Template-Type: ReDIF-Article 1.0 Author-Name: Fruzsina Szabó Author-Workplace-Name: Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Author-Name: Károly Rédei Author-Workplace-Name: Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Author-Name: Tamás Ábri Author-Workplace-Name: Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Author-Workplace-Name: Department of Plantation Forestry, Forest Research Institute, University of Sopron, Püspökladány, Hungary Author-Name: Elza Kovács Author-Workplace-Name: Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Author-Name: Lajos Juhász Author-Workplace-Name: Faculty of Agricultural and Food Sciences and Environmental Management, University of Debrecen, Debrecen, Hungary Title: Stand structure of a juvenile Paulownia Shan Tong plantation grown in the temperate dry climate zone in Hungary - A case study Abstract: In this paper, empirical relationships between diameter at breast height (DBH), crown diameter (CD), and stem number per hectare (N) were improved in a Paulownia Shan Tong plantation. Various functions of these variables were defined, focusing on growing space (Gs) and stem number per hectare. The linear crown index between CD and DBH seems to be particularly important in predicting stem number per hectare. Based on an analysis of the relationships, a CD-DBH (R2 = 0.7254) and a DBH-N graphic model (R2 = 0.7302) can be applied widely in plantation forestry. Under suitable site conditions, the investigated Paulownia hybrid can provide a higher increment in DBH than most of poplar hybrids at a certain age. The aim of this study was to explore the relationships between the Gs based on CD and DBH. These types of investigations are of fundamental importance in terms of the growing technology of tree plantations. Keywords: crown projection area, empress tree, growing space, stem number Journal: Journal of Forest Science Pages: 550-556 Volume: 69 Issue: 12 Year: 2023 DOI: 10.17221/90/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/90/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202312-0001.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:12:id:90-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Radoslav Hlavica Author-Workplace-Name: Department of Forest Management and Applied Geoinformatics, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Zdeněk Adamec Author-Workplace-Name: Department of Forest Management and Applied Geoinformatics, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Title: Development of Douglas fir merchantable stem volume model in the conditions of the Czech Republic Abstract: A precise merchantable stem volume model of Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] is missing in the Czech Republic. The aim of this study was to fit a new model through the reparametrization of volume equations (used in the Czech Republic or in other countries). We tested four volume equations (two from the Czech Republic, one from France and one from British Columbia) in the form of a nonlinear least squares model (NLS), weighted least squares model (WLS), and nonlinear mixed effects model (NLME). In all the tested models, the diameter at breast height of a tree and the total height of a tree were used as independent variables. Models were fitted on a dataset of 185 felled sample trees from eleven research areas with ages between 19-113 years. We have found that the model according to Omule et al. (1987) fits the merchantable stem volume as the best in the version of WLS model. Median value of the relative error of the final model was only -0.53%, which is less than the errors of models which are still used in the Czech Republic today. Keywords: Pseudotsuga menziesii, relative volume error, Smalian equation, stem profiles, stem shape, volume equation Journal: Journal of Forest Science Pages: 515-524 Volume: 69 Issue: 12 Year: 2023 DOI: 10.17221/92/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/92/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202312-0002.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:12:id:92-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Alina Nasibullina Author-Workplace-Name: Institute of Silviculture and Forest Protection, Dresden University of Technology, Tharandt, Germany Author-Name: Marieke van der Maaten-Theunissen Author-Workplace-Name: Chair of Forest Growth and Woody Biomass Production, Dresden University of Technology,Tharandt, Germany Author-Name: Ernst van der Maaten Author-Workplace-Name: Chair of Forest Growth and Woody Biomass Production, Dresden University of Technology,Tharandt, Germany Author-Name: Holger Fischer Author-Workplace-Name: Institute of Silviculture and Forest Protection, Dresden University of Technology, Tharandt, Germany Author-Name: Sven Wagner Author-Workplace-Name: Institute of Silviculture and Forest Protection, Dresden University of Technology, Tharandt, Germany Title: Thinning effects on growth and occurrence of rotting in aspen stands Abstract: Poplar species such as aspen (Populus tremula L.) play a very important role in the forest formation process not only in Eastern European regions. Unfortunately, such aspen stands are often severely affected by fungal diseases, causing mainly core rot. In this study, the indirect effects of thinning on the phytosanitary condition of aspen by promotion of tree growth were investigated. Two thinning methods, manual (thinning from below) and mechanical thinning (schematic), were applied to young stands dominated by Eurasian aspen to study their effects on tree growth and health. All trees were measured at breast height and diameter frequency distribution was determined twice, i.e. three and 24 years after the beginning of the experiment. In addition, during the second measurement, tree-ring samples were obtained from individual trees to evaluate growth and wood decay damage. Neither manual nor mechanical thinning of aspen significantly increased its growth at the stand level, but positive effects on individual trees were observed in plots where mechanical thinning was applied. The thicker the trees, the less decayed they were. The analysis suggests that thinning in general should not be used to increase stand production, but the positive effects of mechanical thinning on individual aspens can be recommended to promote the growth of individual vigorous trees. Keywords: clear-cutting, core rot, mechanical thinning, Populus tremula (L.), thinning from below, tree-ring analysis Journal: Journal of Forest Science Pages: 525-538 Volume: 69 Issue: 12 Year: 2023 DOI: 10.17221/103/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/103/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202312-0003.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:12:id:103-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Jakub Hejtmánek Author-Workplace-Name: Department of Genetics and Physiology of Forest Trees, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jan Stejskal Author-Workplace-Name: Department of Genetics and Physiology of Forest Trees, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Daniel Provazník Author-Workplace-Name: Department of Genetics and Physiology of Forest Trees, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jaroslav Čepl Author-Workplace-Name: Department of Genetics and Physiology of Forest Trees, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Understanding the role of ecotypic factors in the early growth of Pinus sylvestris L. Abstract: The ecological significance of Scots pine (Pinus sylvestris L.) in Europe, especially in areas devastated by bark beetles, has led to its consideration as a substitute for Norway spruce. This pioneering species boasts sun and drought tolerance, fast growth, and wood industry value. To gauge its potential, we examined two ecotypes across two test sites over two years, focusing on height and growth increment. Through statistical analysis employing R software and linear mixed models, we assessed heritability, genotype by environment interaction, and spatial correlations. Both ecotypes exhibited significant differences in height and increment, varying by year and site. Heritability was higher in the second year, with increment showing greater stability. Genetic correlations between sites were evident, suggesting stable increment ranking across locations. These findings underscore the role of ecotypic variation in Scots pine growth, advocating for its consideration in reforestation. Acknowledging such dynamics is vital for effective forest management and reforestation in Central Europe, promoting sustainability and informed decision-making. Further research will enhance this understanding of preserving and enhancing the region's tree populations. Keywords: early selection, ecotypic variation,  genetic correlations, heritability, Scots pine Journal: Journal of Forest Science Pages: 539-549 Volume: 69 Issue: 12 Year: 2023 DOI: 10.17221/102/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/102/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202312-0004.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:12:id:102-2023-JFS