Primary production of calorific value of poplar clones in Slovakia
2012
Petráš, Rudolf (National Forest Centre – Forest Research Institute, Zvolen (Slovak Republic)) | Oszlányi, Július (National Forest Centre – Forest Research Institute, Zvolen (Slovak Republic)) | Jamnická, Gabriela (National Forest Centre – Forest Research Institute, Zvolen (Slovak Republic)) | Mecko, Julian (National Forest Centre – Forest Research Institute, Zvolen (Slovak Republic))
Poplar clones are characterized by very fast growth rate, a high volume of wood production and a short rotation period compared to other wood species. The greatest portion of their area is the crop land, where the forests are man-made with the poplar clones representing the stand-forming tree species. The study presents results of the calorific values on biomass of Robusta and I214 (Populus x euramericana) clones in Slovak territory. The average calorific value of all biomass fractions (wood, bark, small-wood with bark) is approximately in the range of 17.8-18.4 MJ kg-1 or 6.86-8.73 GJ m-3 . Standard deviations were in the range of only 2.4-2.8%. The calorific value production of whole stands was calculated from their volume production according to yield tables [m3 ha-1 ]. The mean annual production of calorific value for site indexes 40-20 culminated at the age of 17-26 years with values of 320-80 GJ ha-1 . The culmination for the I-214 clone occurred 2-3 years earlier than for the Robusta clone. This age is optimal for total stands felling. Robusta and I-214 poplar clones have not only fast growth, large biomass and calorific value production, but also have the high energy use efficiency in comparison to other wood species. Most of the poplar stands accumulated more than 1% heat, which originated in the solar energy.
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