Author： Riemenschneider Don E.
Publisher： Society of American Foresters
ISSN： 0015-749X
Source： Forest Science, Vol.34, Iss.4, 1988-12, pp. : 1076-1082
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Abstract
Heights of jack pine trees from 101 open-pollinated families were measured at ages 1, 2, 3, 5, and 7 years. Age-age genetic and phenotypic correlations, and age-related fluctuations in heritability were evaluated to determine the optimal age for juvenile selection. Simple linear regressions of genetic and phenotypic age-age correlations on the natural log of the ratio of the two ages were significant (r² = 0.84 and 0.93 respectively). Genetic age-age correlations were greater than corresponding phenotypic correlations, particularly at longer age intervals. Heritability for tree height was highest at age 1 year, lowest at age 2, and intermediate thereafter. Results suggests that selection as early as age one would be an efficient strategy for improving rotation-age growth. For. Sci. 34(4):1076-1082.
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