Template-Type: ReDIF-Article 1.0 Author-Name: Vilém PODRÁZSKÝ Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Zdeněk VACEK Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Ivo KUPKA Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Stanislav VACEK Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Michal TŘEŠTÍK Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jan CUKOR Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Effects of silver fir (Abies alba Mill.) on the humus forms in Norway spruce (Picea abies (L.) H. Karst.) stands Abstract: The effects of silver fir (Abies alba Miller) on the soil compared to Norway spruce (Picea abies (Linnaeus) H. Karsten) were evaluated. Altitude of the study site is 790 m a.s.l., mild slope of 10° facing SW, forest site is spruce-beech on acid soil. The forest floor and top soil horizons (L + F1, F2 + H, Ah) were sampled in 4 replications beneath unmixed Norway spruce and silver fir groups. Comparing the soil-forming effects of both species, few significant differences were found in the Ah horizon - contents of total C, N, exchangeable Al and plant available Ca were higher beneath spruce. The soil improving role of silver fir compared to spruce was confirmed at the studied locality. Keywords: forest soils, soil chemistry, humus accumulation, coniferous species influence on soil Journal: Journal of Forest Science Pages: 245-250 Volume: 64 Issue: 6 Year: 2018 DOI: 10.17221/19/2018-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/19/2018-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201806-0001.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:6:id:19-2018-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Aysan BADRAGHI Author-Workplace-Name: Department of Forest Technology, Faculty of Environmental Sciences, Technical University Dresden, Tharandt, Germany Author-Name: Jörn ERLER Author-Workplace-Name: Department of Forest Technology, Faculty of Environmental Sciences, Technical University Dresden, Tharandt, Germany Author-Name: Seyed Ata Ollah HOSSEINI Author-Workplace-Name: Department of Forestry and Forest Economics, Faculty of Natural Resources, University of Tehran, Tehran, Iran Author-Name: Robert LANG Author-Workplace-Name: Department of Forest Technology, Faculty of Environmental Sciences, Technical University Dresden, Tharandt, Germany Title: Evaluation of animal logging in the mixed broadleaved mountain forest: Economic and environmental impacts Abstract: This investigation assessed the economic and environmental impacts of small-scale wood logging by mules in the mixed broadleaved mountain forest. To develop a time prediction model, all measurements of time are replaced by their decadic logarithms. Unit cost was calculated by two methods: (i) as usual, division of the system cost by average productivity per hour, (ii) on the basis of the developed logarithmic models. To investigate the residual damage a 100% inventory method was employed in pre- and post-hauling, alongside the mule trail. A core sampling technique of bulk density was used for determining the degree of soil compaction, and soil disturbed widths were measured at a 5-m interval in the mule hauling direction. In this research, computed unit cost was 17.2 EUR.m-3 and estimated unit cost by the logarithmic model was 16.2 EUR.m-3. This result highlights the time consumption which estimated by the developed model was at a close ratio with real time (average at 95%). In terms of environmental impact, the results indicated that 5.7% of regenerations and 0% of trees were damaged. Also we found that the increased bulk density was not significant (P = 0.903) and only about 0.2% of the total area was disturbed. Keywords: productivity and cost, logarithm, mule, residual damage, soil damage Journal: Journal of Forest Science Pages: 251-259 Volume: 64 Issue: 6 Year: 2018 DOI: 10.17221/18/2018-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/18/2018-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201806-0002.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:6:id:18-2018-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Maryam KAZEMPOUR LARSARY Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, University of Guilan, Somehsara, Iran Author-Name: Kambiz TAHERI ABKENAR Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, University of Guilan, Somehsara, Iran Author-Name: Hassan POURBABAEI Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, University of Guilan, Somehsara, Iran Author-Name: David POTHIER Author-Workplace-Name: Centre d'étude de la forêt (CEF), Québec, Canada Author-Name: Beitollah AMANZADEH Author-Workplace-Name: Center of Research and Education of Agriculture and Natural Resources of Guilan Province, Rasht, Iran Title: Spatial patterns of trees from different development stages in mixed temperate forest in the Hyrcanian region of Iran Abstract: Mixed beech (Fagus orientalis Lipsky) forests are very important to the Hyrcanian region of Iran because of their high degree of naturalness and as a source of wood production. Determination of tree spatial patterns over development stages is a first step in understanding underlying processes driving regeneration and forest dynamics. Spatial patterns of trees from three development stages (initial, optimal and decay) of an untouched mixed beech forest were quantified within three 1-ha plots. To prepare the stem maps, we measured each tree with a