Publication Title: Effects of landslide erosion on subsequent Douglas-fir growth and stocking levels in the western Cascades, Oregon
Year: 1984 Status: Published Publication Type: Journal Article
H. J. Andrews Publication Number: 656
Citation: Miles, D. W. R.; Swanson, F. J.; Youngberg, C. T. 1984. Effects of landslide erosion on subsequent Douglas-fir growth and stocking levels in the western Cascades, Oregon. Soil Science Society of America Journal. 48(3): 667-671.
Online PDF: http://andrewsforest.oregonstate.edu/pubs/pdf/pub656.pdf
Shallow, rapid landslides are common events in steep terrain of the Pacific Northwest. The effect of landslides on timber growth potential of forest land was estimated by examining a 30-yr history of clearcutting and landsliding in the western Oregon Cascades. The height growth of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] and stocking level of all commercial conifer species on naturally regenerated landslides were compared with the height growth and stocking level on nearby, artificially regenerated clear-cut units of similar aspect, elevation, ages, and slope position. Average height growth of Douglas-fir trees 5 to 18 years old on the landslides was reduced 62% compared to trees on clear-uts, and the average stocking level was reduced 25% from the clear-cut level. One-third of the landslide area was estimated to be nonstockable because of unstable or impenetrable substrate.
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