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Notes: Specific Gravity Variation in a Loblolly Pine Seed Source Study in the Western Gulf Region

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Specific gravity in 28 plantings of the Western Gulf Forest Tree Improvement Program seed source study varied by provenance, family within provenance, and test location. Trees from south Arkansas had the highest specific gravity (0.424) while those from south Louisiana had the lowest (0.398). Southeast Texas and north Louisiana trees were intermediate with an average specific gravity of 0.405. Trees from a North Carolina coastal source had the lowest specific gravity in the five plantings in Arkansas and Oklahoma in which they were included. Families generally ranked the same in all tests. This implied that specific gravity was under strong genetic control and genotype by environment interaction was not operationally meaningful. However, specific gravity was environmentally sensitive as it varied significantly among locations. Environmental and genetic patterns of variation did not agree; therefore, in situ studies of regional specific gravities should not be used for making seed movement decisions. For. Sci. 34(3):798-803.

Keywords: Pinus taeda L; geographic variation; wood density

Document Type: Miscellaneous

Affiliations: Associate Geneticist, Texas Forest Service and Assistant Professor, Department of Forest Science, Texas Agricultural Experiment Station, College Station, Texas

Publication date: September 1, 1988

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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