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    Author(s): Bruce R. Hartsough; David J. Cooper
    Date: 1999
    Source: Forest Products Journal. 49(10): 69-75
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (577 KB)

    Description

    Traditional whole-tree harvesting systems work well in short-rotation hardwood plantations, but other methods are needed where it is desirable to leave the residues on the site. We tested a system consisting of a cut-to-length harvester, forwarder, mobile chipper, and chip screen to clearcut a 7-year-old plantation of Eucalyptus viminalis. Three levels of debarking effort by the harvester (minimal, partial, and full), and two levels of screening (with and without) were evaluated. The harvester had the lowest production rate and highest cost of the system elements. Harvester production rate was strongly affected by tree size and somewhat by debarking level. Bark contents for full debarking averaged 1.5 percent; screening apparently did not reduce bark content any further. Estimated stump-to-truck costs (without screening) for the system in stands of good form varied from $19 per bone dry ton (BDT) for 1l-inch DBH trees to $72/BDT for 3-inch trees. For trees in the 5- to 1l-inch range, and an average forwarding distance of 500 feet, a balanced system would include three harvesters, two forwarders, and one chipper. The system may be cost competitive with whole-tree systems.

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    Citation

    Hartsough, Bruce R.; Cooper, David J. 1999. Cut-to-length harvesting of short-rotation Eucalyptus. Forest Products Journal. 49(10): 69-75

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