Growth Data for 29 Years from the California Elevational Transect Study of Ponderosa Pine
Abstract: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. Forest Sci. 19:31-39.
Document Type: Journal Article
Affiliations: Geneticist, Pacific Southwest Forest and Range Experiment Station, Forest Service, USDA, P.O. Box 245, Berkeley, California
Publication date: 1973-03-01
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Ranking: 16 of 66 in forestry
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