Template-Type: ReDIF-Article 1.0 Author-Name: Prabina Sharma Author-Workplace-Name: Department of Forestry and Environmental Conservation, Clemson University, Clemson, USA Author-Name: David R. Coyle Author-Workplace-Name: Department of Forestry and Environmental Conservation, Clemson University, Clemson, USA Author-Name: James F. Palmer Author-Workplace-Name: Department of Forestry and Environmental Conservation, Clemson University, Clemson, USA Author-Name: Nilesh Timilsina Author-Workplace-Name: Department of Forestry and Environmental Conservation, Clemson University, Clemson, USA Author-Name: Jessica Hartshorn Author-Workplace-Name: Agricultural Research Development Program, Central State University, Wilberforce, USA Title: Morpho‑physiological traits and biomass scaling of the invasive Callery pear (Pyrus calleryana Decne.) Abstract: Accurately estimating aboveground biomass (AGB) of invasive plant species is essential for understanding their prevalence, ecological impacts, and informed management strategies. Pyrus calleryana (Callery pear) is established throughout the eastern United States, yet species-specific biomass models and physiological trait data remain limited. We destructively sampled 40 single-stem trees with diameter at breast height (DBH) ranging from 1.2 cm to 17.7 cm and height from 1.6 m to 10.3 m across six sites in South Carolina to quantify dry biomass, moisture content (MC), Carbon and Nitrogen ratios (C : N), and to develop allometric equations for predicting total AGB. The DBH-based log-linear model provided the strongest overall fit for total AGB (R2 = 0.91; bias = 0.41 kg), and hold-out validation indicated strong predictive performance for unobserved trees (root mean square error, i.e. RMSE = 5.59 kg; validation R2 = 0.967). Tissue traits differed significantly: leaves had the highest moisture content, whereas stems had the highest C : N ratio and AGB. These findings provide a practical, biologically interpretable DBH-based equation and biomass data suitable for forest inventory applications and invasion monitoring. The study also establishes baseline physiological parameters for P. calleryana, supporting improved evaluation of its ecological footprint and management needs. Keywords: allometric modelling, Bradford pear, carbon, moisture content, South Carolina Journal: Journal of Forest Science Pages: 441-454 Volume: 72 Issue: 9 Year: 2026 DOI: 10.17221/49/2026-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/49/2026-JFS.html File-Format: text/html File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/49/2026-JFS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202609-0001.txt Handle: RePEc:caa:jnljfs:v:72:y:2026:i:9:id:49-2026-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Adenan Yandra Nofrizal Author-Workplace-Name: Department of Applied Geoinformatics and Cartography, Faculty of Science, Charles University in Prague, Prague, Czech Republic Author-Name: Lucie Červená Author-Workplace-Name: Department of Applied Geoinformatics and Cartography, Faculty of Science, Charles University in Prague, Prague, Czech Republic Author-Name: Jakub Lysák Author-Workplace-Name: Department of Applied Geoinformatics and Cartography, Faculty of Science, Charles University in Prague, Prague, Czech Republic Author-Name: Zuzana Lhotáková Author-Workplace-Name: Department of Experimental Plant Biology, Faculty of Science, Charles University in Prague, Prague, Czech Republic Author-Name: Kristýna Štěpánová Author-Workplace-Name: Department of Experimental Plant Biology, Faculty of Science, Charles University in Prague, Prague, Czech Republic Author-Name: Jana Albrechtová Author-Workplace-Name: Department of Experimental Plant Biology, Faculty of Science, Charles University in Prague, Prague, Czech Republic Author-Name: Lucie Kupková Author-Workplace-Name: Department of Applied Geoinformatics and Cartography, Faculty of Science, Charles University in Prague, Prague, Czech Republic Title: Cross-scale assessment of pigment differences between healthy and bark-beetle-damaged Norway spruce stands using UAV and airborne hyperspectral imagery Abstract: Chlorophyll and carotenoid content provide information on forest canopy condition and may reveal biochemical differences associated with disturbance. However, it remains uncertain whether these differences can be consistently detected from hyperspectral observations acquired at different spatial scales. We assessed pigment differences between two contrasting Norway spruce [Picea abies (L.) Karst.] reference stands: one without visible crown damage and one disturbed following bark beetle infestation in Krkonoše National Park, Czechia. The study combined 54 biochemical needle samples from 18 trees and simultaneous UAV Headwall Nano-Hyperspec® and airborne CASI-1500 imagery. A hybrid framework based on PROSAIL simulations and Random Forest regression was used to retrieve chlorophyll and carotenoid content. After averaging the three within-tree image-derived estimates to obtain one crown-level value per tree, linear models based on 18 independent crown-level observations showed higher retrieved chlorophyll and carotenoid content at Tetřeví Boudy (healthy) than at Rejdiště (infested). UAV retrieval achieved R2 = 0.96 and RMSE (root mean square error) = 2.64 µg.cm-2 for chlorophyll and R2 = 0.80 and RMSE = 0.9 µg.cm-2 for carotenoids. Airborne retrievals reached R2 = 0.93 and RMSE = 3.76 µg.cm-2 for chlorophyll and R2 = 0.76 and RMSE = 0.95 µg.cm-2 for carotenoids. Chlorophyll showed stronger cross-scale correlation than carotenoids (r = 0.98 and 0.89, respectively), while the main spatial patterns and differences between stands were preserved at both scales. The results provide proof of concept that physiologically meaningful pigment differences between contrasting Norway spruce stands can be captured using UAV and airborne hyperspectral data. Because only two stands and one acquisition date were analysed, although the single-stand-per-condition design precludes attribution of the contrast to bark beetle damage, and broader validation across stands, disturbance stages and seasons is required. Keywords: carotenoids, chlorophyll, forest health, imaging spectroscopy, PROSAIL Journal: Journal of Forest Science Pages: 483-499 Volume: 72 Issue: 9 Year: 2026 DOI: 10.17221/61/2026-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/61/2026-JFS.html File-Format: text/html File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/61/2026-JFS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202609-0002.txt Handle: RePEc:caa:jnljfs:v:72:y:2026:i:9:id:61-2026-JFS Template-Type: ReDIF-Article 1.0 