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

Abstract

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.

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