Journal of Forest Science, 2013 (vol. 59), issue 7

Productivity and cost analysis of skidding with Timberjack 450C in forest plantations in Shafaroud watershed, IranOriginal Paper

M. Nikooy, A. Esmailnezhad, R. Naghdi

J. For. Sci., 2013, 59(7):261-266 | DOI: 10.17221/19/2013-JFS  

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...

Vertical force requirement for stump liftingOriginal Paper

I. Czupy, E. Horváth-Szováti

J. For. Sci., 2013, 59(7):267-271 | DOI: 10.17221/4/2013-JFS  

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...

The influence of deforestation on runoff generation and soil erosion (Case study: Kasilian Watershed)Original Paper

V. Gholami

J. For. Sci., 2013, 59(7):272-278 | DOI: 10.17221/20/2013-JFS  

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...

Spatial-temporal distribution of forest fires and fire weather index calculation from 2000 to 2009 in ChinaOriginal Paper

M.R. Ullah, X.D. Liu, M. Al-Amin

J. For. Sci., 2013, 59(7):279-287 | DOI: 10.17221/8/2013-JFS  

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,...

Influence of vegetation on phenolic acid contents in soilOriginal Paper

J. Malá, M. Cvikrová, M. Hrubcová, P. Máchová

J. For. Sci., 2013, 59(7):288-294 | DOI: 10.17221/23/2013-JFS  

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.