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D. Kajha. S. Bogdan, [. Katičić-Trupčević: PRODUKCIJA BIOMASU Kl.ONOVA BI.IKLH VRBh U POKUSNOJ ... Šumarski list hr. 9-10, CXXVIII (2004), 509-515 lation to climate, clone, rotation lenght, stem and berg, J. Sachau & M. Wiinblod (ur.): Biomass stool age. U: Chattier P., G.L. Ferrero, U.M. for Energy and the Environment. Proceedings of Henius, S. Hultberg, J. Sachau & M. Wiinblod the 9th European Bioenergy Conference Vol. 1. (ur.): Biomass for Energy and the Environment. Elsevier Science Ltd. 103 108. Proceedings of the 9th European Bioenergy Con- Telenius, B., T. Verwij st, 1995: The influence of terence Vol. 1. Elsevier Science Ltd. 702-706. allometric variation, vertical biomass distribu- Nordh, N.-E., 2003: Sustainability of willow SRF tion and sampling procedure on biomass estimaduring later cutting cycles. U: Nicholas, I. D. tes in commercial short-rotation forests. Biorc( ur.) IEA Bioenergy Task 30 Proceedings of the source Technology 51: 247-253. Conference: The role of short rotation crops in Vcrwi j st, T, 2003: Short rotation crops in the world, the energy market. December 1-5, 2003. Mount U : Nicholas, I. D. (ur.) IEA Bioenergy Task 30 Maunganui, Tauranga, New Zealand. Str. 93-98. Proceedings of the Conference: The role of short Ridde 11-Black, D.M., C. Rowlands & A. Snel - rotation crops in the energy market. December son , 1996: Short Rotation Forest Productivity 1-5, 2003. Mount Maunganui, Tauranga, New Using Sewage Sludge as a Nutrient Source. U: Zealand. Str. 1-10. Charticr P., G.L. Ferrero, U.M. Henius, S. Hult- SUMMARY: A test with 14 white willow clones was conducted on the locality qf´Dravica (northeastern part of Croatia, near Osijek) following the randomized complete block system design with four replications. Clonal test was established by cuttings in March 1999, with 1.3 x 0.8 m spacing. The goal was to determine the potential of biomass production of selected clones in short rotations of 2 years, on the site not favorable for growing more valuable species of forest trees. At the age of 2/5 (2 years old shoots and 5 years old stump) diameter at breast height, survival and a number of shoots per stump was measured, and using the combination of the destructive and nondestructive methods, dry biomass of a single two year old shoots was assessed. The production of biomass per hectare was estimated with respect to the clones, mean dry biomass of shoots, survival, spacing, and the average number of shoots per stump. Average survival rate was 65.6 %, but there were significant differences between clones. The overall mean diy biomass production of all the investigated clones was 6.5 tons per hectare. The greatest production exhibited clones ´B44´, ´V093´and ´V052´(10.2, 9.2 and 9.1 t/ha). Clones ´B44´and ´V093´ showed specific adaptability to the investigated site and growth conditions through survival, above the average values of the total biomass production, as well as the greatest sprouting ability. Clones ´V052 ´and ´VI60´showedgood adaptability to tested site conditions through survival rate and sprouting ability, although their values of the mean dry biomass were average. For the purpose of greater productivity, after the first rotation, shoots should be reduced to one or two per stump. Research should be continued in the direction of identification and selection of a greater number of clones with specific adaptability to unfavorable sites, and the production of biomass on marginal sites could be significantly increased with the application of more intense growth and protection measures. Key wo rds: white willow clones, biomass, short rotation crops |