《Table 4 The variance analysis results on the growth characters of progenies from natural population

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《Progeny Test on the Natural Populations and Selection of Excellent Populations from Fraxinus Mandshurica》

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*indicates significant difference at the level of 5%；**indicates extremely significant difference at the level of 5%.

F.mandshurica is a precious species of broad-leaved trees with fast growth，strong adaptability and ecological coupling，and high economic value.In order to investigate the genetic variation trend of the growth traits of natural populations in different ecological environments，520 individual plants（including controls）from13 populations were tested and evaluated，and the tree height and DBH of open-pollinated progenies were determined.The results of the measurement and analysis of variance are shown in Tables 3&4，respectively.As shown in Table 3，the overall mean values of tree height and DBH were（1.818±0.418）m and（1.099±0.455）cm，respectively，and the fluctuation ranges in the 5%confidence interval were between 1.782-1.854 m and 1.061-1.139 cm，respectively.The variation of tree height in natural population was small，and the variation of DBH was larger.The average coefficient of variation was 22.99%and 41.37%，respectively.The variation of tree height and DBH was the greatest in the progenies of population HRN，for which the variation coefficients were 27.54%and 52.71%，respectively.The variation of tree height was the smallest in the progenies of population TWH，and the variation of DBH was the smallest in the progenies of population DFH.As shown in Table 4，the tree height and DBH of the progenies of different populations were basically in normal distribution，and there were abundant variations.The significance probability between the populations was far less than 0.05，and the difference was extremely significant at the level of 5%.