Rehfeldt, G. E. 



1980. Genetic gains from tree improvement of ponderosa 

 pine in southern Idaho. USDA For. Serv. Res. Pap. 

 INT-263, 9p. Intermt. For. and Range Exp. Stn., 

 Ogden, Utah 84401 



The 16-year heights of ponderosa pine progenies from 268 

 half-sib families representing 37 southern Idaho populations 

 were compared on four test sites. Analyses of population 

 differentiation showed that a genetic gain in 16-year height 

 of about 4 percent will result from collections of seed in 

 selected populations. But seed for reforestation should not 

 be transferred more than 460 m elevation, 1.4° latitude or 

 2.4° longitude. Quantitative genetic analyses implied that 

 genetic gains of 8 to 14 percent can be expected in the height 

 of 16-year-old progeny of selected families and individual 

 trees . 



KEYWORDS: genetic variation, ponderosa pine, heritability , 

 genetic gain, seed zoning 



Rehfeldt, G. E. 



1980. Genetic gains from tree improvement of ponderosa 

 pine in southern Idaho. USDA For. Serv. Res. Pap. 

 INT-263, 9 p. Intermt. For. and Range Exp. Stn., 

 Ogden, Utah 84401 



The 16-year heights of ponderosa pine progenies from 268 

 half-sib families representing 37 southern Idaho populations 

 were compared on four test sites. Analyses of population 

 differentiation showed that a genetic gain in 16-year height 

 of about 4 percent will result from collections of seed in 

 selected populations. But seed for reforestation should not 

 be transferred more than 460 m elevation, 1.4° latitude or 

 2.4° longitude. Quantitative genetic analyses implied that 

 genetic gains of 8 to 14 percent can be expected in the height 

 of 16-year-old progeny of selected families and individual 

 trees. 



KEYWORDS: genetic variation, ponderosa pine, heritability, 

 genetic gain, seed zoning 



