DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 7-8/2011 str. 28 <-- 28 --> PDF |
D. Kajba, J. Domac, V. Šegon: ESTIMATION OF SHORT ROTATION CROPS POTENTIALIN THE REPUBLIC ... Šumarski list br. 7–8, CXXXV (2011), 361-370 Croatia. The issues and problems to be addressed in order to increase this production include a change in policy approach, especially aimed at small landowners, introduction of incentives and subsidies, lack of knowledge and experience in growing energy crops and generally a lack of cooperation between relevant stakeholders. Key words: biomass potential assessment, Biomass Energy Europe, short rotation crops INTRODUCTION – Uvod The main objective of the illustration case for Croatia is to estimate the energy and technical potential of fast-growing broadleaved species energy plantations on abandoned land or on land where agricultural production is not profitable, with a special emphasis on willows as a typical energy crop in South-East Europe. The patterns of energy crop production and consumption, and their associated social, economic and environmental impacts, are site-specific. Broad generalisations about the energy crop’s situation and impacts across regions, or even within the same country, have often resulted in misleading conclusions, poor planning and ineffective implementation. Adequately assessing the implications of the current patterns of energy crop production and use, and the sustainable potential of that resource, requires a holistic view and a good knowledge of the spatial patterns of woodfuel supply and demand. There is a need to conduct spatial analyses of woodfuel supply and demand that are able to articulate the local heterogeneity at the regional and European levels.There is a critical lack of studies providing full- country coverage and based on a consistent integration of data at lower geographical scales in Croatia, but also in the wholeWestern Balkan region. Looking at the achievements regarding energy crops utilisation in Croatia, the most important ones are related to the research and investigation of productivity of various types of crops. Specifically, clonal tests of short rotation crops were established in different regions in Croatia and the goal was to determine the potential of biomass production of selected willow clones in short rotations of 2 years, on the site not favourable for growing more valuable species of forest trees (Kajba et al. 1998, Kajba 1999, Bogdan et al, 2006). The production of biomass per hectare was estimated in regard to the clones, mean dry biomass of shoots, survival, spacing, and the average number of shoots per stump. Anumber of clones capable of starting initial production cultures are currently available; however, in order for biomass production in short rotations to be recognized as a useful and cost-effective form of providing energy supplies, a lot of work remains to be done in many areas, not least in the area of plant improvement. The aim of these field experiments is to select the clones of the max. production potential with the stem quality, and those poplar and willow clones which will give the satisfactory production on the so called atypical habitats for poplar and willow silviculture (e.i. the oak and ash habitats) and which can come in useful for the establishment of pre-cultivation for the purpose of easier reforestation of common oak and narrow- leaved ash.There are relatively many atypical habitats for the cultivation of poplar and especially stemlike willow silviculture in the area of the Sava river. For the purpose of greater productivity, after the each rotation, shoots should be reduced to one or two per stump. Research should be continued in the direction identification and selection of a greater number of clones with specific adaptability to unfavourable sites, and the production of biomass on marginal sites could be significantly increased with the application of more intense growth (agricultural treatments) and protection measures. MATERIALAND METHODS – Materijal i metode The methodology utilised for the purpose of estimating the SRC potential within this illustration case is based on the BEE Methods Handbook (Vis 2011), specifically in reference to chapter 4.3. (Energy crops basic and advanced spatially explicit method). According to the terminology introduced in the Handbook, the methodology for this illustration case corresponds to the basic spatially explicit method, whereas the methodology was selected mostly based on the available data required to apply it. The main source of data used is contained within the Basic pedological map of the Republic Croatia.The map was created as a result of the project coordinated by the Ministry of Science andTechnology which lasted from 1985 to 1996 and forms the basis for the estimation of soil suitability for any kind of designated utilization. Based on the different types of soils, the current utilisation and their characteristics (percentage of rocks and stone, inclination, ecological depth of soil, dreined soil, dominant mode of moistering, etc.) the total area suitable for the production of energy crops was estimated. This area was further reduced based on the information available regarding the implementation of the EU Natura 2000 network in Croatia, and thus ob |