. Ecological genetics of Pinus contorta in the Upper Snake River Basin of eastern Idaho and Wyoming. Lodgepole pine Idaho; Lodgepole pine Wyoming; Forests and forestry Research United States; Forest genetics; Trees Genetics. mean values for populations ranged from only to inches. Significant effects of populations in leaf length reflected mean differences as large as inch. And finally, the significant effects of populations for adjusted height show that populations would have differed in 3-year height even if all trees had been the same height at age 2, even though 2-year height ac
. Ecological genetics of Pinus contorta in the Upper Snake River Basin of eastern Idaho and Wyoming. Lodgepole pine Idaho; Lodgepole pine Wyoming; Forests and forestry Research United States; Forest genetics; Trees Genetics. mean values for populations ranged from only to inches. Significant effects of populations in leaf length reflected mean differences as large as inch. And finally, the significant effects of populations for adjusted height show that populations would have differed in 3-year height even if all trees had been the same height at age 2, even though 2-year height accounted for 64 percent of the variance in 3-year height of individual trees. Significant interactions of populations and environ- ments were detected only for adjusted height; conse- quently, main effects for this variable were significant with a rather low level of probability (table 2). The inter- action was caused by (1) a lack of differences between populations in the environment at high elevation, com- bined with (2) statistically detectable differences at low elevation. Consequently, subsequent analyses for adjusted height use only those data from the low- elevation site. Periodicity of Shoot Elongation The logistic function described periodicity of shoot elongation of individual trees nearly perfectly. Values of R- ranged from to essentially while averaging Analyses of variance detected strong effects of populations for duration, rate, cessation, and amount of shoot elongation (table 3). These effects accounted for 21 to 38 percent of the total variance and are illustrated in figure 2. Differences between populations were as large as 15 days in cessation, 16 days in duration, inch/day in rate, and inches in the amount of elonga- tion. Populations differed by only day in the initia- tion of shoot elongation, and, consequently, no differ- ences could be detected statistically. Cold Hardiness Effects of test temperatures dominated analyses of vari
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