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The Relationship of Lodgepole Pine Cone Age and Seed Extractability

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All closed cones were collected from the crowns of eight lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.) trees and separated by age and tree. The times in a kiln at 180°C required to melt the resin bonds holding the scales closed were recorded. Seed extraction was done at 60°C. Seed yield was determined by periodic shaking of the cones. The effect of cone moisture content upon rates of seed release was studied using three levels of cone moisture content and three bulk seed lots. This study shows that cone age is not very important (r² = 0.25) in influencing times to break resin bonds but that initial cone moisture content is (r² = 0.80). Moist cones (15 percent) break their resin bonds much more slowly than do drier cones (6 to l0 percent moisture). Cone moisture content did not vary by cone age. Since over 80 percent of the studied cones were less than 16 years old and showed little if any effect of age upon the percent of seed released, cone age was considered unimportant for limiting cone collection to cones of a specific age class. The portion of empty seed increased dramatically over the extraction period reaching 45 percent of sample after 10 hours. Forest Sci. 27:62-70.

Keywords: Pinus contorta

Document Type: Journal Article

Affiliations: Department of Forest Science, The University of Alberta, Edmonton, Alberta, Canada T6G 2G6

Publication date: 1981-03-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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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