Template-Type: ReDIF-Article 1.0 Author-Name: Pavel Brabec Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jakub Brichta Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Zdeněk Vacek Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Stanislav Vacek Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Václav Šimůnek Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Vojtěch Hájek Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Potential of mixed Picea abies (L.) Karst. and Pinus sylvestris L. forests in lowland areas of Central Bohemia Abstract: Mixed forests play a key role in terms of stability, production potential, and adaptation to climate change. In addition, the studied Norway spruce [Picea abies (L.) Karst.] and Scots pine (Pinus sylvestris L.) belong to the most economically important tree species in Europe. The objectives were to determine the effect of the species composition of these two tree genera on the production, structure, diversity, and growth of mixed stands at lower elevations in the Czech Republic. Based on dendroecological samples, research was also carried out on the influence of climatic factors and climate change on the radial growth of these trees of interest. Mixed forests showed higher timber production by 29.8% compared to spruce and pine monocultures. The production of mature stands ranged from 328 to 479 m3.ha-1. Spruce achieved higher radial growth, but its growth variability was higher than that of pine. Compared to precipitation, temperatures had a greater influence on the radial growth of both tree species, especially in the growing season. In terms of diversity, mixed stands achieved significantly higher structural differentiation and overall diversity compared to monospecific variants. Mixed stands can achieve higher production potential, diversity, and especially resistance to climatic extremes in the lowland regions of the Czech Republic. The differences between mixed stands and monocultures, i.e. the effect of tree species mixing, depend on the appropriate proportions of tree species and their spatial pattern. Keywords: climate change, dendrochronology, Norway spruce,  productivity, Scots pine Journal: Journal of Forest Science Pages: 470-484 Volume: 69 Issue: 11 Year: 2023 DOI: 10.17221/76/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/76/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202311-0001.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:11:id:76-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Simon Berg Author-Workplace-Name: Department of Forest Operations and Digitalization, Norwegian Institute of Bioeconomy Research (NIBIO), Ås, Norway Title: Simulating differences between forwarding short and normal-length timber Abstract: Normal log lengths in Norway are 3-6 m (NL), but occasionally there is a demand for short timber with a 2.5 m log length (ST). There are concerns that ST could reduce the forwarders' productivity. Six type stands were created based on harvester data. Different assortment distributions, conditions, and forwarders were simulated in each type stand. It was found that an additional ST assortment almost always decreased productivity (from -15.5 to +4%). Increased forwarding distance (m), more difficult driving conditions, and increased log concentration [m3.(100 m strip road)-1] decreased the productivity difference between sites with ST and NL and sites with only NL. Increased forwarder size increased the productivity difference between sites with ST and NL and sites with only NL. It is possible to load two stacks of ST on some forwarders. Such loading was more productive than loading one stack on longer forwarding distances, while the opposite was the case on short distances. However, loading two stacks of ST can lead to overloading. Keywords: analysis of covariance (ANCOVA), clear cutting, comparative study, computer simulations, relative difference, terrain transportation Journal: Journal of Forest Science Pages: 485-496 Volume: 69 Issue: 11 Year: 2023 DOI: 10.17221/41/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/41/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202311-0002.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:11:id:41-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Pavel Švagr Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Josef Gallo Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jan Vítámvás Author-Workplace-Name: Department of Forest Ecology, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic 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: Martin Baláš Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Potential of Morus nigra in Central Europe focused on micropropagation: A short review Abstract: This paper is focused on the description of the black mulberry (Morus nigra), its ecology and the possibilities of its in vitro propagation for quick and efficient obtaining of a large quantity of clones in a relatively short time for subsequent planting or sale. Due to ongoing climate change, it is considerable to use mulberry trees in horticulture, agroforestry and forestry under the conditions of Central Europe. The use of the mulberry is conditioned by the availability of planting stock. A proven and successful method of mulberry propagation is in vitro cultivation. Based on literature review, the recommended composition of planting media and other procedures for in vitro cultivation of mulberries are presented. The aim of the article is to inform foresters about the possibilities of using the black mulberry tree in our conditions and, using its example, to point out the possibility of using non-standard species of trees both as part of adaptation measures to the expected climate change and as one of the options for increasing the biodiversity of the landscape. Keywords: black mulberry, climate change, micropropagation, Rosales, silviculture Journal: Journal of Forest Science Pages: 463-469 Volume: 69 Issue: 11 Year: 2023 DOI: 10.17221/73/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/73/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202311-0003.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:11:id:73-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Vladimir Tanovski Author-Workplace-Name: Department of Forest Management, Hans Em Faculty of Forest Sciences, Landscape Architecture and Environmental Engineering, Ss. Cyril and Methodius University in Skopje, Skopje, North Macedonia Author-Name: Bratislav Matović Author-Workplace-Name: Institute of Lowland Forestry and Environment, University of Novi Sad, Novi Sad, Serbia Author-Name: Mihajlo Risteski Author-Workplace-Name: Department of Forest and Wood Protection, Hans Em Faculty of Forest Sciences, Landscape Architecture and Environmental Engineering, Ss. Cyril and Methodius University in Skopje, Skopje, North Macedonia Author-Name: Pande Trajkov Author-Workplace-Name: Department of Forest Management, Hans Em Faculty of Forest Sciences, Landscape Architecture and Environmental Engineering, Ss. Cyril and Methodius University in Skopje, Skopje, North Macedonia Title: Modelling the tree height-diameter relationship of Macedonian pine (Pinus peuce Gris.) forests in North Macedonia Abstract: The most crucial individual tree variables in forest management are diameter at breast height (DBH) and height of trees (H). Projection of stand development over time relies on accurate height-diameter functions. The main aim of this paper is to define the best usable model for tree height prediction from diameter at breast height. We explore the place where the Macedonian pine was discovered in the Baba Mountain in the Pelister National Park in North Macedonia. Thus, we established 48 experimental plots (EP) with a circle shape, a radius of 12.62 m and an area of 500 m2 each. The EP were established in pure Macedonian pine stands in an elevation gradient between 950 m a.s.l. and 1 700 m a.s.l. Every tree in the EP was attributed with data for diameter at breast height, tree height, and stand characteristics data (elevation, slope, aspect, coordinate) as well. For predicting the tree height, we used 40 models from many authors which are the most usable in forest practice. Also, we prepared evaluations and tests for all models, in order to choose the best responsive model for the Macedonian pine forest. For predicting the best tree height model for Macedonian pine, we decided on Mamoun's equation, with a high correlation value of 0.85 with 73% out of the observed data. Also, this model showed a lower root mean square error of 32.65, a lower model prediction accuracy of 6.77, and a lower mean absolute percent error of 11.73%. Finally, it can be concluded that the nonlinear connection between DBH and tree height is the most responsive regression model. Keywords: connection, diameter at breast height, equations, predictions, tree height Journal: Journal of Forest Science Pages: 497-513 Volume: 69 Issue: 11 Year: 2023 DOI: 10.17221/68/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/68/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202311-0004.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:11:id:68-2023-JFS