Pacific Northwest Research Station

Title: A 4-year record of sitka spruce and western hemlock seed fall on the Cascade Head Experimental Forest.

Author: Ruth, Robert H.; Berntsen, Carl M.

Date: 1955

Source: USDA Forest Service PNW Old Series Research Paper No. 12: 1-13

Station ID: OSP-PNW-012

Description: 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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Citation

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