Template-Type: ReDIF-Article 1.0 Author-Name: Elena Rosales-Islas Author-Workplace-Name: Laboratory of Genetics, Biological Research Center, Autonomous University of Hidalgo State, Hidalgo, Mexico Author-Name: Pablo Octavio-Aguilar Author-Workplace-Name: Laboratory of Genetics, Biological Research Center, Autonomous University of Hidalgo State, Hidalgo, Mexico Title: Effect of forest management on the genetic diversity of Abies hidalgensis, a threatened species with restricted distribution Abstract: Abies hidalgensis is an endemic species from the state of Hidalgo, Mexico, that has been registered only in nine fragmented relict populations that have a total of 1 000 individuals among them. Intensive forest management takes place in five of the populations under specific programs focused on Pinus spp. Still, it is necessary to know the impact of these activities on the genetic diversity of the threatened species, if restoration and conservation strategies are to be proposed. The aim of this work was to estimate the effect of forest management on the genetic structure of A. hidalgensis using seven nuclear molecular markers developed for A. guatemalensis (Ab07, Ab08, Ab09, Ab12, Ab15, Ab20, Ab23). The species was sampled growing under two different conditions; (i) areas under forest management and (ii) conserved areas. Two indexes of genetic diversity were evaluated, observed and expected heterozygosity. The genetic structure was determined by an analysis of molecular variance and a Bayesian assignment model. A bottleneck analysis was also carried out. The populations were found to have a common genetic base (differen­tiation coefficient FST = 0.056, number of mi­grants per generation Nm = 43), which suggests recent fragmentation of the distribution, which in turn increases the bottleneck effect in managed areas (Wilcoxon probability Wp = 0.007 and 0.016). This explains the apparently high heterozygous level (He = 0.69) and low inbreeding. Our results are important as they may be used to design strategies for management and conservation of A. hidalgensis. Keywords: bottleneck, fir, genetic structure, genetic variation, population genetics Journal: Journal of Forest Science Pages: 193-204 Volume: 69 Issue: 5 Year: 2023 DOI: 10.17221/13/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/13/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202305-0001.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:5:id:13-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Ina Zavadilová Author-Name: Justyna Szatniewska Author-Workplace-Name: Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic Author-Name: Marko Stojanović Author-Workplace-Name: Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic Author-Name: Peter Fleischer Author-Workplace-Name: Faculty of Forestry, Technical University in Zvolen, Zvolen, Slovakia. Author-Workplace-Name: Institute of Forest Ecology, Slovak Academy of Sciences, Zvolen, Slovakia Author-Workplace-Name: Administration of Tatra National Park, Tatranska Lomnica, Slovakia Author-Name: Lukáš Vágner Author-Workplace-Name: Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic Author-Name: Marian Pavelka Author-Workplace-Name: Global Change Research Institute, Czech Academy of Sciences, Brno, Czech Republic Author-Name: Peter Petrík Author-Workplace-Name: Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research - Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany Title: The effect of thinning intensity on sap flow and growth of Norway spruce Abstract: Forest thinning can be used as an adaptive measure to improve the growth and resistance of Norway spruce forests affected by climate change. The impact of different thinning intensities on sap flow, growth, and tree water deficit of 40-year-old Norway spruce was tested. High thinning intensity (-61% of basal area) resulted in increased tree-level sap flow compared to the control (+27%), but it caused a decrease in the stand-level transpiration (-34%) due to reduced leaf area index. Low-intensity thinning (-28% basal area), high-intensity thinning, and control showed similar responses of sap flow to vapour pressure deficit and global radiation, suggesting unchanged isohydric behaviour. Both low- and high-intensity treatments displayed greater radial growth than the control. There were no differences in tree water deficit between the treatments. The low-intensity treatment can be considered the best water utilisation treatment with increased growth and unchanged transpiration at the tree level. The high-intensity treatment had similar radial growth as the low-intensity but lower stand-level transpiration, implying improved soil water availability. The study expands the ecophysiological understanding of thinning as a valuable silvicultural practice for adapting forest management of Norway spruce to the effects of climate change. Keywords: increment, Picea abies, silviculture, transpiration, tree water deficit Journal: Journal of Forest Science Pages: 205-216 Volume: 69 Issue: 5 Year: 2023 DOI: 10.17221/17/2023-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/17/2023-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202305-0002.