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
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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