Can field mortality of lodgepole pine (Pinus contorta var. latifolia) families be predicted based on early freezing test results?
1997
Ericsson, T. | Andersson, B. (Forestry Research Inst. of Sweden, Savar (Sweden))
Individuals from 119 half-sib family seed lots of lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) collected in the Yukon territory (Canada) were freeze-tested for frost tolerance classification as one-year-old seedlings during the autumn frost hardening period. Hardening was induced artificially by manipulating temperature and photoperiodic conditions in a greenhouse. Members of the same families were also planted as one-year-old seedlings on three sites in northern Sweden and assessed at 13-14 years of age. The correlation between field survival and freezing test damage (pooled r=0.164) was weaker than that frequently obtained for Scots pine (Pinus sylvestris L.). The assessment of family performances separately by source stand did not add significant information regarding correlation structures
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