Journal of Forest Science, 2020 (vol. 66), issue 5
Preliminary assessment of effect of disturbance on natural regeneration in gaps of different sizesReview
Maame Esi Hammond, Radek Pokorný
J. For. Sci., 2020, 66(5):185-196 | DOI: 10.17221/25/2020-JFS 
The study focused on natural regeneration of European beech (Fagus sylvatica), Norway spruce (Picea abies) and European larch (Larix decidua) within very small and four times bigger size gaps following a disturbance at a mixed temperate forest in the Czech Republic. In spring 2013, experimental gap design starts, when 1 m2 circular sampling plots along transects were delineated within four selected naturally occurring canopy openings with size below 20 m2. In December 2013, these initial canopy openings were artificially enlarged by felling to 226 m2 for small and 904 m2 for big gaps. Regeneration was monitored in the next two consecutive growing seasons...
Production potential and structural variability of pine stands in the Czech Republic: Scots pine (Pinus sylvestris L.) vs. introduced pines - case study and problem reviewOriginal Paper
Vilém Podrázský, Zdeněk Vacek, Stanislav Vacek, Jan Vítámvás, Josef Gallo, Anna Prokůpková, Giuseppe D'Andrea
J. For. Sci., 2020, 66(5):197-207 | DOI: 10.17221/42/2020-JFS
Scots pine (Pinus sylvestris L.) is one of the most important tree species in Eurasia. During the past centuries, it has been extensively introduced into artificial monocultures, but is currently experiencing a number of problems related to climate change and extreme droughts. There is a large-scale disintegration of its stands and, in addition to its replacement by other native trees, it is possible to use a wide range of introduced species of the same genus. The aim of the investigation was to compare production parameters, structure and diversity of pine stands at the age of 35 years in school Arboretum of Faculty of Forestry and Wood Science in...
Effect of chemical modification on dimensional stability of Pinus radiata D. Don using acetic anhydrideOriginal Paper
Sanjeet Kumar Hom, Sauradipta Ganguly, Yasir Ullah Bhoru, Ajmal Samani
J. For. Sci., 2020, 66(5):208-217 | DOI: 10.17221/13/2020-JFS
Chemical modification is used to efficiently improve some properties of wood to make it suitable for specific end uses. Modification using acetic anhydride (AA) is found suitable to make the wood more stable dimensionally. Pinus radiata wood samples treated with pyridine catalyzed AA were exposed to four different treatment methods comprising vacuum dipping and full cell method (cured with and without chemical). Physical properties like weight percentage gain (WPG), bulking coefficient, swelling coefficient (S) due to the chemical, water absorption and anti-swelling efficiency (ASE) were assessed for a comparative analysis. Results indicated a significant...
Effects of molasses, polyacrylamide and bentonite on dust control in forest roadsOriginal Paper
Aidin Parsakhoo, Seyed Ataollah Hosseini, Majid Lotfalian, Jahangir Mohammadi, Meysam Salarijazi
J. For. Sci., 2020, 66(5):218-225 | DOI: 10.17221/41/2020-JFS
In this study, some environmentally friendly anti-dust agents including sugar cane molasses, polyacrylamide and bentonite were used to control dust emission from the forest road surface within the 3, 9, 27 and 81-day timeframe. A rear-mounted spray system and dust collector devices were used for implementation of treatments and dust emission recording, respectively. The results showed that emitted dust tended to decrease with the increase of anti-dust agent concentrations. Moreover, the emitted dust started to decrease with time, with minimum reduction efficiency at the end of the 81st day. More than half of road surface aggregates had the size smaller...