Genetic Analysis and Family Selection for Main Traits of Growth and Wood Quality of Chinese Fir

The four main traits of growth( H,D,V) and wood density in 19 year old Chinese fir plantation on 8×8 self diallei crossing were determined and analysed and the index selection were adopted in family selection. The results showed that the four main traits were highly significant,and variances due to GCA were highly significant for all the four traits. The estimated components of GCA variance were more than 75% of all genetic variances,indicating the predominance additive gene actine for these traits. The broad heritability for four traits were 9.97% 41.49%, and for narrow heritability 8.48% 34.20%. The genetic correletion coefficient were highly among three growth traits, and the genetic correletion coefficient were negative weak among three growth traits and wood density. Parent Long 5 and Gao 37 were highly general combiners for three growth traits, and parent Long 5 and Long 1 were highly general combiners for wood density. Six good families were selected by restricted index method with two traits of V and wood density, keeping wood density of good changless to compared with experiment population, V increased 22.97% to experiment population.