Energy-related Characteristics of Poplars and Black Locust

Szabolcs Komán

Abstract


Poplar and black locust plantations are widely used for production of raw materials for biofuel. In this study, the main characteristics affecting energy content were evaluated for 2-year-old plantations obtained from 3 different sites of various qualities were evaluated. The ‘I-214’ poplar and the black locust had smaller (16 to 21%) bark ratios, while the ‘Kopecky’ poplar had a higher (22 to 26%) bark gain yield. The black locust had a higher basic density than that of the poplars, which were wood (446 kg/m3) and bark (402 kg/m3). The higher heating value of the bark of the black locust (19.51 to 19.59 MJ/kg) and of the ‘Kopecky’ (19.58 to 19.86 MJ/kg) was greater than that of the wood; in the case of the ‘I-214’ (19.59 to 19.81 MJ/kg), the higher heating value of the wood was higher. The ash content of the bark (4.50 to 8.22%) was several times greater in the case of poplars and black locust than that of the wood (0.46 to 1.29%). In the case of the wood, the ash content increased by the degradation of the site's quality. There were remarkable differences between the black locust and the poplars, as well as the individual poplar clones among the main energetic characteristics.

Keywords


Poplar; Black locust; Heating value; Basic density; Ash content; Wood-bark ratio

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