Environmentally Sound Harvesting Technologies in Commercial Forests in the Area of Northern Velebit – Functional Terrain Classification

Background and Purpose: The role of environmental effects in timber harvesting has great importance in decision making and planning logging operations. Consequently, more emphasis should be put on a planning system so that environmentally sensitive sites for a certain harvesting system can be recognized and the most suitablemachinery selected for given terrain conditions. Material and Methods: Four main data sources have been used for the model of ecoefficient harvesting system prediction: 1) a digital elevation model (DEM), 2) a digital network of forest roads, 3) forest inventory data and 4) ecoefficient limitations for harvesting systems. Software ArcGIS 9 was used for GIS processing and data analysis. Results: Amodel for selecting an ecoefficient harvesting system for commercial forests of Northern Velebit is based on three influencing factors: terrain slope, extraction distance and breast height diameter of trees. Based on the model, a harvesting system is determined for each forest subcompartment. The results show that breast height tree diameter restricts mechanized felling and processing. Fully mechanized harvesting systems could be used only over 7.27% of the researched area. Ground based extraction represents the main technology. Conclusions: In order to establish functional terrain classification, a model for determining an ecoefficient harvesting system should comprise a geographic information system, and terrain and forest stand data. Specific terrain (limestone combined with relief characteristics) and forest stand conditions (mixed selective forests with natural regeneration) limit the application of some harvesting systems which would otherwise be environmentally acceptable in many other cases.

[1]  W. D. Ostrofsky,et al.  Residual tree damage estimates from partial cutting simulation , 1994 .

[2]  Hans Rudolf Heinimann,et al.  Perspectives on Central European Cable Yarding Systems , 2001 .

[3]  Karl Stampfer,et al.  Analyses of Parameters Affecting Helicopter Timber Extraction , 2002 .

[4]  Dubravko Horvat,et al.  Morphological characteristics and productivity of skidder ECOTRAC 120V , 2007 .

[5]  T. W. Reisinger,et al.  Evaluating Terrain for Harvesting Equipment Selection , 1990 .

[6]  D. Athanassiadis.  Residual stand damage following cut-to-length harvesting operations with a farm tractor in two conifer stands. , 1997 .

[7]  Valéria Messingerová,et al.  Technological and Environmental Parameters of Helicopter Timber Extraction in Slovakia , 2006 .

[8]  C. Nugent,et al.  Characteristic site disturbance due to harvesting and extraction machinery traffic on sensitive forest sites with peat soils , 2003 .

[9]  Matti Sirén.  Tree Damage in Single-Grip Harvester Thinning Operations , 2001 .

[10]  Gianluca Gallerano.  Quality of Life and Management of Living Resources , 2004 .

[11]  Tomislav Poršinsky,et al.  Environmental Evaluation of Timberjack 1710B Forwarder on Roundwood Extraction from Croatian Lowland Forests , 2006 .

[12]  H. R. Heinimann,et al.  Forest operations under mountainous conditions. , 2000 .

[13]  Pete Bettinger,et al.  Residual stand damage from cut-to-length thinning of second-growth timber in the Cascade range of western Oregon. , 1993 .

[14]  Tomislav Poršinsky,et al.  Efficiency of Timberjack 1710B Forwarder on Roundwood Extraction from Croatian Lowland Forests , 2006 .

[15]  M. Šušnjar,et al.  Soil compaction in timber skidding in winter conditions , 2006 .

[16]  FALLING EQUIPMENT,et al.  Harvesting Systems and Equipment in British Columbia , 1999 .

[17]  Tomislav Poršinsky,et al.  Contribution to Investigation of Tree Damaging by Forest Road Excavating Machines , 2003 .

[18]  Karl Stampfer,et al.  A New Approach To Derive A Productivity Model for the Harvester "Valmet 911 Snake" , 2001 .

[19]  Barbara Limbeck-Lilienau,et al.  RESIDUAL STAND DAMAGE CAUSED BY MECHANIZED HARVESTING SYSTEMS , 2003 .

[20]  R. Heinrich,et al.  Fao Model Code of Forest Harvesting Practice , 1996 .

[21]  Loren D. Kellogg,et al.  Damage characteristics in young Douglas-fir stands from commercial thinning with four timber harvesting systems. , 2000 .

[22]  Hans Rudolf Heinimann,et al.  Forest operations engineering and management – the ways behind and ahead of a scientific discipline , 2007 .

[23]  Anton Sabo.  Skidding of fir roundwood by Timberjack 240C from selective forests of Gorski Kotar , 2005 .