Notes: Effects of Nitrogen Fertilization and Low Thinning on Snow Damage in Jack Pine
A nitrogen fertilization-thinning trial was established in a 12-year-old stand of jack pine (Pinus banksiana Lamb.) near Thunder Bay, Ontario, Canada. Treatments consisted of two levels of nitrogen (N) fertilization (0 and 400 kg N ha-1) and two levels of low thinning (0 and 40 percent of initial stand volume removed). During the second winter following treatment, trees throughout the study area were bent and broken by the accumulation of snow in their crowns. The heaviest damage, however, occurred on plots treated with nitrogen. A subsequent study of N effects on apical shoot elongation and needle elongation revealed that the needles of N fertilized trees averaged 23 percent longer than those of trees that did not receive N. Nitrogen had no effect on shoot elongation. We conclude that N fertilized trees, due to their longer needles, accumulated more snow and as a result suffered heavier snow damage than did trees that received no N. Low thinning reduced the size of the population at risk to snow damage, but it had no effect on the distribution of trees among four snow damage severity classes. Forest Sci. 31:552-556.
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Document Type: Miscellaneous
Affiliations: Supervisor of Forestry and Research, Western Forest Products Ltd, 1111 W. Georgia St., Vancouver, B.C. V6E 3H1, Canada
Publication date: 1985-09-01
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