Study On The Growth Variation And Multipoint Analysis Of Stability Of Hybrid Larch

In the study,the 10-year-old and 13-year-old hybrid larch were used as the main research object,combined with the growth traits of 4-year-old,6-year-old,and 8-year-old hybrid larch.The main analysis methods used in this study included variation analysis,variance analysis,multiple comparisons,stability analysis and correlation analysis,etc.,so as to select families with rapid growth,strong adaptability and good stability,the main conclusions are as follows:There were abundance variations in tree height,diameter at breast height,and volume traits.The mean values of the coefficient of variation of tree height,DBH,and volume were 14.65%,21.55%,and 47.32%,respectively.The same families with high variation of volume in the two years were L.gmelinii10×L.kaempferi13 and L.gmeliniil2×L.gmelinii2(Cuo Hai),L.gmeliniil2×L.gmelinii2(Fu Jin),L.kaempferi5×L.gmelinii12,L.olgensis73-4 and L.kaempferB ×L.gmelinii9(Lin Kou),L.gmelinii5 ×L.gmelinii9,L.kaempferi5×L.olgensis77-3,and L.gmeliniilOxL.kaempferil3(Tie Li).The tree height,DBH,and volume traits of larch hybrids had extremely significant differences at the family level.The mean values of heritability of tree height,DBH,and volume of the 2 years were 89.48%,86.27%,and 88.08%,and the mean genetic gains were 23.57%,34.29%and 75.75%.Multiple comparisons in the four annual,the average tree height in the top five was 5.68%,6.98%,6.59%,and 4.95%more than the mean of all treatment,and the average DBH was 9.33%,8.93%,11.92%,and 7.94%more than the mean of all treatment,and the average volume was 21.82%,21.59%,24.77%,and 19.25%more than the mean of all treatment.According to the tree height traits of hybrid larch,the superior families were selected.The same families in the two years were L.kaempferi5×L.gmelinii9,L.kaempferi11×L.gmelinii2 and L.gmelinii7×L.kaempferi77-2(Cuo Hai),L.kaempferi5 ×L.olgensis78-3(Fu Jin),L.kaempferi5×L.gmelinii9,L.kaempferi11×L.gmelinii2,andL.kaempferi5 ×L.olgensis78-3(Lin Kou),L.gmelinii6×he6 and L.gmeliniilo×L.kaempferil3(Tie Li).According to the DBH traits of hybrid larch,the superior families were selected.The same families in the two years were L.kaempferi5 xL.gmelinii9,L.gmelinii7×L.kaempferi77-2 and L.kaempferi 12 ×L.gmelinii9(Cuo Hai),L.kaempferi5×L.olgensis78-3 and L.gmelinii5×L.gmelinii9(Fu Jin),L.kaempferi5×L.gmelinii9,L.gmelinii5×L.gmelinii9,and L.gmelinii10×L.kaempferi13(Lin Kou),L.kaempferi3×L.gmelinii2(Tie Li).According to the volume traits of hybrid larch,the superior families were selected.The same families in the two years were L.kaempferi5×L.gmelinii9,L.kaempferi11×L.gmelinii2 and L.gmelinii7×L.kaempferi77-2(Cuo Hai),L.kaempferi5×L.olgensis78-3 and L.gmelinii5×L.gmelinii9(Fu Jin),L.kaempferi5×L.gmelinii9 and L.gmelinii5×L.gmelinmi9(Lin Kou),Lkaempferi3×L.gmelinii2(Tie Li).According to the tree height traits of 13-year-old hybrid larch,there were 10 high-production and high-stability families in the four test points.They were L.gmelinii5 ×L.gmelinii9,L.kaempferi5 ×L.olgensis78-3,L.kaempferiS ×L.gmelinii9,L.kaempferi5 ×L.olgensis77-3,L.kaempferi11×L.gmelinii2,L.gmelinii6×he6,L.kaempferi12×L.gmelinii9,L.gmelinii10 ×L.kaempferil3,L.gmelinii7×L.kaempferi77-2,and Lolgensis73-18,respectively,which was 2.90%more than the holistic mean.In terms of volume traits of 13-year-old hybrid larch,there were 4 high-production and high-stability families in the four test points.They were L.kaempferil2×L.gmelinii9,L.kaempferi11.L.gmelinii2,L.gmelinii10×L.kaempferi13,and L.kaempferi3B×L.gmelinii9,respectively,which was 11.22%more than the holistic mean.Tree height of 4 year old was significant or significant correlation with height,DBH and volume of other tree age.The DBH of 6 years was significant correlation with DBH of other tree age.The hybrid larch could choose the tree height in the 4 year old,and then choose the DBH in the 6 year old.The early selection was very accurate.The top 5 breeding values of all families in the 4 sites by the tree height traits of 13-year-old hybrid larch were L.kaempferi5 ×L.olgensis78-3,Lgmelinii5×L.gmelinii9,L.kaempferi5×L.grmelinii9,L.kaempferi5×L.holgensis77-3,and L.kaempferi11×L,gmelinii2.The top 5 breeding values of all families in the 4 sites by the DBH traits of 13-year-old hybrid larch were L.kaempferi12 ×L.gmelinii9,L.kaempferi5×L.gmelinii9,Lkaempferi5 ×L.olgensis78-3,Lkaempferi5×L.olgensis77-3,and L.gmeliii5×L.gmelinii9.