Canadian Forest Service Publications

Effects of root freezing on the physiology and growth of Picea glauca, Picea mariana and Pinus banksiana seedlings under different soil moisture regimes. 2002. Coursolle, Carole; Bigras, F.J.; Margolis, F.A. Scand. J. For. Res. 17: 206-217.

Year: 2002

Issued by: Laurentian Forestry Centre

Catalog ID: 37989

Language: English

Availability: PDF (request by e-mail)

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The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artiŽficial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture regimes. Seedling growth and physiology were evaluated periodically. Seedling survival was reduced when root damage reached levels of 60–80%. Root systems of all three species showed partial to total recovery by the end of the experiment. In general, root freezing damage caused reductions in seedling growth, with these reductions becoming less significant over time. Root damage had little to no effect on black spruce and jack pine seedling physiology, while white spruce CO2 uptake decreased with increasing root damage. Shoot nitrogen content of all three species decreased slightly with increasing root damage.