Template-Type: ReDIF-Article 1.0 Author-Name: Karel Vančura Author-Workplace-Name: Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Prague, Czech Republic Author-Name: Anna Prokůpková Author-Workplace-Name: Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Prague, Czech Republic Author-Name: Daniel Bulušek Author-Workplace-Name: Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Prague, Czech Republic Author-Name: Václav Šimůnek Author-Workplace-Name: Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Prague, Czech Republic Author-Name: Vojtěch Hájek Author-Workplace-Name: Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Prague, Czech Republic Author-Name: Ivo Králíček Author-Workplace-Name: University of Hradec Králové, Faculty of Science, Hradec Králové, Czech Republic Title: Dynamics of mixed lowland forests in Central Bohemia over a 20-year period Abstract: The paper deals with the effect of environmental factors and management on various mixed lowland forests in the Medník National Natural Monument, Czech Republic, over a 20-year period. The objectives were to evaluate the structure, production, dynamics and radial growth in relation to climatic conditions in the mixed hornbeam-oak, herb-rich beech and spruce forest stands. The tree density decreased by 8.5% (to 120-1,364 trees.ha-1), while stand volume increased by 28.0% (to 244-767 m3.ha-1) from 1998 to 2018. Large-leaved lime (Tilia platyphyllos Scop.) and Norway spruce (Picea abies /L./ Karst.) showed high variability and sensitivity to climatic factors in radial growth compared to stability and resistance in sessile oak (Quercus petraea /Matt./ Liebl.) and European beech (Fagus sylvatica L.). April, June and July were determined as the most significant months in relation to diameter increment. The synergism of precipitation deficit and high air temperature was a limiting factor of growth in the studied lowland area. The frequency of negative pointer years with extremely low radial growth has been increasing recently. Generally, hornbeam-oak stands are characterized by rich structure, high density and lower productivity, herb-rich beech stands represent rich structured productive forests and spruce forests are very productive stands but with low ecological stability. Keywords: protected area, stand structure, tree-ring dating, climate change, Czech Republic Journal: Journal of Forest Science Pages: 49-62 Volume: 66 Issue: 2 Year: 2020 DOI: 10.17221/6/2020-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/6/2020-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202002-0001.txt Handle: RePEc:caa:jnljfs:v:66:y:2020:i:2:id:6-2020-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Mariusz Kormanek Author-Workplace-Name: Department of Forest Work Mechanization, Institute of Forest Utilization and Forest Technology, Faculty of Forestry, University of Agriculture in Krakow, Krakow, Poland Title: Analysis of wood chipping capacity of the Bandit 990XP chipper - case study Abstract: According to the data of the Central Statistical Office, there has been an increase in forest cover in Poland from 27.8% to 29.6% over the last 25 years. This increase contributed to an increase in the possibility of wood obtaining and processing for energy purposes. The aim of the study was to analyse the efficiency of a chipping machine manufactured by the American Company Bandit Industries (Bandit 990XP chipper) based on the working day chronometer. The study was carried out in specific conditions related to the place of the chipper application because the machine was used to process the material obtained from standing trees in the framework of park maintenance. As it was shown during the analysed working day, the effective capacity W1 in the work cycle of the Bandit 990XP machine was 9.2 m3∙h-1 chips. Specific working conditions made it impossible to organize the work smoothly. Ongoing obtaining of the material for chipping from standing trees resulted in low productivity during the exploitation time of the shift W08 on the level of 1.3 m3∙h-1 chips. Keywords: chipper, wood chips, efficiency, dendromass Journal: Journal of Forest Science Pages: 63-69 Volume: 66 Issue: 2 Year: 2020 DOI: 10.17221/146/2019-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/146/2019-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202002-0002.txt Handle: RePEc:caa:jnljfs:v:66:y:2020:i:2:id:146-2019-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Mohadeseh Ghanbari Motlagh Author-Workplace-Name: Department of Forestry, Faculty of Natural resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Author-Name: Sasan Babaie Kafaky Author-Workplace-Name: Department of Forestry, Faculty of Natural resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Author-Name: Asadollah Mataji Author-Workplace-Name: Department of Forestry, Faculty of Natural resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran Author-Name: Reza Akhavan