Nordfjell, Tomas
- Institutionen för skoglig resurshushållning, Sveriges lantbruksuniversitet
- Sveriges lantbruksuniversitet, Sveriges lantbruksuniversitet
Forskningsartikel2011Vetenskapligt granskadÖppen tillgång
Nordfjell, Tomas; Athanassiadis, Dimitris; Lindroos, Ola; Nordfjell, Tomas
Even though stumpwood may become a significant part of the future fuel mix for combined heat and power plants in Sweden, the harvesting of stumps after regeneration felling is still only performed on a trial basis. Results from time studies on two, 23 tonne, excavators fitted for stump lifting, together with follow-up data on stump lifting and forwarding, are presented. Lifting, splitting, and piling the stumps accounted for 17, 32, and 32%, respectively, of the total productive work time. A predictive model was developed to estimate operational times and productivities when lifting pine and spruce stumps. Stump diameter, species, and terrain conditions contributed significantly to the fit of the model. The model predicts that productivity of stump lifting in spruce sites with easy terrain conditions and average stump diameters of 20 and 40 cm will be 1.23 and 4.19 oven-dry tonnes (ODT) per productive work hour, respectively. This is 43% higher than in pine sites with difficult terrain conditions and the same diameters. In the follow-up data, the productivity in stump lifting varied from 1.5 to 2.9 ODT per productive work hour while the cost for lifting and extraction to roadside varied from 37.8 to 59.4 (sic)/ODT.
Excavator; forest fuels; Norway spruce; Scots pine; time study
Scandinavian Journal of Forest Research
2011, Volym: 26, nummer: 5, sidor: 437-445
SDG15 Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald
Skogsvetenskap
DOI: https://doi.org/10.1080/02827581.2011.573502
https://res.slu.se/id/publ/51169