DBH larger than 7.5 cm using the azimuth-distance method. Spatial patterns were then analysed using Ripley's K-function. Results indicated that the number of trees decreased from the initial stage to the decay stage, with tree spatial patterns being aggregated, slightly aggregated and highly randomized for initial, optimal and decay stages, respectively. Differences in spatial patterns among the development stages are not unexpected considering that such unmanaged forests are driven by gap dynamics which results in interactions between gap filling individuals. Keywords: close-to-nature silviculture, gap dynamics, mixed beech forests, Ripley's K-function Journal: Journal of Forest Science Pages: 260-270 Volume: 64 Issue: 6 Year: 2018 DOI: 10.17221/7/2018-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/7/2018-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201806-0003.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:6:id:7-2018-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Ondřej SCHÖNFELDER Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Aleš ZEIDLER Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Vlastimil BORŮVKA Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Lukáš BÍLEK Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Martin LEXA Author-Workplace-Name: Department of Wood Processing, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Shrinkage of Scots pine wood as an effect of different tree growth rates, a comparison of regeneration methods Abstract: The Scots pine (Pinus sylvestris Linnaeus) is one of the most important commercial tree species in Central Europe, yet we know very little about the variability of its wood properties. The aim of this study is to primarily analyse the impact of different tree growth rates and site characteristics on the shrinkage of Scots pine wood. The investigated forest stands are located at two sites of the Czech Republic that are characteristic for Scots pine silviculture. At each site, sample trees were selected from two stands representing two variants of the silvicultural treatment, i.e. a clear-cutting and shelterwood system with long regeneration period. Wood shrinkage in radial and tangential directions and volumetric shrinkage were determined in accordance with Czech standards. Lower values of shrinkage were found out in forest stands regenerated by the shelterwood method. The wood in the central part of the trunk shows lower shrinkage values than in the basal part in both stands. The unambiguous effect of the horizontal position in the trunk stem was demonstrated in forest stands regenerated by the clear-cutting method, whilst stands regenerated by the shelterwood method showed a more even distribution of shrinkage along the trunk width. Furthermore, it was found that the shrinkage of the Scots pine has a medium dependence on wood density. Keywords: Pinus sylvestris L., wood physical properties, dimensional changes, management system, stand structure Journal: Journal of Forest Science Pages: 271-278 Volume: 64 Issue: 6 Year: 2018 DOI: 10.17221/23/2018-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/23/2018-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201806-0004.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:6:id:23-2018-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Slavica PAPIĆ Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Václav BURIÁNEK Author-Workplace-Name: Department of Forest Tree Species Biology and Breeding, Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Name: Roman LONGAUER Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Tomáš KUDLÁČEK Author-Workplace-Name: Department of Forest Protection and Wildlife Management, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Jiří ROZSYPÁLEK Author-Workplace-Name: Department of Forest Protection and Wildlife Management, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Title: Phenotypic variability of Fraxinus excelsior L. and Fraxinus angustifolia Vahl under the ash dieback disease in the Czech Republic Abstract: The study was carried out in the experiment with 16 provenances of common ash (Fraxinus excelsior Linnaeus) and 2 provenances of narrow-leaved ash (Fraxinus angustifolia Vahl) at a series of 5 parallel trial plots established in a gradient from lowland riverine to upland ravine sites. The role of the site, ash species and the provenance of common ash proved to have significant effects on the intensity of ash dieback (ADB) associated with the infection by Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya at the age of 20 years. Narrow-leaved ash was healthier, surviving and growing better than common ash on the trials situated inside as well as beyond its natural range. The ADB intensity was lower in the medium altitude and more easterly located trial plots with a more continental climate. The provenance of forest reproductive material proved to have a significant effect on the ADB damage and survival rate as well as the growth of ash across the trial plots of the experiment. Keywords: Hymenoscyphus fraxineus, common ash, narrow-leaved ash, site, species, provenance effects Journal: Journal of Forest Science Pages: 279-288 Volume: 64 Issue: 6 Year: 2018 DOI: 10.17221/30/2018-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/30/2018-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201806-0005.txt Handle: RePEc:caa:jnljfs:v:64:y:2018:i:6:id:30-2018-JFS