杉木主要经济性状多层次的遗传变异

借助于１０年生的杉木种子－家系两水平试验林，研究了杉木主要经济性状在多层次上的遗传变异规律，其主要结果如下；（１０在相同的研究性状上，通常家系内个体间的变异量〉种源间变异量〉种源内家系间的变异量；性状的遗传个体〉种源内家系〉家系内个体；不同变异层次的遗传改良潜力是不同的；通常种源－家系内个体－种源内家系；多层次联合选择获得最大析选择进展。（２）在相同的变异次上，杉木各研究性状具有各自不同的遗传改奶

Genetic Variations among Multiple Levels in Main Economic Traits of Chinese fir

Genetic variations among multiple levels in main economic traits of Chinese fir had been studied by means of two level plantation of provenance family at 10 year old. The main results are as follows:(1)In the same interested trait,component of variance among individuals within families>that among provenances>that among families within provenances;but heritability of provenances>that of families within provenances>that of individuals among families. Genetic improvement potential at different variation levels is distinct. Improvement potential of provenance>that of individual within families>that of families within provenances,in general. Joint selection of multiple levels will produce the biggest genetic gains. (2)In the same variation level,there are different genetic improvement potentials in different interested traits. Thus,when genetic improvement scheme of Chinese fir will be worked out,appropriate objective should be determined in accordance with different traits.(3)Selecting the good individuals within good families within good provenances,their selective advances of volume,diameter,total height,height under the first living branch are 50.55%,23.39%,17.71%,30.81%,respectively. They are much more bigger than those from the first generation genetic improvement of Chinese fir. So,at present we must pay attention to the second generation genetic improvement of Chinese fir. Both the second generation seed orchard and vegetative propagation are used for utilizing the achievements of genetic breeding and improvement of Chinese fir today.