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    Author(s): R. Z. Callaham; A. R. Liddicoet
    Date: 1961
    Source: Journal of Forestry, Vol. 59(11): p. 814-820
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (1.3 MB)


    Early returns from a study of altitudinal variation of pines along an elevational transect in California indicated middle elevation sources grew best regardless of the elevation of planting, seeming to contradict the old maxim, "Local seed source is best" (6). Later returns bring some support for the maxim as local seed sources assert them selves after 20 years. Nonlocal seed sources do not keep up the growth pace or are hard hit by environmental factors.

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    Callaham, R. Z.; Liddicoet, A. R. 1961. Altitudinal variation at 20 years in ponderosa and jeffrey pines. Journal of Forestry, Vol. 59(11): p. 814-820

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