Genetic and environmental components of variation of site index in inland Douglas-fir.
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Combining the genetic index and simple environmental variables accounted for nearly half the variation in site index, and a strong correlation between genotype and environment, reflecting the steep adaptive clines that are well known for this species.Abstract:
(...) An index to genetic variation, based on 3-year seedling height in provenance tests, accounted for approximately 40% of the variation in both 50-year and 100-year dominant height (i.e., site index) among 135 natural stands in northern Idaho and western Montana. Combining the genetic index and simple environmental variables (elevation, habitat series, latitude, longitude) accounted for nearly half the variation in site index. Path analyses estimated a strong correlation (0.76) between genotype and environment, reflecting the steep adaptive clines that are well known for this species. (...)read more
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