Canadian Forest Service Publications
Effect of initial mass of white spruce and lodgepole pine planting stock on field performance in the British Columbia interior. 1976. Dobbs, R.C. Government of Canada. Department of the Environment. Canadian Forest Service, Pacific Forest Research Centre, Victoria, BC. Information Report BC-X-149.
Issued by: Pacific Forestry Centre
Catalog ID: 3985
Availability: PDF (download)
Two types (2+0 seedlings and 2+1 transplants) of white spruce and lodgepole pine planting stock were graded into size classes on the basis of fresh mass and, together with styroplug-2 stock of the same species, were outplanted on blade scarified and untreated plots. Three size classes (large, medium and small) were defined for 2+0 seedlings and two classes (large and small) were defined for 2+1 transplants; styroplug-2 stock was relatively uniform in size and was not graded.
At the end of three growing seasons, survival, total height, height increment, stem diameter and dry mass were assessed and related to initial size class within each species and stock type.
Generally, "large" seedlings or transplants outperformed "small" ones, and those on scarified plots outperformed those on untreated plots. Of particular importance, large stock on untreated plots outperformed small stock on scarified plots, indicating a potential "trade-off" between stock size and site preparation which, through stock grading, may be exploited by the silviculturist.
Pine outperformed spruce; indeed, pine seedlings generally did as well as spruce transplants. Within a species, large seedlings compared favorably with small transplants. Styro-2 plugs compared favorably with seedlings and transplants of greater initial size.