DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 7-8/2011 str. 32 <-- 32 --> PDF |
D. Kajba, J. Domac, V. Šegon: ESTIMATION OF SHORT ROTATION CROPS POTENTIALIN THE REPUBLIC ... Šumarski list br. 7–8, CXXXV (2011), 361-370 sented in the previous chapter, the following area re-the first type of soils, with this average rising to 11 t -1 mains in regards to the technical potential for energy crops in Croatia: Forest area suitable for energy crops: 46 850 ha Agricultural area with moderately suitable soils and limited soil suitability: 235 650 ha Of the total forest area, about 28 450 ha are heavy hydromorphous clay type of soils and 18 400 ha are slightly better clay type of soil. The production of -1 about 8 t DM per ha*y on average can be expected on Economic indicators (costs of production) – There are some economical studies about energy crops profitability, based on experimental field cultivation of 1 – 50 ha in the eastern regions of Europe, but not fully operated in a commercial way.Those studies present establishment cost of 1 500 – 2 500 € for willow and some studies seem to overestimate incomes because of -1 possible yields of >20 DM per ha*y .Today, costs for the short rotation coppice willow are in range of 4.3 to 5.8 €/GJ, depending on the region. For comparison, costs for straw and forest residues are between 2.4 €/GJ and 5 €/GJ. For the future, it can be expected that biomass costs will equalize throughout Europe and drop to about 3.5 €/GJ to 4 €/GJ free plant gate. According to the tariff system of Hrvatske Šume d.o.o. (Croatian Forests Ltd), the cost of establishing one ha of a short rotation willow coppice (9000 ps/ha) is about 30 000 kuna/ha (4 000 €). Research to date has confirmed that these crops are the most suitable for production and cultivation in heavier types of hydromorphic soils.The above sum includes the cost of soil preparation (ploughing and disc-harrowing), the price of seedlings (cuttings) and two tending operations during the first year of the establishment of the culture. Additional tending costs are estimated at 18 000 kn/ha (2 400 €).These costs include 20 wages for hilling and two between-the-row rotations with mechanization. The total cost of establishing and cultivating one hectare of SRC is thus estimated at 48 000 kn (6 400 €). On average, with six rotations (six cutting operations executed two years apart) and with an average produc -1 tion of 12 t DM per ha*y , the overall production for a 12-year period is estimated at 144 t DM per ha*.The DM per ha*y in better sites. A maximum average production of 12 t DM per ha/y can be expected on the agricultural area with moderately suitable soils and limited soil suitability. Taking into account the mentioned values, the total yield corresponding to the theoretical potential amounts to 3 257 800 t DM/y.Applying the standard energy content for willow wood of 18.4 MJ/kg DM this translates into 60 PJ/y. Ekonomski pokazatelji (troškovi proizvodnje) -1 average annual sequestration of 15 t CO ha in the 2 -1 same period amounts to 144 t COha in all. 2 The calculation for short rotation coppices of willow clones over the 12 production years is as follows: – Total establishment and maintenance costs of one ha SRC = 48 000 kn (6 400 €), – Atotal of 144 t DM per ha* will be produced, – The cost of produced biomass is 48,000 kn / 144 t = 333 kn (i.e. 45.6 €/t) – The total quantity of sequestered CO emissions is 2 estimated at 144 t CO/ha 2 It is important to point out that, contrary to some neighbouring countries, and due to the lack of stimulating measures of the state, plantation afforestation is still restricted mainly to the state owned land. Certain measures of state policy on the use of land, as well as the fiscal and incentive measures (tax exemption, credit, provision of plant material and technology support) could help poplar and willow cultivation on privately owned marginal land. These processes, to a lesser degree, are initially present, but on the local level. The calculation of a SRC establishment does not include support by the Ministry. Unlike Croatia, support in the form of exemption from land taxes for the period of 15 years is a common practice in the EU countries. Costs of establishing and maintaining 1 ha by a private farmer would be much lower compared to the cost of Croatian Forests Ltd due to the use of the farmer’sown modified agricultural mechanization and labour force. ANALYSIS AND DISCUSSION –Analiza i diskusija Data gaps and methodological challenges – Nedostaci u podacima i primjene metodologije The methodology and data utilisation/requirements for the estimated theoretical and technical potential for short rotation crops in Croatia are based on the Basic pedological map of the Republic of Croatia, which was created as a result of the project coordinated by the Ministry of Science andTechnology which lasted from 1985 to 1996. In that regard the following can be concluded regarding the adequacy of used data: 1. The Basic pedological map of Croatia was developed in 1996, and while it is a fact that soil type changes are rather slow and take many years, a data update is considered necessary; |