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Effects of Snowbrush on Growth of Some Conifers

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Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) seedlings, planted in snowbrush (Ceanothus velutinus Dougl.) stands 0-15 years old, survived and developed significantly better than ponderosa pine (Pinus ponderosa Laws.), western hemlock (Tsuga heterophylla [Raf.] Sarg.). and noble fir (Abies procera Rehd.) under the same conditions. Capacity of all four species to dominate the site was greatest in snowbrush at age 0, decreasing with increasing age of the snowbrush. Snowbrush attains full occupancy of the site in about ten years, causing serious suppression after that time. Growth in height of six naturally developing conifers was reduced by one-half under suppression by snowbrush. Findings indicate that snowbrush is more detrimental than beneficial in forest regeneration on west slopes of the Oregon Cascades.

Document Type: Journal Article

Affiliations: Graduate Research Assistant, School of Forestry, Oregon State University, Corvallis

Publication date: April 1, 1969

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    Also published by SAF:
    Forest Science
    Other SAF Publications
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