Distributions and Losses of Logging Residues at Clear-Felled Areas during Extraction for Bioenergy: Comparing Dried- and Fresh-Stacked Method

Forests

Bengt Nilsson¹  Daniel Nilsson¹  Thomas Thörnqvist²  Robert Harrison² 

[1] Department of Forestry and Wood Technology, Linnaeus University, SE-351 95 Växjö, Sweden;

关键词: forest fuel;    storage;    quality;    needles;    moisture content;    Norway spruce;   

DOI  :  10.3390/f6114212

来源: mdpi

【 摘 要 】

It is well known that a large proportion of available logging residues intended for extraction will not reach the energy-conversion industry, because some are lost during transportation or left on the clear-felled area. However, there is little understanding of where logging residue losses occur in the supply chain. In this study, the distribution of logging residues for two methods (dried- and fresh-stacked method) to extract logging residues were studied in one clear-felled area. In addition, residue fractions were examined in a detailed comparison. Even though the fresh-stacked method left somewhat more logging residues at the clear-felled area, the differences are small between the methods. Approximately 30% of the total amount of logging residues was left behind between the harvester heaps, with an additional 10%–15% under these heaps and approximately 2%–3% beneath the windrows. The final product that was delivered to the energy-conversion industry was very similar, regardless of the extraction method used. The delivered chipped logging residues had moisture contents of 37% and 36% following fresh- and dried-stacked methods respectively, and in both cases the needle content in the processed logging residues was approximately 10%. However, the total amount of fine fractions (needles and fines) was slightly higher following dried-stacking.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.