New Zealand Journal of Botany abstract
Comparison of frost tolerance of Nothofagus solandri var.
cliffortioides (Hook.f.) Poole and Nothofagus menziesii (Hook.f.)
Oerst.
OSBERT J. SUN
NZ Forest Research Institute Limited
Private Bag 4800
Christchurch, New Zealand
GEOFFREY B. SWEET
School of Forestry
University of Canterbury
Private Bag 4800
Christchurch, New Zealand
Abstract Frost tolerance was investigated in both
cold-hardened and actively growing seedlings of Nothofagus solandri var.
cliffortioides and Nothofagus menziesii in New Zealand. Seedlings
of the two species from the same geographical origins showed similar tolerances
to simulated mid winter and summer frosts when grown in a common environment.
The maximum frost hardiness (LT50) ranged from -9.0 +/- 0.8 to -12.1 +/-
0.6deg.C in N. solandri, and from -10.0 +/- 0.7 to -12.4 +/- 0.1deg.C in
N. menziesii. Both species exhibited provenance variations in frost
tolerance that corresponded with variation in long-term means of annual minimum
temperature and frost days per annum of the seed origins. It is suggested that
low temperature may not be a key environmental factor in differentiating the
presence of the two species at upper timberlines in New Zealand.
Keywords frost tolerance; geographical distribution;
Nothofagus menziesii; Nothofagus solandri var.
cliffortioides; provenance; timberline
B95034
Received 14 August 1995; accepted 11 December 1995
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