significantly. The quality of the derived models and prospects for their usefulness in risk assessment are discussed. Keywords: ecological factors, forest damage, forest management, logistic regression, Norway spruce, risk assessment Journal: Journal of Forest Science Pages: 89-95 Volume: 57 Issue: 3 Year: 2011 DOI: 10.17221/35/2010-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/35/2010-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201103-0001.txt Handle: RePEc:caa:jnljfs:v:57:y:2011:i:3:id:35-2010-JFS Template-Type: ReDIF-Article 1.0 Author-Name: L. Menšík Author-Workplace-Name: Department of Forest Ecology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: E. Kula Author-Workplace-Name: Department of Forest Protection and Game Management, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Title: Forest floor and soils in limed stands of substitute species in Klášterec nad Ohří forest district in the Krušné hory Mts. Abstract: Forest ecosystems of the Krušné hory Mts. affected by long-term air pollution were finally disintegrated. The tree species composition has been changed in ecosystems disturbed in this way. Liming applied for the long-term revitalization of air-polluted areas partly decreased the effects of acid depositions on soil in spite of the reduction of air pollution; however, it did not cause any expected necessary changes yet. The aim of the paper is to evaluate the chemical composition of humus horizon H and organomineral horizon Ah (soil reaction, sorption complex, C/N ratio, available nutrients) in stands of substitute tree species differently affected by liming and site preparation in the area of Klášterec nad Ohří Forest District in the Krušné hory Mts. (Czech Republic). Based on our evaluations, we found out that pH values increased by 0.3-0.5, which was evident in stands with repeated liming at sites without soil preparation and with the site/soil preparation using an excavator or bulldozer. The majority of soils always showed an unsaturated base-exchange complex (< 50%). Increasing values of the sorption complex saturation were evident in stands with repeated liming, which is related to the favourable condition of pH in H and Ah horizons. C/N ratios in the H (Ah) horizon were always below a critical limit (< 24). The content of available nutrients in the H (Ah) horizon was insufficient. Among the particular elements phosphorus content decreased, that of magnesium reached optimum or even surplus, calcium was in surplus (optimum or even surplus), potassium in optimum (surplus). Forest management in the Krušné hory Mts. will be dependent on the effectiveness of the biological and chemical revitalization of soils also in the future. Keywords: forest floor, Krušné hory Mts., liming, soil, stands of substitute species Journal: Journal of Forest Science Pages: 96-106 Volume: 57 Issue: 3 Year: 2011 DOI: 10.17221/22/2010-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/22/2010-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201103-0002.txt Handle: RePEc:caa:jnljfs:v:57:y:2011:i:3:id:22-2010-JFS Template-Type: ReDIF-Article 1.0 Author-Name: L. Šálek Author-Workplace-Name: Department of Forest Management, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic Author-Name: P. Hejcmanová Author-Workplace-Name: Department of Forest Management, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic Title: Comparison of the growth pattern of black walnut (Juglans nigra L.) in two riparian forests in the region of South Moravia, Czech Republic Abstract: The black walnut (Juglans nigra L.), an introduced species into the Czech Republic, is planted for its production of valuable timber. A systematic study of the black walnut growth rate at different localities and consequently the creation of standard volume tables under Central European conditions therefore appear to be of high relevance. The aim of our study was to reveal the black walnut growth pattern in its pure stands in two riparian forests along the Morava and Svratka River (Strážnice locality and Židlochovice locality, respectively). To describe and to compare relationships among diameter at breast height (dbh), tree height and age, we used a forest management plan and measured 573 and 670 trees in pure sample stands at Strážnice and Židlochovice, respectively. We found out that the measured mean DBH and mean height were consistently higher in Strážnice, however the relationships of DBH to height, age to DBH, and age to height showed the same pattern at both localities. The mean heights of trees were 