Survival and growth of Picea glauca seedlings as a function of freezing temperatures and exposure times during budbreak and shoot elongation

The impact of freezing temperatures and exposure times during budbreak and shoot elongation on 10-month-old containerized white spruce seedlings [Picea glauca (Moench) Voss] was studied. Seedlings were exposed to 0, −2, −4, −6, −8 and −10°C for 0, 1, 2, 3, 4, 5 and 6 h at four stages of budbreak and...

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Bibliographic Details
Published in:Scandinavian journal of forest research 2004-06, Vol.19 (3), p.206-216
Main Authors: Bigras, F.J, Coursolle, C, Margolis, H.A
Format: Article
Language:English
Subjects:
budbreak
buds
Cold tolerance
conifer needles
environmental exposure
environmental factors
forest nurseries
freezing
frost
mortality
Picea glauca
seedling growth
seedling survival
seedlings
shoots
spring frost
statistical analysis
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Summary:The impact of freezing temperatures and exposure times during budbreak and shoot elongation on 10-month-old containerized white spruce seedlings [Picea glauca (Moench) Voss] was studied. Seedlings were exposed to 0, −2, −4, −6, −8 and −10°C for 0, 1, 2, 3, 4, 5 and 6 h at four stages of budbreak and shoot elongation (stage 1: unswollen bud; stage 2: swollen bud; stage 3: bud scales parted by emerging needles; stage 4: 1-5 cm of terminal shoot growth). Seedling and terminal bud survival, viability of first-year needles (developed before frost exposure), terminal shoot length, stem diameter and aerial dry mass were measured 90 days after freezing exposure. Frost severity had a much greater influence on seedling survival, damage and subsequent growth than exposure time. The bud development stage at which freezing temperatures were applied also affected survival and subsequent growth.
ISSN:0282-7581
1651-1891
DOI:10.1080/02827580410024115a