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    Author(s): M. Thompson Conkle
    Date: 1973
    Source: Forest Science. 19(1): 31-39
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (552 KB)


    Ponderosa pine progenies from parents restricted in latitude but spanning 7.000 feet of elevation show significant growth differences in plantations at low-, mid-, and high-elevation test sites. At low- and mid-elevation sites tree heights and diameters of progenies from high-elevation parents were the smallest; those from the low-elevation parents, intermediate; and those from mid-elevation seed parents, largest. At the high elevation site, trees from mid- and high-elevation sources grew equally well, whereas trees from low-elevation parents showed poorest growth. The variation associated with elevation zone of parent trees accounted for 8 percent of the total experimental variation. About 9 percent of the total was attributed to the interaction between parent tree elevational zones and plantations. Height rankings of progenies for different ages showed little change over the 29-year growth period of the study in low- and mid-elevation test sites. But at the high-elevation test site, height means for zone groups shifted with age as the relative heights of the higher elevation progenies increased.

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    Conkle, M. Thompson. 1973. Growth data for 29 elevational transect years from the California study of ponderosa pine. Forest Science. 19(1): 31-39.


    Pinus ponderosa Laws., elevational transect, genetic adaptation, genotype and environmental interaction

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