The progeny testing in seed orchards is a necessary way to promote the upgrading of seed orchards.The genetic variation of the 13-year-old growth characteristics of the half-sib progeny of the second generation clonal seed orchard of Chinese fir was analyzed,which provided basic data for the construction of the third generation seed orchard of Chinese fir.The results showed that there were significant differences in the diameter at breast height(DBH),tree height(H),and volume(V)among families,blocks,and their interaction effects.The family heritabilitis of DBH and V were 0.279 and 0.250,which had the value and potential for conducting selection.The coefficient of variation(CV)of DBH showed that growth was still in the process of continuous differentiation,whether between individuals or families.The average values of DBH,height and volume of 51 families were 17.18cm,12.61m and 0.1592m3,respectively.Comparied with the control,the real gains were 3.56％,2.66％,and 8.00％,respectively.There were 21 families with a real gain exceeding 10％in volume,among which the family with the largest volume achieved a real gain of 31.43％,which was obvious.According to the coefficient of variation of volume and DBH,the comprehensive goodness analysis showed that 24 families,including T71,T78,T122,T152,T106,T114,and T88,had excellent comprehensive performance and could be used as the main candidates for the construction of third-generation clonal seed orchard.
关键词
杉木/2代无性系种子园/子代测定/变异系数/现实增益
Key words
Cunninghamia lanceolata/second generation clonal seed orchard/half-sib progeny test/coefficient of variation/real gain
维普
万方数据