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为了选择优良赤桉抗风家系,对114个40月生赤桉家系进行生长性状树高、胸径、冠幅、单株材积、树皮厚度和无损木材性状Pilodyn值进行测定和遗传分析。结果表明:树高、胸径、单株材积、冠幅、风害等级、Pilodyn值、树皮厚度、保存率等8个研究性状中除胸径间差异为显著差异(p<0.05)外其余性状间差异性极显著(p<0.01)。不同赤桉林木单株存在着较大的差异,表型变异系数超过15%,风害等级变异系数达到77.84%,赤桉家系间性状各性状中家系遗传力均高于单株遗传力,其中树高、胸径、冠幅、单株材积、Pilodyn值和风害等级均受高等强度的遗传控制(遗传力大于0.40)。风害等级遗传、环境、理论表型变异系数最大、单株材积次之。风害等级与树高遗传相关、环境相关、理论表型相关关系中均呈极显著负相关,与材积遗传、环境相关性极显著,与胸径、Pilodyn值遗传相关呈极显著相关性(rp=-0.341,rp=-0.476)。对各性状不同权重系数进行综合评定选择的15个优良家系,再进一步从生长(遗传增益>10%)及抗风性能(遗传增益<-10%)方面选择出3个优良家系为20026、20027、2002。遗传增益分析表明选择的家系生长性状均高于参试家系平均值,而提高了家系的抗风性。
In order to select a good family of Eucalyptus grandiflora resistance, the Pilodyn values of growth traits, height, DBH, crown volume, plant volume, bark thickness and non-destructive wood traits were determined and analyzed for 114 families. The results showed that among the eight traits such as tree height, DBH, single plant volume, crown width, wind damage grade, Pilodyn value, bark thickness, and preservation rate, among the remaining traits except for the significant differences in DBH The difference was significant (p <0.01). The results showed that there were significant differences among different plantations of Eucalyptus globulus, with the phenotypic coefficient of variation exceeding 15% and the coefficient of variation of wind hazard level reaching 77.84%. The heritability of families among the characters of Eucalyptus grandis families was higher than that of single heritability Tree height, DBH, crown width, plant volume, Pilodyn value and wind damage level were all controlled by higher intensity (heritability greater than 0.40). Wind damage level of genetic, environmental, theoretical coefficient of variation of the largest phenotypic, single plant volume followed. There was a significant negative correlation between wind damage level and tree height genetic correlation, environmental correlation and theoretical phenotype correlation, and significant correlation with volume genetic and environmental factors, and significant correlation with DBH and Pilodyn value (rp = -0.341, rp = -0.476). Fifteen excellent families selected by comprehensive evaluation of different weight coefficients of each trait were selected and three excellent families were selected from the aspects of growth (genetic gain> 10%) and wind resistance (genetic gain <-10%) for 20026,20027 , 2002. Genetic gain analysis showed that the selected family growth traits were higher than the average of the test pedigree, and improve the wind resistance of the pedigree.