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Vegetation Control for Douglas-Fir Regeneration on the Siuslaw National Forest: A Decision Analysis

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Records from 324 plantations on the Siuslaw National Forest of western Oregon were used to develop stocking outcomes from various methods of controlling competing vegetation before and after trees were placated. A decision-tree analysis indicated that if no site preparation or release were practiced, the forest as a whole would develop 63 percent of the mean annual increment and 35 percent of the present net worth expected if all means for chemical and manual vegetation control were available and used. With only manual means of vegetation control available (no chemicals), the expected values would be 78 and 57 percent, respectively. Where all means except phenoxy herbicides were available, the expected MAI and PNW were reduced only slightly. These values varied with the type of prelogging vegetation and aspect: declines were least on southwest aspects with predominantly conifers before logging and greatest on northeast aspects that had supported hardwoods. In all strata, however, a restriction against phenoxy herbicides had mirror effect. The results of this case study may or may not apply elsewhere, but the method of analysis should be useful.

Document Type: Journal Article

Affiliations: Professor of Forest Management, College of Forestry, Oregon State University, Corvallis

Publication date: 1984-03-01

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.

    2015 Impact Factor: 1.476
    Ranking: 22 of 66 in forestry

    Also published by SAF:
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