Author-Workplace-Name: Research Institute of Forests and Ranglands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iran Author-Name: Behzad Amraei Author-Workplace-Name: Department of Biology, Payame Noor University, Tehran, Iran Title: An introduction to the distribution of carbon stocks in temperate broadleaf forests of northern Iran Abstract: Northern forests of Iran are among the most important plant communities in Iran due to their dynamic and diverse vegetation composition and fertile soils. There is little information about carbon stocks of these forests. In the present study, above- and belowground carbon stocks of trees, litter, herbs and soil organic carbon stock at three selected sites of these forests were calculated using random plots and non-destructive sampling. The FAO method was used for carbon estimation of trees and Walkley-Black method was used for soil carbon stock and carbon coefficient was estimated directly. The results showed that both the tree carbon stocks and soil carbon stocks increased from east to west with increasing altitude, showing significant differences. The results also indicate that these forests have a high carbon sequestration potential as a green belt across the northern slopes of the Alborz Mountains, when the contribution of the aboveground section was greater than that of the belowground section (soil and roots) at all sites. Keywords: carbon, temperate forests, soil carbon, litter, herb, trees Journal: Journal of Forest Science Pages: 70-79 Volume: 66 Issue: 2 Year: 2020 DOI: 10.17221/149/2019-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/149/2019-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202002-0003.txt Handle: RePEc:caa:jnljfs:v:66:y:2020:i:2:id:149-2019-JFS Template-Type: ReDIF-Article 1.0 Author-Name: Muhammad Javed Asif Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Author-Workplace-Name: Center for Advanced Studies in Agriculture and Food Security, University of Agriculture, Faisalabad, Pakistan Author-Name: Atif Ali Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Author-Name: Muhammad Zaid Mazhar Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Author-Name: Ayyoub Tanvir Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Author-Name: Bilal Zia Author-Workplace-Name: Pakistan Forest Institute, Peshawar, Khyber Pakhtunkhwa, Pakistan Author-Name: Iqra Anmbreen Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Author-Name: Muhammad Zohaib Anjum Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Author-Name: Muhammad Shabir Mahr Author-Workplace-Name: Department of Forestry and Range Management, University of Agriculture, Faisalabad, Pakistan Title: Effect of different pre-treatments on seed germination of Prosopis juliflora and Dalbergia sissoo: a step towards mutation breeding Abstract: For improving the seed germination of Prosopis juliflora and Dalbergia sissoo different treatments were tested, including side cutting, abrasion, overnight soaking in boiling water, scalding in actively boiling water for 1 minute and immersion in 30%, 60% and 95% H2SO4 solution. Results showed that abrasion with sandpaper and side cutting were the most effective methods to break seed dormancy in both species, while scalding in actively boiling water for 1 minute, overnight soaking and different concentrations of H2SO4 gave low to zero seed germination. Based on the positive effects of scarification it was concluded that seed dormancy in both species was due to water impermeability of the seed coat. Mutation breeding involves the treatment of large quantities of seeds, therefore abrasion with sandpaper was the most efficient and less labour-intensive method; this method was subsequently used for determination of LD50 as it is a prerequisite in a mutation breeding program. Abrasion before irradiation had a positive effect on P. juliflora whereas it had a negative effect on D. sissoo seeds. Seeds of both species were exposed to different doses of gamma rays such as 0, 100, 200, 300, 400 and 500 Gy using a 60Co source. The LD50 for P. juliflora was 651 Gy based on the rate of seed germination indicating that P. juliflora had tolerance to irradiation and low radiosensitivity to gamma ray. A high LD50 of 1097 Gy was observed for D. sissoo, suggesting high tolerance to irradiation and very low radio sensitivity. These findings will help to initiate a mutation breeding program in both species to obtain desirable mutants with desirable characteristics such as thornless genotypes, better tree form, disease resistance and increased genetic diversity. Keywords: seed dormancy, gamma rays, genetic diversity, phenotypic variation Journal: Journal of Forest Science Pages: 80-87 Volume: 66 Issue: 2 Year: 2020 DOI: 10.17221/64/2019-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/64/2019-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-202002-0004.txt Handle: RePEc:caa:jnljfs:v:66:y:2020:i:2:id:64-2019-JFS