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: Jan Cukor Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Name: Veronika Hammerová Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jakub Černý Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Workplace-Name: Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, 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: Richard Ševčík Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Name: Kateřina Brynychová Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Name: Václav Trojan Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: Jan Budínský Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Simulated bark stripping reduces stem growth in young Norway spruce: Evidence from continuous dendrometer monitoring Abstract: Norway spruce [Picea abies (L.) Karst.] is Europe's most important commercial tree species, whose stability, vitality, and production potential can be significantly compromised by cervids. Their populations in Europe have been growing over time. This study aimed to analyse the effect of simulated circumferential trunk damage - mimicking bark stripping by ungulates - on the diameter growth of young spruce trees through continuous measurements with point dendrometers at 15-minute intervals. Dendrometers were installed at two permanent research plots (PRPs) in the Lužické hory (Lusatian Mountains) and at another two PRPs in the Krušné hory (Ore Mountains) on spruce stands aged 16-21 years. At each PRP, 15 co-dominant trees were monitored; five served as undamaged control trees, while ten were experimentally damaged by removing bark over an area ranging from 5-90% of the trunk circumference. The most intense diameter growth occurred during an approximately 14-day period at the turn of May and June. The growth activity ceased on all PRPs during the second to third week of September. Even during the first growing season after the experimental damage, significantly lower diameter growth was observed in the evaluated trees when compared with undamaged control trees (P < 0.05). On PRP 2, undamaged trees achieved up to 87.8% higher growth than the damaged ones. Overall, the diameter growth of damaged trees was 37.9-43.2% lower than that of undamaged control ones, depending on the damage category, although no significant differences were found among the damage categories of 5-30%, 40-60%, and 70-90%, respectively. The results show that simulated bark damage can considerably reduce the diameter growth of young spruce trees as early as the first growing season, underscoring the importance of effective stand protection from harm caused by ungulates. Keywords: climate change, game damage, Krušné hory, Lužické hory, Picea abies (L.) Karst., red deer Journal: Journal of Forest Science Pages: 455-468 Volume: 72 Issue: 9 Year: 2026 DOI: 10.17221/71/2026-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/71/2026-JFS.html File-Format: text/html File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/71/2026-JFS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202609-0003.txt Handle: RePEc:caa:jnljfs:v:72:y:2026:i:9:id:71-2026-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Petra Hlaváčková Author-Workplace-Name: Department of Forest and Wood Products Economics and Policy, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Author-Name: Martin Cempírek Author-Workplace-Name: Department of Forest and Wood Products Economics and Policy, Faculty of Forestry and Wood Technology, Mendel University in Brno, Brno, Czech Republic Title: EU Deforestation Regulation, timber theft and illegal logging in Czech judicial practice Abstract: This study evaluates the potential of the European Union Deforestation Regulation (EUDR) to reduce timber theft and illegal logging through an analysis of Czech judicial practice. A qualitative content analysis of publicly available court decisions concerning illegal harvesting, timber theft and related forms of forest crime was conducted. The identified crime mechanisms were subsequently assessed against EUDR requirements concerning geolocation, due diligence, risk assessment and supply-chain traceability. The results show that illegal harvesting is a multi-stage process involving the selection of vulnerable forest properties, creation of apparent legality, timber harvesting, concealment of origin and subsequent commercialisation. Economic gain was not derived from the physical acquisition of timber itself but from its successful integration into formal market channels. The identified mechanisms closely resemble processes commonly described as timber laundering. The analysis suggests that EUDR may increase barriers to the legalisation and commercialisation of illegally obtained timber through geolocation requirements, enhanced documentation and due diligence obligations. However, the regulation does not directly address vulnerabilities enabling unauthorised harvesting itself, such as limited owner supervision and information asymmetries. The findings indicate that the principal contribution of EUDR lies in increasing supply-chain transparency and reducing opportunities for the economic utilisation of illegally obtained timber. Keywords: commodity provenance, document fraud, environmental criminology, forest governance, ownership vulnerability, regulatory compliance Journal: Journal of Forest Science Pages: 469-482 Volume: 72 Issue: 9 Year: 2026 DOI: 10.17221/67/2026-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/67/2026-JFS.html File-Format: text/html File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/67/2026-JFS.pdf File-Format: Application/pdf X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202609-0004.txt Handle: RePEc:caa:jnljfs:v:72:y:2026:i:9:id:67-2026-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Yedil Aishuk Author-Workplace-Name: Saken Seifullin Kazakh Agrotechnical Research University, Astana, Republic of Kazakhstan Author-Workplace-Name: Shokan Ualikhanov Kokshetau University, Kokshetau, Republic of Kazakhstan Author-Name: Dani Sarsekova Author-Workplace-Name: Kazakh National Agrarian Research University, Almaty, Republic of Kazakhstan Title: Corrigendum: Microclonal propagation of Cotoneaster melanocarpus as a tool for ecosystem restoration and resilience in Kazakhstan Abstract: Corrigendum Journal: Journal of Forest Science Pages: 500 Volume: 72 Issue: 9 Year: 2026 DOI: 10.17221/79/2026-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/79/2026-JFS.html File-Format: text/html File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/79/2026-JFS.pdf File-Format: Application/pdf Handle: RePEc:caa:jnljfs:v:72:y:2026:i:9:id:79-2026-JFS