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    Author(s): Michael P. Amaranthus; David E. Steinfeld
    Date: 1997
    Source: Res. Pap. PNW-RP-504. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 7 p
    Publication Series: Research Paper (RP)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (670 KB)

    Description

    This study evaluated the effect on soil bulk density of yarding small-diameter Douglas-fir (Pseudosuga menziesii var. glauca (Beissn.) Franco) with a small tractor. Levels of compaction were measured before yarding and after one trip, three trips, and six trips by the tractor. Bulk densities in the surface (10 cm) and subsurface (20 cm) for three trips and six trips were higher than pretreatment (p ≤ 0.10); however, increases in soil bulk density were less than 7 percent and well below standards for detrimental soil compaction used by the USDA Forest Service Pacific Northwest Region. Results from this study support observations made in other compaction studies that much of the increase in bulk density from ground-based yarding operations occurs in the first few trips. Other studies, however, show a much higher increase in bulk density over undisturbed values.

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    Citation

    Amaranthus, Michael P.; Steinfeld, David E. 1997. Soil compaction after yarding of small-diameter Douglas-fir with a small tractor in southwest Oregon. Res. Pap. PNW-RP-504. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 7 p

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    Keywords

    Applegate Adaptive Management Area, Douglas-fir, forest harvest, solid compaction, bulk density, logging systems, tractor-yarding

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