Template-Type: ReDIF-Article 1.0 Author-Name: M. Nikooy Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, The University of Guilan, Somehsara, Iran Author-Name: A. Esmailnezhad Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, The University of Guilan, Somehsara, Iran Author-Name: R. Naghdi Author-Workplace-Name: Department of Forestry, Faculty of Natural Resources, The University of Guilan, Somehsara, Iran Title: Productivity and cost analysis of skidding with Timberjack 450C in forest plantations in Shafaroud watershed, Iran Abstract: We present research results of timber skidding by a Timberjack 450C skidder in the path cutting of pine trees in Shafaroud watershed. Time studies were conducted to quantify the productivity and perational cost of skidding by a skidder in a plantation in even terrain conditions in Shafaroud, northern Iran. A linear regression model was applied for finding the relation of dependent variables such as total time consumption and productivity with appropriate independent variables. The most influencing variable for skidding were skidding distance, number of logs in each turn and load volume. The results indicated that the total production with and without delays was 5.17 and 5.98 m3.effective h-1, while the production cost with and without delays was 13.7 and 11.91 USD.h-1, respectively. Keywords: forest operation, wood extraction, skidder, time study, Iran Journal: Journal of Forest Science Pages: 261-266 Volume: 59 Issue: 7 Year: 2013 DOI: 10.17221/19/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/19/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201307-0001.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:7:id:19-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: I. Czupy Author-Workplace-Name: Institute of Forest and Environmental Techniques, University of West Hungary, Sopron, Hungary Author-Name: E. Horváth-Szováti Author-Workplace-Name: Institute of Mathematics, University of West Hungary, Sopron, Hungary Title: Vertical force requirement for stump lifting Abstract: In harvest areas the soil preparation is occasionally necessary before reforestation including the removal, collection and transportation of stumps from the soil. Issues related to climate change and the shortage of fossil energy sources call for an increased rate of renewable energy sources. Using the stumps removed from the soil as fuel is a significant resource for biomass. For lifting a stump together with its roots a grab mounted on a shovel is generally used. To rationalise this operation, analyses of stump lifting time have been carried out. We tested a machine mounting one grab for stump lifting on three tree types (Scots pine, robinia and poplar) and found functions correlating stump extraction force and stump diameter, which can be used in order to choose the right machine and determine the cost of the operation. Keywords: bio-energy, stump diameter, stump extraction force, stump extraction machines, stump lifting Journal: Journal of Forest Science Pages: 267-271 Volume: 59 Issue: 7 Year: 2013 DOI: 10.17221/4/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/4/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201307-0002.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:7:id:4-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: V. Gholami Author-Workplace-Name: Department of Range and Watershed Management, Faculty of Natural Resources, University of Guilan, Somehsara, Iran Title: The influence of deforestation on runoff generation and soil erosion (Case study: Kasilian Watershed) Abstract: Destroying of forest lands and landuse changes have caused undesirable effects in the watershed hydrologic conditions. Landuse and vegetation are important factors in soil erosion and runoff generation. This research has been done using a runoff-rainfall model, sediment-erosion model, Geographical Information System and remote sensing to determine the hydrologic effects of deforestation on Kasilian watershed (north of Iran). A runoff-rainfall model has been presented using GIS (HEC-GeoHMS extension) and hydrologic model (HEC-HMS). The SCS method has been used for presenting the hydrologic model. It is to note that the optimized model is evaluated by other six events of floods. Then, the optimized model has been validated. Erosion potential method model has been applied in GIS environment to simulate soil erosion and sediment rate. According to the obtained results, the runoff and sediment generation potential have been increased in the Kasilian watershed due to deforestation during the last forty years. Keywords: forest, landuse, runoff-rainfall model, sediment, Iran Journal: Journal of Forest Science Pages: 272-278 Volume: 59 Issue: 7 Year: 2013 DOI: 10.17221/20/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/20/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201307-0003.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:7:id:20-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: M.R. Ullah Author-Workplace-Name: College of Forestry, Beijing Forestry University, China Author-Name: X.D. Liu Author-Workplace-Name: College of Forestry, Beijing Forestry University, China Author-Name: M. Al-Amin Author-Workplace-Name: Institute of Forestry and Environmental Sciences, University of Chittagong, Bangladesh Title: Spatial-temporal distribution of forest fires and fire weather index calculation from 2000 to 2009 in China Abstract: This paper describes the forest fire dynamics in the city of Sanming in Fujian province, China, from 2000 to 2009 with a view to understand the number of fires and burned areas in different counties. It also includes the spatial-temporal distribution of fires and application of the Canadian Forest Fire Danger Rating System (CFFDRS). Daily forest fire data was provided by the Department of Wildfire Prevention of Sanming Forestry Bureau. FWI calculator v.7.0.2.76 was used in this study for analysing the weather parameter data. The results showed that a total of 818 fires and burned areas of 8721.16 ha were found during the study period of 10 years. However, the highest and lowest forest fires were found in Youxi county and Sanming district, respectively. Most of the fires with large burned areas occurred at 2 p.m. Moreover, occurrences of fires were found the highest and lowest in March and June, respectively. Based on FWI calculation, the highest danger rating value was found in March, 2009. This study proposes that it would be possible to manage regular forest fire occurrences through the application of CFFDRS. Finally, to plan the fire prevention and management in southern China and other tropical countries, this system has a great opportunity for further implementations. Keywords: Sanming, spatial-temporal distribution, CFFDRS Journal: Journal of Forest Science Pages: 279-287 Volume: 59 Issue: 7 Year: 2013 DOI: 10.17221/8/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/8/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201307-0004.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:7:id:8-2013-JFS Template-Type: ReDIF-Article 1.0 Author-Name: J. Malá Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Author-Name: M. Cvikrová Author-Workplace-Name: Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Prague, Czech Republic Author-Name: M. Hrubcová Author-Workplace-Name: Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Prague, Czech Republic Author-Name: P. Máchová Author-Workplace-Name: Forestry and Game Management Research Institute, Jíloviště-Strnady, Czech Republic Title: Influence of vegetation on phenolic acid contents in soil Abstract: The study described in this paper was undertaken in order to assess the impact of different woody plants on the dynamics of phenolic acids in soil. The influence of plant litter on the amount of phenolic compounds occurring in soils beneath several deciduous and coniferous tree species was examined in pot experiments. The contents of endogenous methanol soluble free and conjugated phenolic acids in Norway spruce, larch, rowan and two species of willow were determined. We focused on the dynamics of water-soluble and reversibly bound phenolic acid contents in the upper layers of soil substrates in pots after the cultivation of studied woody plants. Keywords: Norway spruce, larch, rowan, willow, phenolic compounds, pot experiment Journal: Journal of Forest Science Pages: 288-294 Volume: 59 Issue: 7 Year: 2013 DOI: 10.17221/23/2013-JFS File-URL: http://jfs.agriculturejournals.cz/doi/10.17221/23/2013-JFS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/jfs-201307-0005.txt Handle: RePEc:caa:jnljfs:v:59:y:2013:i:7:id:23-2013-JFS