Abstract
Bioenergy accounts for 61.7% of all renewable energy sources, with solid fuels accounting for 43% of this amount. Poplar plantations can deliver woody biomass for energy purposes. A field experiment with poplar was located in the north-east of Poland on good quality soil formed from medium loam. The study aimed to determine the yield, the energy value of the yield and the thermophysical properties and elemental composition of the biomass of four poplar clones harvested in two consecutive 4-year harvest rotations. The highest biomass energy value was determined in the UWM 2 clone in the second harvest rotation (231 GJ ha−1·year−1). This value was 27–47% lower for the other clones. The biomass quality showed that poplar wood contained high levels of moisture and low levels of ash, sulphur, nitrogen and chlorine. This indicates that poplar can be grown in the north-east of Poland and that it gives a yield with a high energy value and beneficial biomass properties from the energy generation perspective.
Highlights
Renewable energy sources (RES) are enjoying increasing interest, both on the global scale and in the European Union (EU-28) [1,2,3,4,5,6]
Biomass Yield and its Energy Value. Both the poplar biomass yield and its energy value were significantly differentiated by the clone, harvest rotation and the interaction of these attributes (Table 1)
The average dry biomass yield for the four poplar clones under study was lower in the second rotation: 10.1 Mg ha−1 year−1 DM, and it was very low in the first rotation: merely 3.6 Mg ha−1 year−1 DM
Summary
Renewable energy sources (RES) are enjoying increasing interest, both on the global scale and in the European Union (EU-28) [1,2,3,4,5,6]. It is noteworthy that bioenergy plays a major role as renewable energy in the EU-28 as it accounted for 61.7% of all RES, with solid fuels accounting for 43% of that amount. Bioenergy plays still a larger role as renewable energy in Poland as it accounted for 81.5% of all RES, with solid fuels accounting for 70.5% of that amount. Wood can be obtained from plantations of woody crops (e.g., poplar, willow, black locust, eucalyptus) set up on agricultural land for biomass production in short harvest rotations. The production of biomass as feedstock for energy generation and industrial processes on short rotation woody crops (SRWC)
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