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Cold Hardiness of Needles of Pinus strobus L. as a Function of Geographic Source

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Cold hardiness of needles was determined in 14-year-old trees of Pinus strobus L. from 15 different seed sources on a single site. Hardening was first apparent in September, increased in fall and early winter, and reached a maximum by midwinter. Needles from northern sources were hardier than those from southern sources at all sampling dates. By late April, differences in hardiness among sources had disappeared. Trees dehardened readily in response to one week of high temperature following the December 14 sampling date. Inclusion of either latitude or average annual minimum temperature in a multiple linear regression equation along with longitude and elevation resulted in the best prediction of hardiness. All needles attained levels of hardiness greater than would be required to escape cold injury in the natural habitat. Forest Sci. 20:135-141.
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Keywords: Adaptation; genetic variation; geographic variation

Document Type: Journal Article

Affiliations: Associate Professor, Department of Horticulture, Purdue University, West Lafayette, Indiana

Publication date: 1974-06-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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