Template-Type: ReDIF-Article 1.0 Author-Name: Ivo KUPKA Author-Name: Martin BALÁŠ Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Stanislav MILTNER Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Quantitative and qualitative evaluation of Northern red oak (Quercus rubra L.) in arid areas of North-Western Bohemia Abstract: The article analyses growth and quality of Northern red oak (Quercus rubra Linnaeus) based on 13 research plots (seven in red oak stands and six in sessile oak stands) with the ages between 17 to 159 years. The collected data includes height, DBH, crown diameter, stem and crown quality, health status of each tree on the plot. Analogous plots were chosen in sessile oak (Quercus sessilis Linnaeus) stands on similar sites to get reference data. The results proved the high wood production potential of red oak when compared to sessile oak being at the same or higher quality and health. The data propose the red oak to be a good additional species in lowland stands. Keywords: exotic oak, domestic oak, growth, tree quality, stand quality, health status Journal: Journal of Forest Science Pages: 53-58 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/147/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/147/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0001.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:147-2017-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Pejman PARHIZKAR Author-Name: Majid HASSANI Author-Workplace-Name: Forest Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran Author-Name: Mohammad Hossein SADEGHZADEH HALLAJ Author-Workplace-Name: Forest Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran Title: Gap characteristics under oriental beech forest development stages in Kelardasht forests, northern Iran Abstract: This study was carried out to evaluate gap characteristics and gapmakers for different development stages of an oriental beech forest in northern Iran. Development stages of 1 ha square-shaped mosaic patches were identified using 100 × 100 m sampling grid and all gaps within these mosaics were recorded. Gap areas were calculated and classified into four classes and gapmakers were counted and classified into 4 decay and 4 diameter classes as well. Results showed that gaps comprised 13.7, 9.1 and 17.6% of the study area in initial, optimal and decay stages, respectively. There was a significant difference between development stages with respect to gap size and the highest amount was observed in decay stage. Medium-sized gaps were the most frequent in all three stages. Frequency distribution of gapmakers varied among development stages. Our findings revealed that 200-500 m2 is the most preferable gap size for close-to-nature silvicultural approaches in Hyrcanian beech forests. To achieve this gap size 1-2 trees should be marked for harvesting operations. Keywords: close-to-nature silviculture, forest stand, stand dynamics, gapmaker, silviculture Journal: Journal of Forest Science Pages: 59-65 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/59/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/59/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0002.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:59-2017-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Roman GEBAUER Author-Workplace-Name: Department of Forest Botany, Dendrology and Geobiocoenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Daniel VOLAŘÍK Author-Workplace-Name: Department of Forest Botany, Dendrology and Geobiocoenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Josef URBAN Author-Workplace-Name: Department of Forest Botany, Dendrology and Geobiocoenology, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Workplace-Name: Laboratory of Ecosystems Biogeochemistry, School of Ecology and Geography, Siberian Federal University, Krasnoyarsk, Russia Title: Seasonal variations of sulphur, phosphorus and magnesium in the leaves and current-year twigs of hemiparasitic mistletoe Loranthus europaeus Jacq. and its host Quercus pubescens Willd. Abstract: The objectives of this research were to investigate nutrient seasonal dynamics in the hemiparasitic mistletoe Loranthus europaeus von Jacquin and its host Quercus pubescens Willdenow, and to evaluate nutrient relationships between mistletoe and its host. For these purposes, S, P and Mg concentrations in the leaves and current-year twigs were analysed 12 times during the growing season. We found that the studied nutrients were not retrieved from hemiparasitic mistletoe leaves prior to abscission, contrary to its host. The seasonal dynamics of S, P, and Mg in L. europaeus and Q. pubescens leaves differed from each other while in current-year twigs the dynamics was similar in both species. In general, nutrient concentrations in the leaves and current-year twigs were higher in mistletoe compared with its host. But the mistletoe to host nutrient ratios varied greatly during the growing season, especially in leaves, mostly during leaf expansion and senescence. Thus, studies investigating nutrient relationships between mistletoe and its host should be realized during the period of leaf maturity. Keywords: active transport, leaf development, mistletoe-host interaction, nutrient relationships, nutrient remobilization, passive transport Journal: Journal of Forest Science Pages: 66-73 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/144/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/144/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0003.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:144-2017-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Jaroslav HAUSER Author-Workplace-Name: Geostar, spol. s r.o., Brno, Czech Republic Author-Name: Lenka ŠEVELOVÁ Author-Workplace-Name: Department of Landscape Management, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Radek MATULA Author-Workplace-Name: Transport Research Centre, v.v.i., Brno, Czech Republic Author-Name: Petr ZEDNÍK Author-Workplace-Name: Transport Research Centre, v.v.i., Brno, Czech Republic Title: Optimization of low volume road pavement design and construction Abstract: Low volume roads in the Czech Republic are roads with lower traffic volume that primarily include forest and field roads, and they are an integral part of the Czech transport network. When building road pavements, we can use processes for surveying, designing, building and inspecting road constructions included in national and international, particularly European, standards. In addition, the