Journal of Forest Science, 2018 (vol. 64), issue 2
Quantitative and qualitative evaluation of Northern red oak (Quercus rubra L.) in arid areas of North-Western BohemiaOriginal Paper
Ivo KUPKA, Martin BALÁŠ, Stanislav MILTNER
J. For. Sci., 2018, 64(2):53-58 | DOI: 10.17221/147/2017-JFS 
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...
Gap characteristics under oriental beech forest development stages in Kelardasht forests, northern IranOriginal Paper
Pejman PARHIZKAR, Majid HASSANI, Mohammad Hossein SADEGHZADEH HALLAJ
J. For. Sci., 2018, 64(2):59-65 | DOI: 10.17221/59/2017-JFS
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...
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.Original Paper
Roman GEBAUER, Daniel VOLAŘÍK, Josef URBAN
J. For. Sci., 2018, 64(2):66-73 | DOI: 10.17221/144/2017-JFS
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...
Optimization of low volume road pavement design and constructionOriginal Paper
Jaroslav HAUSER, Lenka ŠEVELOVÁ, Radek MATULA, Petr ZEDNÍK
J. For. Sci., 2018, 64(2):74-85 | DOI: 10.17221/109/2017-JFS
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...
Contribution to seed ecology of Sequoiadendron giganteum (Lindl.) Buchholz growing in the Central European conditionsOriginal Paper
Hana PRKNOVÁ
J. For. Sci., 2018, 64(2):86-90 | DOI: 10.17221/148/2017-JFS
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,...
Effects of tree diameter and some working conditions on residual stump height following selective logging - Short CommunicationShort Communication
Farshad KEIVAN BEHJOU, Omid GHAFFARZADEH MOLLABASHI
J. For. Sci., 2018, 64(2):91-95 | DOI: 10.17221/100/2017-JFS
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...
Yield and crown structure characteristics in a black locust (Robinia pseudoacacia L.) stand: A case study - Short CommunicationShort Communication
Károly RÉDEI, Beatrix BAKTI, Tamás KISS, Marianna TAKÁCS, Zsolt KESERŰ
J. For. Sci., 2018, 64(2):96-100 | DOI: 10.17221/118/2017-JFS
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,...