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:5:id:17-2023-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Channa Suraweera 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 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: Giuseppe D'Andrea 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: Jiří Remeš Author-Workplace-Name: Department of Silviculture, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Intensive initial care of silver fir using improving compounds: A way to support diverse forests? Abstract: In some cases, it is difficult to promote climax tree species in the forest stand composition. In the Czech Republic, silver fir (Abies alba Mill.) is a typical example. This study offers an evaluation of the use of two improving compounds for tree plantations in the initial stage of growth in Central Bohemia. In the experiment, we measured the initial growth performance of a young fir plantation treated with a brassinolide compound (concentration 1 : 100 and 1 : 200) and Bio-Algeen® prior to planting and compared it with control treatment: we assessed height, root collar diameter, vitality and mortality rate during the period 2014-2019. Cumulative mortality rate of the plantation reached 25% at the end of the monitoring period, without any significant differences between variants. Height increment of the variant treated with Bio-Algeen® was significantly (P < 0.05) lower than the growth of brassinolide-treated variants, all treated variants were comparable with the control variant. The plantation underwent a drought-stress period in 2014 and 2015, which resulted in worsened vitality and colour across variants. As a result of the simple economic analysis, the most expensive inputs are planting stock and labour, therefore the price and application of additional substances should not affect decision-making. Keywords: Abies alba, brassinolide, Bio-Algeen®, , forest regeneration, silviculture Journal: Journal of Forest Science Pages: 179-192 Volume: 69 Issue: 5 Year: 2023 DOI: 10.17221/178/2022-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/178/2022-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202305-0003.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:5:id:178-2022-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Tahmina Afroz Author-Workplace-Name: Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh Author-Name: Md. Giashuddin Miah Author-Workplace-Name: Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh Author-Name: Hasan Muhammad Abdullah Author-Workplace-Name: Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh Author-Name: Md. Rafiqul Islam Author-Workplace-Name: Department Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh Author-Name: Md. Mizanur Rahman Author-Workplace-Name: Department of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh Title: Estimation of land cover changes and biomass carbon stock in north-eastern hill forests of Bangladesh Abstract: Forests are atmospheric CO2 sinks, but their losses and degradation accelerate the emissions of carbon stored as a sink. Deforestation and forest degradation are widespread in Bangladesh, but their impact on greenhouse gas (GHG) emissions is unknown. We assess land use and land cover (LULC) change and forest loss in this study by classifying different Landsat satellite imagery with a focus on forest cover loss from 1989 to 2020. Tier 1 standards were used to estimate the carbon removal and emissions from a small-scale tropical forest. Over the last three decades, the forest area has decreased by 2.40%, 3.74% and 7.52%, respectively. The primary causes of forest loss are large-scale tea garden and homestead expansion, as well as increase in agricultural activities. Because of a reduction in the forest area, the annual gain of carbon in forest biomass has also decreased. Although overall carbon emission was a net gain for the Maulvibazar hill forest, it has decreased from 331.24 Gg.yr-1 in the first decade (1989 to 2000) to 307.7 Gg.yr-1 in the most recent decade (2011 to 2020), which is an alarming trend. As a result, this research will contribute to leaders' commitment to "halt and reverse forest loss and land degradation by 2030" at the 26th United Nations Climate Change Conference of the Parties (COP 26) in 2021 to improve carbon sequestration, combat climate change and conserve biodiversity. Keywords: carbon storage, emission, land transformation, remote sensing, trees Journal: Journal of Forest Science Pages: 217-227 Volume: 69 Issue: 5 Year: 2023 DOI: 10.17221/111/2022-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/111/2022-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202305-0004.txt Handle: RePEc:caa:jnljfs:v:69:y:2023:i:5:id:111-2022-JFS