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    Author(s): Robert H. Ruth; Carl M. Berntsen
    Date: 1955
    Source: USDA Forest Service PNW Old Series Research Paper No. 12: 1-13
    Publication Series: Research Paper (RP)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (940 KB)


    Four years' measurement of seed fall in the spruce-hemlock type on the Cascade Head Experimental Forest indicates that an ample supply of seed is distributed over clear-cut areas under staggered-setting cutting. The largest tract sampled was 81 acres; in spite of a seed crop failure in 1950, it received an average of 243,000 viable spruce and hemlock seeds per acre yearly on a high ridge near the center of the area. In the spruce-hemlock type it is apparently practical to clear cut fairly large openings and still depend upon adjacent stands for an adequate distribution of seed.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Ruth, Robert H.; Berntsen, Carl M. 1955. A 4-year record of sitka spruce and western hemlock seed fall on the Cascade Head Experimental Forest. USDA Forest Service PNW Old Series Research Paper No. 12: 1-13

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