《Table 5 The multiple comparison results on the growth characters of natural population progenies》

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

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F.mandshurica is famous for its excellent material.Excellent genotypes or production populations were selected from the differentiated populations by adhering to biological and ecological perspectives and following specific breeding objectives，with the aim to maximize the ecological，social and economic benefits of forests.There were large differences in the growth characters of the open-pollinated progenies of F.mandshurica，which had the necessary and sufficient conditions for comparison and the genetic basis for excellent population recommendation.The results of multiple comparisons are shown in Table 5.As shown in Table 5，the progenies of cultivated population LNK had good performances in tree height（2.19 m）and DBH（1.432 cm），which increased by 20.46%and 17.93%from the progenies of the other tested 12 natural populations，presenting strong growth vigor.Moreover，the variation in tree height was small between the progenies，but affected by the environmental conditions，the variation of DBH was relatively larger，which indicated that after long-term cultivation and domestication，the species had fully adapted to the ecological and climatic conditions of the introducing area，and had strong ecological coupling.Among the 12 natural populations participating in the study，the populations with the DBH and tree height of open-pollinated progenies ranking top 5 included SHT，XIL，WCH and HRN，and the mean values of the 2 characters were1.261，1.250，1.134，1.116 cm，and 1.978，1.951，1.897，1.834 m，respectively.Compared with population LSH which had the smallest DBH（0.927 cm），the DBH of the 4 populations were increased by 36.03%，34.84%，22.33%，and 20.39%，respectively，and compared with population DFH which had the lowest tree height（1.667 m），the tree height of the 4 were increased by18.66%，17.04%，13.80%，and 10.02%，respectively.Therefore，the progenies of these 4 populations performed well according to the initial determination，but it still needed further analysis on the genetic effects of the progenies to determine whether the variation on these characters originated from genotypes or environmental factors，so as to provide theoretical references for the selection of excellent populations.