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Weight and volume of small-sized whole trees at different phases of the supply chain

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The measurement of the amount of energy wood can be based on volume (m3), weight (kg) or energy content (MWh). All of the previous units of measurement are being used today. However, measuring wood is problematic. Physically the measuring can be made in the forest, at the roadside storage site or at the heating plant. Nowadays crane scale weighing in the forest is the commonly used and accepted technique. In this study the differences, variations and correlations between the different energy wood measurement methods are examined. The whole supply chain from the forest to the heating plant was tracked. The material was collected from young stands and it was based on about 14,300 m3 solid (12.7 million kg) energy wood from 75 worksites. There was a strong correlation (r 2=0.87–0.98) between the values given by the different measurement methods throughout this study, although a remarkable weight loss (37%) between the forest and the heating plant was observed. Moreover, the solid volume factor 0.49 with SD 0.07 between the chips loose volume and the calculated solid volume, based on the crane scale, was higher than the 0.40 factor that is normally used in practice.

Keywords: Crane scale; energy wood; measurement; volume; weight; whole tree

Document Type: Research Article


Affiliations: School of Agriculture and Forestry,Seinäjoki University of Applied Sciences, Ähtäri, Finland

Publication date: 2012-01-01

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