16.3, 24.1, 28.7, 31.9, and 34.5 m in 20, 40, 60, 80, and 100 year age classes and were consistently taller in comparison with other, mainly European, regions. Therefore our results suggest the high potential of black walnut in timber production in riparian forests in the Czech Republic, mainly in the South Moravian region. Keywords: growth, Juglans nigra, riparian forest, South Moravia Journal: Journal of Forest Science Pages: 107-113 Volume: 57 Issue: 3 Year: 2011 DOI: 10.17221/61/2010-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/61/2010-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201103-0003.txt Handle: RePEc:caa:jnljfs:v:57:y:2011:i:3:id:61-2010-JFS Template-Type: ReDIF-Article 1.0 Author-Name: J. Stejskal Author-Workplace-Name: Department of Dendrology and Forest Tree Breeding, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Czech Republic Author-Name: J. Kobliha Author-Workplace-Name: Department of Dendrology and Forest Tree Breeding, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Czech Republic Author-Name: J. Frampton Author-Workplace-Name: Christmas Tree Genetics Program, Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, North Carolina Title: Results of Czech-American cooperation in interspecific fir hybridization in 2008 and 2009 Abstract: This Czech-American research collaboration is investigating interspecific hybridization among various fir species produced via control pollination. Its aim is the development of newly bred material for specific needs of Christmas tree production. The specific target of the breeding is increased growth rate, development of resistance to diseases, insect pests, and limiting environmental conditions (e.g. drought). Experimentation follows a traditional hybridization program of the Czech department focusing on the genus Abies and a long-term breeding program of the American department aimed at Christmas tree production. For hybridization, mainly Mediterranean fir species are used together with American species (especially Abies fraseri) and other species (e.g. Abies koreana). Generally overcoming 5% of viable seeds in the sample can be considered a success. Only few of our hybrid combinations have complied with this condition so far. In 2008 the hybrid combination CZ1 × NC73 brought 16% of viable seeds. In 2009 the most successful hybrid combination CZ1 × FF81 brought 6% of viable seeds. These crossing experiments will initially be followed by Phytophthora cinnamomi resistance screening trials. Keywords: Abies, Abies fraseri, Christmas tree production, hybridization, Phytophthora cinnamomi Journal: Journal of Forest Science Pages: 114-122 Volume: 57 Issue: 3 Year: 2011 DOI: 10.17221/80/2010-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/80/2010-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201103-0004.txt Handle: RePEc:caa:jnljfs:v:57:y:2011:i:3:id:80-2010-JFS Template-Type: ReDIF-Article 1.0 Author-Name: V. Gryc Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: H. Vavrčík Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: K. Horn Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Title: Density of juvenile and mature wood of selected coniferous species Abstract: The objective of research was to determine the density of juvenile (JW) and mature wood (MW) of selected coniferous species growing in the Czech Republic. The research included the wood of Norway spruce (Picea abies (L.) Karst.), Scots pine (Pinus sylvestris L.) and European larch (Larix decidua Mill.). The juvenile wood density close to the pith was 410 kg.m-3 for spruce, 391 kg.m-3 for pine and 573 kg.m-3 for larch with 12% water content. Mature wood in the peripheral parts had the higher density in all species - spruce 516 kg.m-3, pine 552 kg.m-3 and larch 652 kg.m-3. The highest difference, the difference of 161 kg.m-3, between juvenile and mature wood was found out in Scots pine. The large difference in the wood density of pine is caused by a considerable difference in the mean ring width of its juvenile and mature wood. Further, it was proved that wood density decreases with the increasing ring width while wood density increases with the increasing proportion of latewood. Keywords: density, juvenile wood, larch, mature wood, Norway spruce, Scots pine Journal: Journal of Forest Science Pages: 123-130 Volume: 57 Issue: 3 Year: 2011 DOI: 10.17221/18/2010-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/18/2010-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201103-0005.txt Handle: RePEc:caa:jnljfs:v:57:y:2011:i:3:id:18-2010-JFS