roads are evaluated in terms of their environmental impacts, in order to maintain the quality of the environment. However, during the construction of road pavements decisions based on financial, time and other reasons are made. The decisions have impacts on the operation of roads and lead to other measures and additional costs of repairs and reconstructions. The article summarizes the authors' research results from constructions of low volume road pavements and contains evaluations of laboratory and in situ material tests (soils, layers) of installed road pavements as well as evaluations of modelled laboratory and long-term monitored in situ structures. Keywords: California bearing ratio, compaction, MEPDG, moisture content, soil tests, triaxial shear tests Journal: Journal of Forest Science Pages: 74-85 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/109/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/109/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0004.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:109-2017-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Hana PRKNOVÁ Title: Contribution to seed ecology of Sequoiadendron giganteum (Lindl.) Buchholz growing in the Central European conditions Abstract: The properties of Giant Sequoia (Sequoiadendron giganteum (Lindley) Buchholz) seeds originating from a single cultivated Sequoia tree in the second gene strain in the Czech Republic were examined. The maximum germination level was set at 1.8%. This type is a pyrophyte, but nonetheless the short-term effects of a temperature of 100°C simulating a natural fire are still lethal. The seeds were planted with the same success in one case using a fungicide, which is routine practice in nurseries, and in another case using a "biological method" relying on the positive effect of soil microflora. Both stratified and non-stratified seeds can germinate, but stratification increases the number of germinating individual trees to at least double. Keywords: giant sequoia, germination, stratification, germination level, substrates Journal: Journal of Forest Science Pages: 86-90 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/148/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/148/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0005.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:148-2017-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Farshad KEIVAN BEHJOU Author-Name: Omid GHAFFARZADEH MOLLABASHI Author-Workplace-Name: Department of Natural Resources, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran Title: Effects of tree diameter and some working conditions on residual stump height following selective logging - Short Communication Abstract: The forests in the north of Iran are located on steep terrains. The stump heights were measured in three compartments under selective management in Caspian forests. The objective of this study was to evaluate the effects of site characteristics on stump heights. The trees were felled with a Stihl chainsaw in the region. Each compartment included three slope categories (0-15, 15-30, and 30-60%) and three diameter categories (40-60, 60-80, 80-100 cm). Also, three snow depths were identified in the felling places (0-15, 15-30, and 30-45 cm) because of the felling season. The results of ANOVA test indicated that slope categories and snow depth had significant effects on stump heights (P < 0.01). In addition, the results proved that the stump diameter of harvested trees had no significant effect on residual stump heights (P > 0.05). Besides, there is a multiple linear relationship between stump height (dependent variable) and ground slope and snow depth as the independent variables. Keywords: Caspian forests, stump category, slope classes, diameter category, snow depth Journal: Journal of Forest Science Pages: 91-95 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/100/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/100/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0006.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:100-2017-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Károly RÉDEI Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, National Agricultural Research and Innovation Centre, Sárvár, Hungary Author-Workplace-Name: Hungarian Horticultural Propagation Material Non-profit Ltd., Budapest, Hungary Author-Name: Beatrix BAKTI Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, National Agricultural Research and Innovation Centre, Püspökladány, Hungary Author-Name: Tamás KISS Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, National Agricultural Research and Innovation Centre, Püspökladány, Hungary Author-Name: Marianna TAKÁCS Author-Workplace-Name: Institute of Animal Science, Biotechnology and Nature Conservation, Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Author-Name: Zsolt KESERŰ Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, National Agricultural Research and Innovation Centre, Püspökladány, Hungary Title: Yield and crown structure characteristics in a black locust (Robinia pseudoacacia L.) stand: A case study - Short Communication Abstract: The paper provides the results of a detailed analysis of timber volume and the most important crown variables of black locust (Robinia pseudoacacia Linnaeus) based on an experimental plot in southern Hungary. At the age of 20 years the crop trees belonged to different height classes. If the volume of the mean tree from height class I is considered as 100%, the volume of the mean tree of class II is 44.0%, and the mean tree of class III is only 30.3%. In case of timber volume per 1 m2 crown surface, the values are 72.9 and 61.7%. The DBH of trees showed a positive linear correlation with crown diameter (r = 0.942). Additionally, there were also positive linear relationships between crown diameter and volume (r = 0.901), between crown length and volume (r = 0.721) as well as tree height and crown length (r = 0.661). The variation of crown indices is height even within the same stand and indicates the importance of following a selective thinning operation method. Keywords: forest regeneration, crown indices, crop tree selection, volume production, non-native tree species Journal: Journal of Forest Science Pages: 96-100 Volume: 64 Issue: 2 Year: 2018 DOI: 10.17221/118/2017-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/118/2017-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201802-0007.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:2:id:118-2017-JFS