Effects of Root Freezing on the Physiology and Growth of Picea glauca, Picea mariana and Pinus banksiana Seedlings Under Different Soil Moisture Regimes

The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial frost to induce different levels of root damage. Frost-damaged and control seedlings were placed in a greenhouse under high and low soil moisture r...

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Bibliographic Details
Published in:Scandinavian journal of forest research 2002, Vol.17 (3), p.206-217
Main Authors: Coursolle, Carole, Bigras, Francine J, Margolis, Hank A
Format: Article
Language:English
Subjects:
Biomass
Black
carbon dioxide
Containerized
freezing
frost
greenhouses
Jack
nitrogen content
Photosynthesis
Picea glauca
Picea mariana
Pine
Pinus banksiana
Potential
Ratio
Root
root systems
seedling growth
Seedlings
Shoot
shoots
soil water regimes
Spruce
temperature
Water
White
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Summary:The root systems of 2-yr-old Picea glauca, Picea mariana and Pinus banksiana seedlings were submitted to various frost temperatures during an artificial 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.
ISSN:0282-7581
1651-1891
DOI:10.1080/028275802753742873