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Projects / Programmes source: ARRS

Possibilities and limitations of biomass production from forests

Research activity

Code Science Field Subfield
4.01.01  Biotechnical sciences  Forestry, wood and paper technology  Forest - forestry 

Code Science Field
B430  Biomedical sciences  Sylviculture, forestry, forestry technology 

Code Science Field
4.01  Agricultural and Veterinary Sciences  Agriculture, Forestry and Fisheries 
Keywords
biomass use, green chips, nutrients removal, forest soils damages, whole tree harvesting method, bio
Evaluation (rules)
source: COBISS
Researchers (14)
no. Code Name and surname Research area Role Period No. of publications
1.  34177  Tina Jemec  Forestry, wood and paper technology  Technician  2011 - 2013  188 
2.  21136  Jaka Klun  Forestry, wood and paper technology  Researcher  2011 - 2013  163 
3.  27605  PhD Milan Kobal  Forestry, wood and paper technology  Researcher  2011 - 2013  338 
4.  07127  PhD Hojka Kraigher  Forestry, wood and paper technology  Researcher  2011 - 2013  1,294 
5.  17034  PhD Nike Krajnc  Forestry, wood and paper technology  Researcher  2011 - 2013  910 
6.  12796  PhD Janez Krč  Forestry, wood and paper technology  Researcher  2011 - 2013  308 
7.  15108  PhD Lado Kutnar  Forestry, wood and paper technology  Researcher  2011 - 2013  766 
8.  29335  PhD Matevž Mihelič  Forestry, wood and paper technology  Researcher  2011 - 2013  96 
9.  19950  MSc Mitja Piškur  Forestry, wood and paper technology  Researcher  2011 - 2013  368 
10.  22576  PhD Anton Poje  Forestry, wood and paper technology  Researcher  2011 - 2013  129 
11.  11619  MSc Robert Robek  Forestry, wood and paper technology  Researcher  2011 - 2013  292 
12.  10264  PhD Primož Simončič  Forestry, wood and paper technology  Principal Researcher  2011 - 2013  680 
13.  22592  PhD Urša Vilhar  Forestry, wood and paper technology  Researcher  2011 - 2013  398 
14.  28401  PhD Peter Železnik  Forestry, wood and paper technology  Researcher  2011 - 2013  180 
Organisations (2)
no. Code Research organisation City Registration number No. of publications
1.  0404  Slovenian Forestry Institute  Ljubljana  5051673000  11,842 
2.  0481  University of Ljubljana, Biotechnical Faculty  Ljubljana  1626914  64,298 
Abstract
By using newer technologies such as timber or tree felling method, the harvest with the cable crane or harvester/forwarder, forestry tractor trailer or by direct harvesting with the combined machines etc. in this way total tree biomass could be exploited. In doing so, all above the tree stump could be exploited for the production of green chips. In Slovenia, there were only a few individual assessments and impact analysis of potential impacts of such a system of exploitation of forests from the environmental, technological and economic point of view. In practice, the estimates of the impact of utilization of biomass in the forest ground and forest stands are scarce. It is necessary to lay down the rules for the intensity of use of the above-ground biomass. Also establish classes of forest types and make an assessment in what conditions and in which habitats, the use of tree harvesting method could be used. Increased output and thus removal of nutrients (leaves and needles) with the simultaneous use of modern machinery (harvesting and harvesting) may result in increased removal of material from the forest and cause the damage to forest soils. Intense nutrient removal as a result of exploitation may in some way be compared to litter gathering, this means removal of leaf litter fall from the forest. Depending on the ability of forest sites, stands and their characteristics, and knowledge of the processes of circulation and nutrient stocks, we can presume the limits of ‘whole tree removal’ from the forest. The use of mechanical harvesting in Slovenian forests should carefully consider due to its damage to the forest floor and stands. We will continue to produce guidance and good practice guide, which will be environmentally friendly, but will nevertheless guide the implementation of economically efficient mechanical harvesting. The project work will address the following methods of logging and harvesting, tree (or half-tree) method with chainsaw felling and skidding with cable crane in combination with a processor, a tree (or half-tree) complete mechanical harvesting method under regeneration phases in combination with the logging with forwarder or forestry tractor trailer or by direct harvesting with combined machine and short-wood method with a complete machine-felling and export of logging residue. These technologies differ in economic and ecological indicators of eligibility and efficiency rate of residues exploit and their quality in the finished product (usually green wood chips). There are differences in the economics of production, according to tree type and developmental stage of the stand. Part of the task is to develop a recording the potential of wood above-ground biomass and to prepare a proposal for its inclusion into the forest management plans. In practice, field foresters do not have the relevant professional guidelines to be able to set the limits on the exploitation of the total above-ground mass. Potential of non-stem  wood mass is unknown and therefore it would be useful to define it limits in the SFS database. The estimation of the actual amount of the available non-stem wood biomass, which is lower than the potential one, the ministry in charge of the sector could have received an assessment of the potential for achieving the objectives of the RES. Given the short-term framework of the task (24 months) to achieve the objectives we suggest that in order to reach the goals (1) impact assessment on the use of above-ground biomass of forest stands and on the forest floor, (2) establish the conditions of use of the above-ground biomass for each forest type, (3) prepare critical assessment of potential methods of tree harvesting and (4) the development of recording of the potential above-ground biomass and the proposal for its inclusion into the forest management plans, we use all available existing studies, research, and foreign experience and on-going synergy links with domestic or international projects.
Significance for science
The project V4-1126 „Possibilities and limitations of obtaining biomass from forests“ is plicative CRP project but contains also elements of basic research work, which relates primarily to the acquisition of basic data at the field (soil science, tree nutrition studies, NFI measurements), its processing and modeling as method was used for first time (regarding literature) for the purposes of calculating the outputs of nutrients due to the intensity of logging and removal of various parts of the trees from the forest (stem, branches, leaves/needles). Our goal was to obtain an assessment of nutrient removal by calculating so-called "Return period" on the basis of domestic and foreign databases and literature data. In addition asessments of forest soil damages due to the use of heavy mechanization in forestry. Important part of work present also the creation of "the decision matrix".
Significance for the country
Within planning of forest-wood chain, whose development is currently one of the highest priorities of Slovenia development activities, is important decision process which forestry operation technology will be used regarding to a given terrain and weather conditions. For a quality selection of the appropriate technology model of wood chips production explicit and comparable descriptions of possible technologies need to be curry out. Within the project we defined 12 technological models, which represent a combination of roundwood production technologies and green chips from the standing tree to the products at the truck road. The decision-making matrix tool, which was proposed within the project, is a tool with which we approach to the operative planning or to the preparation of the work. Contemporary preparation work is not only a tool for rationalization of the production and increase of the economic aspects of production, but also a tool which enable to manage the environmental aspects of wood and biomass production.
Most important scientific results Annual report 2012, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2012, final report, complete report on dLib.si
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