Genetic Gains from Tree Improvement of Ponderosa Pine in Southern Idaho

摘要

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 degrees latitude or 2.4 degrees 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.