为了选择优良赤桉抗风家系,对1年生赤桉家系的生长性状和台风风害等级等进行了测定和遗传分析。结果表明:赤桉各家系树高(H)、地径(D)、单株材积(V)、冠幅(CD)、保存率(SR)以及台风风害等级(WD)在林木单株存在着较大的差异,表型变异系数超过11%。除了赤桉地径和材积的区组间差异不显著外,在家系间差异各性状均达极显著水平。除了树高外,赤桉家系间的遗传力均高于单株遗传力,赤桉林木大小的树高、地径和材积性状受高等强度的遗传控制,遗传变异系数GRV以地径最大(33.5%),材积最小(2.8%),而风害等级为17.9%;各家系性状间存在着丰富的遗传变异,具有很强的家系和家系内单株选择潜力。赤桉各生长性状树高、地径、地径以及冠幅相关性很强(p<0.01)同样其遗传相关系数也均超过0.5。风害等级与家系生长性状的遗传相关系数以风害等级与材积最大(0.414),回归方程也表明抗风性与其生长性状关联程度不大,相反林木植株越速生(即材积越大),更易遭受风害。采用遗传主成分分析并结合保存率最终选择出优良家系15个,生长性状均高于家系平均,其中赤桉家系10025、10055、10010平均树高、地径、材积生长性状均高于生产对照DH3229无性系,而且具有较强的抗风性(较低的风害等级)。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(降低风害等级遗传增益),综合分析表明选择的家系适应性比较强(保存率90%以上),生长性状优良。 In order to select the best Eucalyptus sibiricum family, the growth traits and typhoon wind damage grades of one-year-old Eucalyptus grandis families were determined and analyzed. The results showed that the tree height (H), diameter (D), volume of single plant (V), crown width (CD), preservation rate (SR) and typhoon wind damage class (WD) There is a big difference, the phenotypic variation coefficient of more than 11%. Except that there was no significant difference among the groups of Eucalyptus camaldulensis in terms of diameter and volume, all the traits in pedigree reached the extremely significant level. In addition to the tree height, heredity was higher than that of individual heritability. The tree height, diameter and volume traits of Eucalyptus grandis plantation were controlled by high-intensity genetic control. The genetic variation coefficient (GRV) %), The smallest volume (2.8%), and wind damage rating of 17.9%. There is a wealth of genetic variation among the traits in each family, which has a strong potential for selection of individual plants in families and families. The tree height, diameter, diameter and crown width of growth traits of E. grandis were highly correlated (p <0.01), and their genetic correlation coefficients also exceeded 0.5. The genetic correlation coefficient between wind damage level and the growth trait of family had the largest wind damage grade and volume (0.414). The regression equation also showed that the wind resistance had little correlation with the growth traits. On the contrary, the faster the plantation (ie, the larger the volume) Suffer from wind damage. The results showed that the average growth height, diameter and volume growth of 10025,10055,10010 families were higher than that of the production control DH3229 Clones, but also has a strong wind resistance (lower level of wind damage). The analysis of genetic gain showed that the growth traits of selected families were higher than those of the tested families, but the wind resistance of the families was increased (the genetic gain of wind damage grade was reduced). The comprehensive analysis showed that the selected families were more adaptable (the preservation rate was 90% Above), good growth traits.