High-Generation Chinese Pine Seed Orchard Garden Construction Materials Selection Study

Pinus tabulaeformis is a main timber species in northern China,fast growth,widely distributed,barren drought-resistant and adaptable;it has a very important position in the forestry production.According to the survey data of offspring's height,breast diameter-height and other traits.Through modern breeding Principles and quantitative genetic analysis to do progeny test and genetic parameter estimation;provide theoretical Basis to genetic breeding,at the same time improve the strategy of advanced generation.We analysis the growth and quality characters of 112 Pinus tabulaeformis superior trees of half-sib progeny test forest of Qiaoshan and Shuanglong seed orchard which were built in 1987,use Multi-trait selection breeding choose method and Comprehensive Index Method,we choose 16 superior families.1.Pinus tabulaeformis superior trees have a significant difference between families,it showed that Pinus tabulaeformis has a wide range of variation between half-sib families and has great potential to choose.On the one hand,do a further option in the testing offspring of Pinus tabulaeformis is expected to elect a high productivity family;on the other hand,the type differentiation of trees for future generations choose is still obviously,it shows that a fine phenotype does not mean a fine Genotype,it must through a genetic determination to elect a good genotype family in order to obtain greater efficiency.2.The breast diameter-height,height,volume growth and other traits between the phenotype and genetic-related reached a significant level,genetic correlation coefficient above 0.94.The genetic correlation coefficient growth traits reached a significant or very significant level of growth characters,crown width and adaptability.The phenotype related characters without the adaptability and fecundity are significant or very significant.3.Genetic analysis shows that the heritability of the growth traits,crown width and adaptability were stable;the changing range is 0.48-0.69,shows that the growth of Pinus tabulaeformis is influenced by moderate or severe general control and has a strong families potential choice.Fecundity has a bigger change range,between 0.22-0.51;it shows that the fecundity is mainly affected by environmental factors. 4.Breeding values score method is a simple and better method.Use this method we elected 23 superior families.The height,breast diameter-height,volume growth are 18.29%,40.49%and 74.64%bigger than the control,the genetic gain are 6.69%,14.04%and 33.23%.5.The comprehensive index select is a good method to choose the superior families of better growth and qualities.Established a equal weight-unconstrained comprehensive index equation with 6 traits such as breast diameter-height,height,volume growth,fecundity and adaptability,and take advantage of the comprehensive index equation,the index equation built by the second batch of materials is I₂=0.5703X₁+0.3269X₂+35.9283X₃-0.3001X₄+0.6847X₅+0.1712X₆,which genetic progress,index heritabilty,index accuracy and index efficiency are biggest and best.We choose 23 superior families in growth and qualities.Two methods elect 16 best families.number 20,38,37,46 and 18 of test 1;number 54,2,3,40,11 and 16 of test 2;number 2,51,61,52 and 55 of test 3 were real good family.6.Based on the chosen of superior families,we choose the superior plant in these families and selected 70 superior plants.The height and volume growth are 37.4%and 117.6% bigger than the control,can be used as a high seed orchard production material in seeding Park.7.Proposed multi-generation genetic improvement program of Pinus tabulaeformis and reach three objectives:first of all,obtain maximize short-term and long-term genetic gain. Secondly,obtain a wide range of genetic basis;thirdly,it could flexible improve the stress resistance and fecundity or other traits.